BRIEF REPORT ON EIGHTH ASIA-PACIFIC … VIII_ Report_28jan2014 (3).pdfChairman, Dr. S...

APCWE-VIII Report 10-14 December 2013, CSIR-SERC, Chennai, India of 23

BRIEF REPORT ON EIGHTH ASIA-PACIFIC CONFERENCE ON WIND

ENGINEERING (APCWE-VIII)

The Eighth Asia-Pacific Conference on Wind Engineering (APCWE-VIII) was successfully

organised by CSIR-Structural Engineering Research Centre (SERC) at Chennai during 10th to

14th December 2013, in association with International Association for Wind Engineering

(IAWE), Indian National Academy of Engineering (INAE) and Indian Society for Wind

Engineering (ISWE), under the Chairmanship of Prof. Nagesh R. Iyer, Director, CSIR-

SERC. The conference has its legacy starting with the first event held at Roorkee/India

(1985), moving to Beijing/China (1989), Hong Kong/China (1993), Gold Coast/Australia

(1997), Tokyo/Japan (2001), Seoul/Korea (2005) and Taipei/Taiwan (2009). The conference

is convened every four years and CSIR-SERC had the privilege of hosting the event in India

after 28 years. The Patron of the conference was Prof. Samir K. Brahmachari, Director

General, CSIR, and Secretary, DSIR, Government of India.

The conference was attended by wind engineering researchers and practitioners from around

Asia and Pacific regions. The conference provided interaction among the participants which

is essential for identifying and conducting need-based and relevant-based R&D and providing

cost-effective solutions to challenging and complex industrial problems/environmental

problems to meet the requirements of the society. By and large, the following professionals

were benefited by the conference;

• Wind engineers and computational fluid dynamics application engineers

• Engineers in construction and power plant industries and in wind energy sector

• Wind disaster management and policy makers

• Personnel involved in formulation of guidelines for codes of practice

• Researchers in atmospheric sciences and application engineers

• Instrumentation technologists for health monitoring of full-scale structures

This report gives complete details about the conference, covering all the aspects from the

Committees formed for organising the conference, major events to the conference activities,

etc. The international scientific advisory board of the conference had experts in the field of

wind engineering. The members include:

Acir M Loredo-Souza, Brazil

Ahsan Kareem, USA

Alpa Sheth, India

S K Bhattacharyya, India

Chang-Koon Choi, Korea

Chii-Ming Cheng, Taiwan

Chris Letchford, USA

Chris P W Geurts, Netherlands

Claudio Borri, Italy

Dorothy A Reed, USA

T K Datta, India

Emil Simiu, USA


Andrzej Flaga, Poland

Gautam Biswas, India

Giovanni Solari, Italy

Hamid Yaghoubi, Iran

John D Holmes, Australia

Kenny C S Kwok, Australia

N Lakshmanan, India

Leighton Cochran, USA

Mark Serling, UK

Masaru Matsumoto, Japan

Kishor C Mehta, USA

Michael Kasperski, Germany

Ming Gu, China

Nagesh R Iyer, India

R N Nayak, India

H J Niemann, Germany

R Panneer Selvam, USA

Partha Sarkar, USA

Peter C King, Canada

P D Porey, India

Prem Krishna, India

Richard Flay, New Zealand

Rudiger Hoffer, Germany

Sergey Georgirvich Kuznetsov, Ukraine

P Seshu, India

Shuyang Cao, China

Ted Stathopoulos, Canada

William H Melbourne, Australia

Yaojun Ge, China

Yukio Tamura, Japan

The Local Organising Committee had Prof. Nagesh R. Iyer, Director, CSIR-SERC as

Chairman, Dr. S Gomathinayagam, Executive Director, Centre for Wind Energy and

Technology as Co-chairman, Prof. K. Ravisankar (CSIR-SERC) as Technical Secretary and

Shri C. Jeyabal (CSIR-SERC) as Administrative Secretary. The members include:

A Abraham, CSIR-SERC

Achal Mittal, ISWE/CBRI

Antony Jeyasehar, Annamalai University

P Chellapandi, IGCAR

Devdas Menon, IIT Madras

D V Giri, IWTMA

P Harikrishna, CSIR-SERC

K P Jaya, Anna University

K Jayasankar, UltraTech

Kamal Poddar, IIT Kanpur

S Arunachalam, JAL

T S Krishnamoorthy, CSIR-SERC

Lakshmy Parameswaran, CSIR-CRRI

S S Mani, BHEL

K Muthumani, CSIR-SERC

G S Palani, CSIR-SERC

P Paramasivam, NUS

K M Parammasivam, MIT

R Radhakrishnan, ICI

Y E A Raj, IMD

J Rajasankar, CSIR-SERC

G Ramesh Babu, CSIR-SERC

S Selvi Rajan, CSIR-SERC

B Sivarama Sarma, L&T Construction

S Thiagarajan, Fichtner

U S P Verma, NPCIL


Meeting of Local Organising Committee was held at regular intervals to discuss the action

plans in detail and obtain suggestions/work out strategies towards better planning for smooth

conduct of the conference.

CALL FOR PAPERS

The fliers and announcement brochures (Figure 1) were prepared and widely distributed

during international wind engineering conferences/events like 13th International conference

on wind engineering (ICWE) held at Amsterdam in 2011, 7th International colloquium on

bluff body aerodynamics & applications (BBAA7) held at Shanghai, China in 2012 and

national events like Sixth National conference on wind engineering (NCWE) held at New

Delhi, India in 2012. Also, announcement brochures had been sent to all major academic

institutions and industries all over the world. Further, posters (A3 size) about the conference

had been displayed in the notice boards of the academic institutions. The conference website

http://apcwe8.serc.res.in/ hosted all the announcements and updates.

Towards better visibility, brief details of the conference along with a link to the conference

website were displayed in IAWE and ISWE websites. Requests have been sent to Editors of

International Journals in the field of civil and structural engineering, mechanical engineering

and aerospace engineering to display these details in the journal websites. Similar

information was also added to the events column of Journal of Wind Engineering and

Industrial Aerodynamics, the official journal of IAWE as well as other international journals.

FLIER FIRST ANNOUNCEMENT


SECOND ANNOUNCEMENT FINAL ANNOUNCEMENT

Figure 1 Flier and Announcement Brochures

The deadlines pertaining to the submission of 4-page extended abstracts / full length papers

were:

Submission of 4-page extended abstract : 31st May 2013

Notification of acceptance of abstract : 14th June 2013

Submission of full-length paper : 30th August 2013

Early bird registration Deadline : 13th September 2013

Registration Deadline for publication : 21st October 2013

The mode of submission of 4-page extended abstracts / full length papers was online through

MyReview system, the online link for which was made available in the conference website.

A total of 198 numbers of 4-page extended abstracts were received from 16 countries.

REVIEW PROCESS

Every 4-page extended abstract was subjected to an extensive peer-review, by one Indian

expert and one International expert in wind engineering. A total of 125 reviewers were

engaged in the process of reviewing. Out of 125 reviewers, 69 reviewers were from India and

55 reviewers were from abroad. Few of the reviewers are members of editorial board of the

International journal of Wind Engineering and Industrial Aerodynamics and other refereed

journals.


The reviewers’ comments were communicated to the authors along with the status of

acceptance of the abstracts. The authors were then asked to submit revised 4-page extended

abstract and full-length paper after incorporating the suggestions/comments of the reviewers.

PUBLICATION

A total of 161 technical papers, grouped under 13 technical themes were finally accepted for

publication, out of 198 technical papers received. The papers were grouped under thirteen

conference themes which included

1. Boundary Layer Wind Tunnel (BLWT)

2. Bluff Body Aerodynamics (BBA)

3. Low and High Rise Building (LHB)

4. Aeroelasticity and Wind Structure Interaction (AE & WSI)

5. Wind Energy (WEg)

6. Field Measurement & Structural Health Monitoring (FMHM)

7. Bridge Aerodynamics (BA)

8. Computational Fluid Dynamics (CFD)

9. Wind Disaster Mitigation (WDM)

10. Urban Flow Dispersion Modelling and Wind Environment &Human

Comfort (UFDM & WEn)

11. Atmospheric Modelling (AM)

12. Codes of Practice (CoP)

13. Wind Climate Assessment & Climatic Modelling (WCA & CM)

The 4-page extended abstracts were published in hard copy form in Proceedings (cover page

shown in Figure 2) and the full-length papers were published in soft copy form in credit card

flash drive (shown in Figure 3).

(rear) (front)

Figure 2 Proceedings of the Eighth Asia-Pacific Conference on Wind Engineering


Figure 3 E- Proceedings of the conference in credit card flash drive

A Program Booklet containing detailed technical schedule was prepared and distributed to all

the participants. A souvenir (cover page shown in Figure 4) containing Messages for the

conference from eminent personalities and a Directory of wind tunnel facilities in India was

also brought out.

(rear) (front)

Figure 4 Souvenir cover page

front

rear


CONFERENCE

10th December 2013

The conference was conducted at Hotel Green Park, Chennai. The ice-breaking session on

10th December 2013 at 17:00 hours IST involved informal introduction and interaction

among delegates. Simultaneously, the participants registered themselves for the conference at

the Registration desk (Figure 5). Every delegate was assigned with a unique Delegate ID

(DID), with specific codes assigned for each category of delegates. The country code was

affixed to the DID. The various categories included:

(a) KS – Keynote Speaker

(b) IS – Invited Speaker

(c) DA – Delegate Author

(d) DP – Delegate Participant

(e) SF – Students under Financial Subsidy

(f) SK – International Student

(g) SF – Indian Student

(h) LC – Local Organising Committee Member

In totality, there were 292 registered participants, including 124 students representing 16

countries. There was a good representation from the industry as well. The conference kit

given to the delegates included a bag, conference proceedings (print form), program booklet

(print form), souvenir (print form), e-proceedings (credit card flash drive), note pad, pen,

CSIR-SERC annual report (CD form) and CSIR-SERC achievement CD.

Figure 5 Participants at registration desk


11th December 2013

INAUGURAL FUNCTION

The conference was inaugurated by the Chief Guest, Honourable Member, National Disaster

Mitigation Authority (NDMA) Shri Bhattacharjee in traditional manner by lighting the lamp

(Figure 6) at 09:00 hours IST. Prof. Nagesh R. Iyer, Chairman, APCWE-VIII welcomed the

participants and media personnel and briefed the gathering about the significance of the

conference. He also emphasised the fact that the world is focussing “Wind” for harnessing

the energy as well as mitigating the effects of cyclonic wind storms and other extreme wind

events. Honourable Member, NDMA, Shri Bhattacharjee delivered the inaugural address,

wherein he mentioned about the role of modern technology in providing early warning

systems during cyclones, which could greatly facilitate in reducing loss of human lives. He

also stated the fact that cyclone shelters constructucted along the coastal regions had saved

lives of lakhs of people even during recent cyclone “Phailin” in India.

The inaugural function had Prof. Yukio Tamura, President, International Association for

Wind Engineering (IAWE) and Prof. Prem Krishna, Founder President, Indian Society for

Wind Engineering (ISWE) and Vice-President, Indian National Academy of Engineering

(INAE) as guests of honour. Prof. Yukio Tamura briefed about vaiours activities in the field

of wind engineering at international level, while Prof. Prem Krishna discussed about the Past,

Present and Future of Wind Engineering. Finally, the conference proceedings was released by

the Chief Guest (Figure 7)

Figure 6 Chief Guest, Honourable Member NDMA Shri Bhattacharjee lighting the lamp


Figure 7 Release of Conference Proceedings

PLENARY AND TECHNICAL SESSIONS

There were 12 Keynote presentations and 4 invited presentations by experts in the field of

wind engineering from all over the world, spread across 11th December 2013 to 13th

December 2013. The Keynote and Invited presentations were scheduled in the forenoon as

Plenary Sessions, while presentations of contributory papers were scheduled in the afternoon

as Technical Sessions. Each of the Plenary and Technical session was chaired by two eminent

researchers from Wind Engineering fraternity. Detailed schedule of technical sessions along

with details of Chairs is presented in Annexure-A. Further, in each technical session, two

rapporteurs were present, who were a part of the group to recommend papers those could be

considered for publication in the Journal of Structural Engineering and Journal of Wind and

Engineering. The group provided a list of 26 papers for consideration by the expert

committee for finalisation.

The inaugural function was followed by first Plenary Session at 10:30 hours IST, which had

three Keynote presentations by experts.

Title: Aerodynamic and response characteristics of super-tall

buildings with various configurations

Speaker: Prof. Yukio Tamura, Japan


Title: Aerodynamics of atypical footbridges

Speaker: Prof. Andrzej Flaga, Poland

Title: Contemporary wind engineering studies in India

Speaker: Prof. Nagesh R. Iyer, India

The Plenary Session was followed by Sponsors presentations by M/s Larsen and Toubro and

M/s Measurement Specialties Inc, USA at 12:30 hours IST.

The technical sessions in the afternoon began at 14:00 hours IST, in which contributory

papers under 13 conference themes listed earlier were presented. To accommodate large

number of contributory papers, five parallel sessions were conducted, with each of the five

sessions featuring different conference themes listed below:

(i) Boundary Layer Wind Tunnel (BLWT)

(ii) Aeroelasticity and Wind Structure Interaction (AE & WSI)

(iii) Bridge Aerodynamics (BA)

(iv) Computational Fluid Dynamics (CFD)

(v) Low and High Rise Building (LHB)

In the post-tea technical sessions at 16:00 hours IST, papers under the following themes were

presented in five parallel sessions.

(i) Boundary Layer Wind Tunnel (BLWT)

(ii) Aeroelasticity and Wind Structure Interaction (AE & WSI)

(iii) Bridge Aerodynamics (BA)

(iv) Urban Flow Dispersion Modelling and Wind Environment & Human Comfort

(UFDM & WEn)


20 YEAR CELEBRATION OF INDIAN SOCIETY FOR WIND ENGINEERING

The Indian Society for Wind Engineering (ISWE), founded in 1993 by Prof. Prem Krishna

completed 20 years in 2013. A celebration in this regard was organised by ISWE, after


technical sessions, at 18:30 hours IST. During the celebration, M. Tech Thesis Award for the

academic years 2010-2011, 2011-2012 and 2012-2013 were distributed to the awardees.

ISWE conferred Honorary Fellow Award and Life Time Achievement Award during the

event. ISWE Honorary Fellow Award was given to Prof. Yukio Tamura, President,

International Association for Wind Engineering (IAWE) and Prof. Kishor C. Mehta Director,

Hazard Mitigation and Structural Engineering Program, National Science Foundation, USA.

Life Time Achievement Award in Wind Engineering in India was awarded to Prof. Prem

Krishna, Founder President, Indian Society for Wind Engineering and Vice-President, Indian

National Academy of Engineering (INAE) and Dr. N. Lakshmanan, former Director and

Project Advisor, CSIR-SERC, and Former President, ISWE. The past Presidents, past

Secretaries and present Executive Committee members were also honoured by ISWE.

CULTURAL PROGRAM

A cultural program was organised at 19:30 hours IST, which followed 20 year celebration of

ISWE. The cultural program featured Bharata Natyam, a classical dance form of Tamil Nadu.

The cultural program was followed by Conference Banquet dinner.

12th December 2013

The program on 12th December 2013 began at 09:00 hours IST, with the second Plenary

Session, which had Keynote presentations by three eminent speakers listed below:

Title: Cyclone disaster mitigation in cities

Speaker: Prof. Kishor C. Mehta, USA

Title: Simplified analytical model for across-wind response of

chimneys around critical wind velocity regions

Speaker: Dr. N. Lakshmanan, India

Title: Full-scale wind engineering measurements in New Zealand

Speaker: Prof. Richard G.J. Flay, New Zealand


The third Plenary Session at 11:15 hours IST, had Invited presentations by four speakers

listed below:

Title: Cyclone disaster mitigation efforts by CSIR-SERC towards

engineering of non-engineered and semi-engineered dwellings

Speaker: Dr. P. Harikrishna, India

Title: Gust wind speeds for design of structures

Speaker: Dr. John Ginger, Australia

Title: The fundamentals of building internal pressure dynamics

induced through a dominant opening

Speaker: Prof. Rajnish N Sharma, New Zealand

Title: Performance of light-frame structures subject to extreme

wind loads

Speaker: Prof. Vijaya (VJ) Gopu, USA

The Plenary Sessions were followed by Sponsors presentations by M/s Centre for Wind

Energy and Technology (C-WET), Chennai.

In the five parallel technical sessions of contributory papers in the afternoon at 14:00 hours

IST, papers under the following themes were presented

(i) Bluff Body Aerodynamics (BBA)

(ii) Wind Energy (WEg)

(iii) Wind Disaster Mitigation (WDM)




The five parallel technical sessions, post-tea at 15:50 hours IST, featured papers in the

following themes

(i) Low and High Rise Building (LHB)


(iii) Wind Disaster Mitigation (WDM)


(v) Field Measurement & Structural Health Monitoring (FMHM)

REGIONAL MEETING OF IAWE

After technical sessions on 12th December 2013, a closed group regional meeting of IAWE

was conducted at 18:00 hours IST. Specific members of IAWE were invited for the meeting

to select the organiser and venue of Ninth Asia-Pacific conference on wind engineering.

13th December 2013

The program on 13th December 2013 had fourth and fifth Plenary Sessions at 09:00 hours IST

and 11:20 hours IST, with three speakers in each Plenary Session.

Speakers of fourth Plenary Session

Title: Advances in wind tunnel simulation, techniques and tools for

assessing extreme-wind hazard to structures

Speaker: Prof. Partha P. Sarkar, USA

Title: Wind loading and response of structures in mixed climates

Speaker: Prof. Giovanni Solari, Italy

Title: Wind power: the way-forward in India

Speaker: Dr. S. Gomathinayagam, India


Speakers of fifth Plenary Session

Title: Development of critical load cases simulating the effect of

downbursts and tornados on transmission line structures

Speaker: Prof. Ashraf El Damatty, Canada

Title: Advanced physical and numerical modeling of Atmospheric

Boundary Layer and their applications

Speaker: Prof. Shuyang Cao, China

Title: Design of cyclone shelters based on wind tunnel studies

Speaker: Dr. S. Selvi Rajan, India

The five parallel technical sessions of contributory papers at 14:00 hours IST covered the

following themes:

(i) Atmospheric Modelling (AM)


(iii) Codes of Practice (CoP)

(iv) Bluff Body Aerodynamics (BBA)

(v) Wind Climate Assessment & Climatic Modelling (WCA & CM)

TECHNICAL SUMMATION

All the technical sessions were highly interactive. All the queries posed by the audience were

suitably answered by the presenting author. Discussion slips were issued to the delegates in

technical sessions, to collect queries and suggestions from the delegates/experts for the

speaker.

Out of 161 contributory papers, around 136 papers have been presented in the conference in

25 technical sessions. The main reason for the reduced number of presentations is the

inability of the authors to attend the conference. The distribution of the number of papers

presented under 13 conference themes are shown in Figure 8. The number of papers in each

theme is also indicated in the figure. Further, the number of papers presented from various


countries (excluding India) is shown in Figure 9. From India, seventy (70) papers were

presented, whereas from abroad a total of sixty six (66) papers were presented.

Figure 8 Distribution of the number of papers presented under various conference themes

Figure 9 Distribution of the number of papers presented from various countries (abroad)

More contributory papers were presented under the themes of Low and high Rise Buildings

(LHB) followed by Computational Fluid Dynamics (CFD) and Wind Energy (WEg).

Nonetheless, Boundary Layer Wind Tunnel Testing (BLWT) and Wind Disaster Mitigation

(WDM) themes also attracted good number of research papers. Some of the key research

topics currently studied all over the world by the wind engineering fraternity in accordance

with the conference themes have been listed, which will aid in opening up new challenges

and provide better insights into revisiting current problems.

12

9

14

9

4

18

5

23

7

12

17

2

4

0

5

10

15

20

25 Number of papers presented

4

2

13

2

4

2

19

7

1 1

45

1 1

0

5

10

15

20Number of papers presented


Low and high Rise Buildings (LHB)

(i) Analytical models for across wind response in tall buildings and chimneys

Numerous approximations have been made at various stages of analytical modelling of across

wind response in case of tall buildings chimneys have led to variations in response prediction

using the models. Despite a number of models developed based on wind tunnel and full-scale

experiments, even the recent research studies show scatter in the prediction of response of

structures subjected to vortex excitation. Improved analytical models need to be developed,

as well as simplified to be recommended in the Codes of Practice.

(ii) Rational estimate of peak factor in non-Gaussian wind conditions

Wide band nature of pressure fluctuations or non-Gaussianity in certain flow regions around

low to medium rise structures cause heavy tailed, negatively skewed probability distributions.

Peak factors in such scenarios tend to be overestimated by the traditional formulae and a

more rational estimate of peak factor, which could better treat the softening process, will be

required for future applications.

(iii) Multi-hazard scenario in tall buildings

Quantifying the risk assessment of a tall building due to multi-hazard scenario is considered

as grey area of research, since it depends on many parameters. Systematic detailed

experimental or analytical studies to develop design guidelines are needed in order to

understand the complexity/uncertainty involved in the design of tall building which are

exposed due to multiple hazard.

(iv) Active/ semi-active control strategies to control response of tall building

Active / semi-active control mechanisms in suppressing the vibrations which are introduced

in tall buildings due to lateral loads are being studied through analytically/numerically and

experimentally, at laboratory level. Full-scale application of these control strategies to actual

structures will lead to validating analytical/simulation procedures, verifying the complex

systems under actual loading conditions and its capabilities.

Computational Fluid Dynamics (CFD)

(i) Numerical modelling of extreme wind effects

Numerical modelling of extreme wind events like microburst, downburst / tornadoes has till

date been a challenging task, with exceptionally limited knowledge about the actual

characteristics of such events near the ground. Attempts have been made all over the world to

numerically simulate thunderstorm downbursts, wherein unsteady jet flows with various

characteristics have been simulated. The deeper understanding of the modified boundary

layer characteristics during extreme wind events, as opposed to extreme wind events is

becoming the need of the hour.


(ii) Wake aerodynamics of wind turbines / buildings and structures

Simulation of aerodynamics of structures, especially in the wake region has been a grand

challenge problem in Computational Fluid Dynamics, even till date. With turbulence

modelling being the key challenge in applicability of CFD to practical problems, improved

turbulence models for complex flow scenarios is to be pursued for making the tool more

reliable. Especially in wind turbines, the accurate prediction of wake can aid in greater extent

to improve power generation.

(iii) Inflow turbulence generation for various terrain categories for Large Eddy Simulation

Large Eddy Simulation (LES) in CFD requires accurate modelling of the inflow turbulence,

in order to ensure obtaining more accurate results. Generation of more realistic vortices and

compliance of the generated turbulence spectrum with the expected/required turbulent

spectrum needs to be ensured for improved accuracy of LES in Computational Wind

Engineering problems, especially for building aerodynamic studies.

Wind Energy (WEg)

(i) Micro siting of wind turbines in wind farms

With the size of wind farms increasing drastically, the wakes tend to get bigger, leading to a

highly complex flow situation. Micro siting of wind turbines, in order to minimise the effect

of growing wake on the adjacent wind turbine depends up on many parameters such as local

topography, wind conditions and diameter of rotor, etc. Even though some guidelines are

available for micro siting of wind turbines in plain terrain and complex terrain based on

computational or numerical methods, usage of wind tunnel for micro siting needs to be

further investigated.

(ii) Improvisation of performance efficiency of wind turbines

Wind energy being the talk of the day, improvisation of performance efficiency of small and

medium size wind turbines are being attempted by many researchers in many ways.

Systematic wind tunnel investigations / CFD studies under desired turbulence levels will lead

to improve rotational efficiency and increased power production.

(iii) Energy harvesting from aero-elastic instabilities

Recently, researchers had attempted in converting the aero-elastic instabilities (galloping

instabilities introduced in the device due to very low wind speed) into electrical energy via

electromagnetism and used for electronic/electrical devices which consumes minimum

current/voltage. Detailed studies are required to understand the concept in order to make use

of aero-elastic instabilities of buildings/structures into power production and storing it.


Wind Disaster Mitigation (WDM)

(i) Modelling windborne debris during extreme winds

Flying debris during extreme wind conditions are leading to loss of life and damaging

neighbouring structures, as they are carried away in the wind. Few analytical/numerical

studies have been carried out in order to understand the characteristics of debris during strong

winds. Detailed studies to develop design guidelines are needed in order to mitigate the

impact force on building façade with glass panels.

(ii) Physical simulation of extreme wind effects

Physical simulation of extreme wind effects on models of low-rise buildings has been coming

up using mechanical devices in order to understand the phenomenon which takes place

around the building model. Detailed studies are needed in order to understand the interaction

between wind and structure during strong winds and to derive the methods to mitigate the

damage level due to such effects on medium-rise and high-rise buildings.

(iii) Vortex spoilers in structures and in vehicles

The role of provision of vortex spoilers is to minimize the cross wind effects in case of

buildings and increase the performance efficiency in case of vehicles. In the recent past, the

application of vortex spoilers has been extended to bridge decks and wind turbine blades.

(iv) Mitigation of vibrations of cables in cable-stayed bridges

Low damping and very close modes of vibration makes the cables in cable-stayed bridges

highly susceptible to large vibration. Dampers installed near the anchorages have to be

designed by considering the non-linearities in these damping devices, in order to optimally

utilise the potential of dampers in controlling the vibrations.

Boundary Layer Wind Tunnel Testing (BLWT)

(i) Assessment of snow loads on structures in specially designed snow wind tunnels

Snow loads on membrane type structures have been one of the major loads that are to be

considered for the design of structures, in addition to wind loads. Specialised snow wind

tunnels (low wind speed)/climatic wind tunnels are being envisaged in order to assess the

combined action of snow and wind on structures.

(ii) Specialised terrain simulation (hilly terrain)

Simulation of wind characteristics (wind speed, turbulence intensity profiles and wind

direction) for hilly terrain using boundary layer wind tunnel is still a challenging task for

researchers in the field of wind engineering, due to scaling effect, roughness of the model of

hills, and measuring devices.


(iii) Particle Image Velocimetry and Laser Doppler measurement studies in boundary layer

wind tunnel

Application of Particle Image Velocimetry (PIV) and Laser Doppler Velocimetry studies in

boundary layer wind tunnels for complex flow situations like turbulent flow around structures

to get pressure fields, vortex identification and coherent structures needs further improvement

in terms of accuracy, resolution, applicability to larger dimension objects, etc.

Aeroelasticity and Wind-Structure Interaction (AE & WSI)

Analytical and experimental fluid structure interaction studies on large horizontal axis wind

turbines and special structures / complex lighting poles and antennas

Evaluation of loads and its responses of structures like wind turbine support towers, wind

turbine blades, on-shore steel jacket platforms, lighting poles, etc, has been emphasised

through wind tunnel investigations / CFD – FEA coupled simulation. Detailed studies to

develop design guidelines for fatigue life of these structures are needed in order to avoid

damage.

Bridge Aerodynamics (BA)

(i) Rain-wind induced vibration of stay cables

Cable stayed bridge have outnumbered other types of bridges for medium to long span

bridges in the past few decades, in which serviceability issues involving vibrations of large

amplitudes under combined rain and wind action have been observed. Detailed studies to

develop design guidelines are needed in order to fully understand and mitigate the excessive

vibrations.

(ii) Uncertainties in FE Models of bridge response

Modal analysis and response prediction of bridges, carried out using Finite Element Analysis

(FEA) towards design of bridges have inherent structural uncertainties in terms of beam-

column joints, load and mass simulation, etc, in addition to highly turbulent wind conditions.

These uncertainties need to be quantified and corrected, before application of the technique to

practical bridge engineering problems.

Field Measurement & Structural Health Monitoring (FMHM)

(i) Wireless sensor network for online health monitoring from response

Field measurement of wind and associated response of life-line structures such as long span

cable stayed bridges, tall buildings, TV towers, monuments/heritage buildings are being

picking up worldwide by instrumenting with hundreds of wireless sensors of various types at

different locations under on-line mode is to understand its performance during extreme wind

conditions and to find the ways to mitigate the damage. Methodology for selection/placing

the sensors at appropriate location in network form and transmission and handling of huge

data base of wind and its associated response needs further improvement.


(ii) Model identification techniques of full-scale structures

Different techniques in extracting the model parameters from the response sources are being

adopted for vertical structures viz tall buildings, TV tower, etc, for lateral loading.

Methodology to identify the model parameters from minimum response sources for large

scale structures needs further investigation.

Codes of Practice (CoP)

Wind effects on roof mounted PV and solar panels

With modern day emphasis on renewable energy sources for power generation, photovoltaic

and solar panels are being extensively used, for which the design loads are not available in

the International codes of practice for wind loads. Systematic wind tunnel investigations will

lead to rational design guidelines for such roof mounted/ground based PV and solar panels,

either in individual or when in an array.

Urban Flow Dispersion Modelling and Wind Environment & Human Comfort (UFDM

& WEn)

(i) Building ventilation studies and thermal effects

Towards energy efficient design of buildings, the maximum utilisation of natural ventilation

is sought of in recent times. The effect of natural flow around buildings in the indoor air

quality/environment in complex urban environment, where the surrounding buildings cause a

greater influence, needs to be systematically studied. These studies would aid in creating

sustainable building environment.

(ii) Analytical studies on pollutant dispersion to study pollutant concentrations in urban

environment

Air pollution causes serious environmental threat, with faster industrial growth. Human

comfort is greatly affected due to pollutants that are carried with the wind. Analytical models

that predict the pollutant concentration in urban environment/cities need to be envisaged.

Upon validation of the results from these models, more stringent control norms can be put

into practice.

VALEDICTORY FUNCTION

The technical sessions were followed by the official valedictory function of the conference.

The Chief Guest of the valedictory function was Prof. Kishor C. Mehta Director, Hazard

Mitigation and Structural Engineering Program, National Science Foundation, USA. In the

valedictory address, he emphasised three key aspects, viz, “resilience, adaptability and

sustainability” to be considered by young researchers in their future as these three

parameters would lead to better environment. Prof. Nagesh R. Iyer, Chairman, APCWE-

VIII, briefed about the intense knowledge sharing that took place during the conference,


giving it a completely new dimension. He also mentioned that every presentation was being

assessed for probable publication in the Journal of Wind Energy as well as Journal of

Structural Engineering. This was a unique initiative taken by the organisers of APCWE-VIII.

He congratulated the organisers for the successful conduct of the event.

Figure 10 Prof. Kishor C. Mehta delivering valedictory address

A few delegates were invited to express their impressions about the conference. The

delegates who spoke expressed their appreciation for the smooth and successful conduct of

the conference and congratulated each member of the CSIR-SERC staff involved in

organising an event of this magnitude. Prof. Kishor C. Mehta, Chief Guest of the Valedictory

Function, requested all the delegates to give standing ovation for the organisers for

conducting the international event in an excellent way.

Figure 11 Prof. Flaga Andrzej from Poland expressing his impressions about the conference


These delegates representing abroad and India expressed that they thoroughly enjoyed the

technical deliberations during the conference and hospitality extended by the conference

organisers. There was a special mention about the accommodation arrangements made by the

organisers for delegates.

EXHIBITION STALLS

The exclusive sponsors’ sessions, were well received by all the participants. The exhibition

stalls (Figure 12) by M/s Measurement Specialties, M/s LaVision, M/s Centre for Wind

Energy and Technology, M/s State Bank of India, Academy of Scientific and Innovative

Research (AcSIR) and CSIR-Structural Engineering Research Centre put up at the conference

venue received overwhelming response.

Figure 12 Exhibition stalls at the conference venue

14th December 2013

POST CONFERENCE TOUR

A post conference tour to Dakshina Chitra and Mahabalipuram was organised for the

delegates of the conference at no additional cost. Dakshina Chitra is a centre for the living

traditions of art, folk, performing arts, craft and architecture of India with an emphasis on the

traditions of South India. Mahabalipuram is an ancient historic town, which displays a group

of sanctuaries, carved out of rock in the 7th and 8th centuries. It includes rathas (temples in

the form of chariots), mandapas (cave sanctuaries), giant open-air reliefs, and the Shore

Temple, with thousands of sculptures. It has been classified as a UNESCO World Heritage

Site. Figure 13 shows photographs of delegates enjoying the tour.

http://en.wikipedia.org/wiki/Ratha

http://en.wikipedia.org/wiki/Mandapa

http://en.wikipedia.org/wiki/Relief

http://en.wikipedia.org/wiki/Shore_Temple

http://en.wikipedia.org/wiki/Shore_Temple

http://en.wikipedia.org/wiki/World_Heritage_Site

http://en.wikipedia.org/wiki/World_Heritage_Site


Figure 13 Delegates enjoying the post conference tour

SUMMARY

This document is a brief report on the Eight Asia-Pacific Conference on Wind Engineering

organised by CSIR-Structural Engineering Research Centre (SERC) at Chennai during 10th to

14th December 2013, in association with International Association for Wind Engineering

(IAWE), Indian National Academy of Engineering (INAE) and Indian Society for Wind

Engineering (ISWE). The document provides a glimpse of the event, covering all major

aspects. Based on the papers presented in the conference and technical

discussions/deliberations, few key areas of research have been identified and listed, which

would further open up new frontiers in wind engineering research.

BRIEF REPORT ON EIGHTH ASIA-PACIFIC … VIII_ Report_28jan2014 (3).pdfChairman, Dr. S...

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