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Turbocharger
Design & Analysis Solutions
Bill Holmes
Brad Hutchinson
Detroit, October 2012
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Agenda
•ANSYS overview
•ANSYS TurboSystem
•Blade row solutions
– The ANSYS
Transformation
methods
•An example:
turbocharger
compressor analysis
•Summary
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ANSYS Vision
for
Rotating
Machinery:
• Full machine simulation
– High fidelity simulation of
all components
– Simulate complex
phenomena and processes• Unsteady combustion,
compressor stall, cavitation,
noise, fracture,
component
interactions, advanced
materials.....
– Integrated tool set for all geometry and physics
– Large scale
High
Performance Computing
(HPC) enabled
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ANSYS TurboSystem
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Turbomachinery @
ANSYS
•Axial and centrifugal compressors
•Axial and radial turbines
(Steam & gas)
•Centrifugal, mixed‐flow
and axial
pumps
•Axial and radial fans
•Automotive
turbomachinery•Water turbines
•Wind turbines
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ANSYS TurboSystem•Complete turbomachinery
design and analysis in
ANSYS Workbench
– Geometry– Throughflow
– Meshing
– CFD
–Thermal
– Combustion
– Structural mechanics
– Rotordynamics
– Post‐processing
– Optimization
This presentation will focus on
ANSYS blade row fluid
dynamics for
turbocharger
compressors
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ANSYS WorkbenchParametric Geometry (Meanline & Through-Flow)
Mesh AnalysisRobust Design
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ANSYS Workbench
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ANSYS Workbench
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ANSYS Workbench
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ANSYS Workbench
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ANSYS Workbench
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ANSYS Workbench
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ANSYS Workbench
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ANSYS Workbench
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ANSYS Workbench
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ANSYS Workbench
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BladeModeler‐
Meanline Design
•Vista CCD
– Centrifugal compressor rotor
design
•Real gas
capability
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BladeModeler – Meanline Design
•Vista RTD
– Radial turbine
preliminary design
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ANSYS BladeModeler
•Design comparison
•Visible in
meridional
sketches, angle/thickness
views, blade‐to‐blade view
and
3D
view
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ANSYS TurboGrid
•Automated grid
generation for bladed
turbomachinery components
•High quality hexahedral grids
•Repeatable– Minimize mesh
influence in design
comparison
•Scalable
– Maintain quality with
mesh refinement
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Centrifugal Compressor
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ANSYS CFD
@
Turbomachinery
• Fast & scalable solver
• Low
speed
to
supersonic• Steady/transient
• Turbo‐specific BC’s
• Turbulence & heat transfer
• Multiple
Frame
of
Reference• Multi‐phase flow
• Real fluids
• Fluid/structure interaction
• …
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SST Model
Laminar‐turbulent transition
Streamline
curvature &
rotation
'Automatic'
wall functions
Stagnation
line flows
EARSM
Wall
roughness
Scale‐
Adaptive
Simulation
Detached
Eddy
Simulation
Turbulence Model
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ANSYS Design
Exploration
• Sensitivity analysis
• Design optimization
• Robustness evaluation
initial
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Mechanical
• Mechanical deformation
– Rotational forces
– Surface pressure
loads
• Thermal stress
– Temperature, Heat flux, …
• Modal analysis
– Frequencies
• Blade flutter
– Aerodynamic damping
• Forced response
– Transient Rotor‐Stator
– Full 2‐way FSI
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ANSYS Transient Blade Row Methods
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TBR with
pitch
change:
The
ANSYS
Transformation
methods
– Problem: How to obtain the full‐wheel transient
solution,
but
at
low
cost?
•Solution: The ANSYS TBR Transformation family of methods
oNew models minimize number of simulated passages,
providing enormous efficiency gains and reduced
infrastructure requirements
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Transient
with Pitch Change
Transient
with Pitch Change
Steady
with Pitch ChangeTransient
Full-Domain
Transient
Full-Domain
Profile
Transformation
Profile
Transformation
Time
Transformation
Time
Transformation
Fourier
Transformation
Fourier
Transformation
Time Domain Status:
Release & Beta
Harmonic
Transformation
Harmonic
Transformation
Frequency Domain
Fast Blade
Row
Solutions
Status:
Development
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ANSYS TBR Applications
Turbine
Gust pitch
Blade Passage pitchGust speed
Gust AnalysisGust Analysis
Turbine
Gust pitch
Blade Passage pitchGust speed
Gust Analysis
Blade FlutterBlade Flutter
PeriodPeriod
d i s p l a c e m e n t
d i s p l a c e m e n t
IBPAIBPA D a m p i n g C o e f .
D a m p i n g C o e f .
Blade Flutter
Period
d i s p l a c e m e n t
102
Nb j j Nb
IBPA
IBPA D a m p i n g C o e f .
TBR Applications
Multi‐StageMulti
‐StageMulti
‐Stage
Single‐Stage
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Trends @ Turbocharging
• Unsteady‐State
– Rotor‐Stator Interaction
(Off ‐Design)
– Inlet distortion
– Acoustics
• Turbulent flow with
conjugate heat transfer
• Multi‐physics
– Forced response
– Thermal
• Optimization & Robust Design
• Map Width Enhancement, mixed flow turbine wheels, volute configuration
ETH Zurich
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ANSYS Workbench
ANSYS Turbo
System
Geometry Mesh Analysis
C A D
Throughflow Robust Design
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Example Application:
Turbocharger
Compressor
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Turbocharger Compressor
Analysis:
A
Best
Practice
Example
•Methodology
•Preliminary Design
•Geometry & Meshing
•Impeller‐
only
analysis•Impeller‐diffuser‐
volute analysis
•Post‐processing
and
interpretation
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Methodology
• Pre‐CFD
– Start with geometry that meets design specifications• From
Vista
CCD,
CCM,
TF
and
BladeModeler
• Impeller‐only analysis
– The impeller is the heart of the compression system ‐‐‐
understand it first
– Overall performance:
how
good
can
it
be,
can
it
be
better?
– Nature of the flow, strengths and weaknesses
– What factors affect performance? Predictions?
• Whole system
– Impeller‐diffuser
‐volute
analysis
– Volute‐only analysis ‐‐‐ useful?
• Post‐processing
– Quantitative and qualitative
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Geometry
• 1‐D design developed in VISTA CCD
– Based on prescribed duty, design constraints
• Impeller Geometry
– VISTA CCD, CCM BladeModeler VISTA TF
– Make adjustments according to package constraints, design rules, approach etc.
• Meridional path
• Blade profile/thickness
• Hub/backface
• Tip clearance
• Volute Geometry
– Spreadsheet based
design
• Mass + angular momentum conservation approach (free vortex)
• Drives a parameterized DesignModeler geometry
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Compressor Design
Requirements
Parameter Value
Diameter 48 [mm]
Number of Vanes 6 + 6
Inlet Temperature 288 [K]
Inlet Pressure 101.35
[kPa]
Mass Flow Rate 0.12 [kg/s]
Pressure Ratio 2.15
Tip Speed 391
[m/s]
Shaft Speed 155,733 [rev min^‐1]
•High Specific Flow
impeller with
vaneless
diffuser of radius ratio
1.7
•Typical for
a gasoline
engine with capacity of
1.6L.
•Mid map
operating
point
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Initial Sizing
•Vista CCD used to create a geometry from design
requirements
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Vista CCD:
Output
•Iterate in CCD to achieve acceptable preliminary
design
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Vista CCM:
Input
•Vista CCM used to create a preliminary compressor
map
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Vista CCM:
Output
•Turbocharger compressor is typically operating at
off design
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Initial Geometry
Creation
•VISTA TF requires a geometry: from BladeModeler
– Push‐button
solution
from
Vista
CCD
Compressor Shroud Section
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Initial Geometry
Creation
Compressor Hub Section
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Vista TF:
2D
Analysis
•Vista TF is a throughflow (streamline curvature) solver
– Used to provide further insight into design
– Contour plots show circumferentially averaged
quantities
– 2D Charts show various design parameters such as
loading, incidence
and
deviation
•Based on results, geometry can be quickly modified and
analyzed again
–Blade and flowpath design improved
– Can be parametric and optimization can be
performed
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Vista
TF:
Qualitative
OutputTangential
velocitySolution
error
Meridional
velocity
Static
pressure
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Vista TF
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Final Impeller
Design
•Final impeller geometry steps prior to meshing
– Direct
to
TurboGrid
for
hex– Create fluid flow path for tet meshing
•Volute geometry is generated to match impeller
– Details later
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Final Geometries
Impeller and vaneless diffuser Volute
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Meshing
• Impeller Mesh
– Use a hexahedral mesh: TurboGrid ATM
– Pay attention
to:
• Target mesh size
• Balance
• Boundary layer resolution
• Y+• Tip clearance
• Aspect ratio
• Volute mesh
• ANSYS meshing
– Tets + prisms for boundary layer resolution
– Local mesh refinement near tongue
– Match diffuser outlet/volute inlet spanwise mesh distribution
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Impeller‐only
Analysis
• Impeller + part of vaneless diffuser
– How much of the vaneless space to model?
• Grid refinement
study
– Grid: The biggest factor affecting predictions
– Tetrahedral Elements Vs. Hexahedral Elements
– Understand
the
effect
of
grid
size
on
prediction• Target: “working grid” size with Y+=2
• Ideally, double/half the grid size in each direction– 1/8X, 1X, 8X working grid size
• Estimate of grid independent‐solution
– Effect of
fillets
– Look at key points on the map• Nominal design, near surge line, near choke, choke
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Example: Mesh
Independence
Study
•Impeller + Vaneless Diffuser Analyzed at 155, 733 rpm
•Three operating
points
– Design Flow Rate
– Near Choke
– Near Stall/Surge
•Compared Hex mesh vs. Tet mesh
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Mesh Summary
# of
Nodes
Blade
Y+
Meshing
Tool
Meshing
Method
Meshing
Time
Mesh
File Size
Max Vol
Ratio
Max Length
Ratio
0.142m 8 TurboGrid ATM 1 min 3.67MB 159 2132
1.12m 4 TurboGrid ATM 1 min 34.8MB 88 4308
8.58m 2 TurboGrid ATM 3 min 273MB 34 3547
# of
Nodes
Blade
Y+
Meshing
Tool
Meshing
Method
Meshing
Time
Mesh
File Size
Min
Angle
Min
Quality
0.143m 8 ICEM CFD Octree ~5 min 56.7MB 0.65 0.01
1.08m 4 ICEM CFD Octree ~30 min 601MB 0.31 0.0029
7.50m 2 ICEM CFD Octree ~1.5 hr 4.4GB 0.23 1.3e‐06
Hexahedral
Tetrahedral
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Hex Coarse
Mesh
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Hex Medium
Mesh
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Hex Fine
Mesh
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Tet Coarse
Mesh
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Tet Medium
Mesh
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Tet Fine
Mesh
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Mesh Independence: Hex vs. Tet
Total PressureTet mesh
at
approximately 8 million
nodes still is not as
accurate as Hex mesh at
125 thousand nodes!
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Mesh Independence: Hex vs. Tet
Isentropic Efficiency
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Mesh Sensitivity:
Hex
speedline
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Mesh Sensitivity:
Fine
Tet
speedline
added
Tet mesh at
approximately 8 million
nodes still is not as
accurate as Hex mesh at
125 thousand nodes!
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Effect of
Fillet
•1.5 mm fillet included
at main and splitter
blade root
– compared to blade
geometry without
fillet
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Fillet Study:
Effect
on
Pressure
Ratio
Difference only
apparent at/near
choke
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Fillet Study:
Effect
on
Isentropic
Efficiency
Difference only
apparent at/near
choke
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Assembly Analysis
• How much do I really need to model, and using what methods?
– Impeller‐diffuser‐volute?
– Volute only (including part of vaneless diffuser)?
• Inlet specified from exit of impeller‐only analysis
– Steady state, transient?
• We did
the
following,
for
comparison
purposes:
– “Frozen rotor” ‐‐‐ full 360 degrees
– “Stage” analysis ‐‐‐ one impeller with full volute
– Transient Rotor Stator ‐‐‐ full 360 degrees
– Volute only
• Constant Pt, Tt, flow direction
• As above but with a spanwise profile
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Volute Mesh
•Relatively Coarse Mesh
used for Study
•Size:
370,000 nodes
– Tet Elements = 1.1
million
– Prism Elements = 0.32
million•Quality Statistics
– Average Element Quality = 0.71
– Min Element
Quality
=
0.046
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Effects of
Diffuser
and
Volute
•Comparison of three different configurations
– Impeller Only
(Single
Passage)
– Impeller + Vaneless Diffuser (Single Passage)
– Impeller + Vaneless Diffuser + Volute (Full 360,
frozen rotor)
•Compare speedlines
– 155,733 rpm
– Pt ratio = (Pt outlet/Pt inlet)
– Isentropic Efficiency
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Pressure ratio
predictions
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Isentropic efficiency
predictions
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Impeller Behavior
•Now look at impeller only performance in two
configurations
– Impeller‐only simulation
– Impeller‐diffuser‐volute simulation
•Speedlines shows Impeller behaves similarly
regardless of downstream geometry
– Pt ratio = (Pt impeller outlet/Pt impeller inlet)
– Isentropic Efficiency for impeller only
•Significant value in examining individual components
to gain insight
Impeller pressure ratio predictions for two
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Impeller pressure ratio predictions for two
configurations
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Isentropic efficiency
predictions
for
two
configurations
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Effect of
rotating
‐stationary
frame
interface
type
•Comparison of three interface types between diffuser
and
volute– Stage (single passage impeller/diffuser, full volute)
– Frozen rotor (full 360 degrees)
– Transient Rotor
Stator
•For all cases
– Impeller + vaneless diffuser modeled in rotating
frame
– Volute modeled in stationary frame
Effect of interface type on total pressure
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Effect of interface type on total pressure
prediction
Effect of interface type on isentropic efficiency
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Effect of interface type on isentropic efficiency
prediction
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Post Processing
• Before starting:
– Make sure solutions are converged!
• Run with
a big
enough
time
step!
• Quantitative
– Impeller• Pt, Tt, Abs. flow angle, isentropic efficiency
• Distortion factor
• Blade loading
– Volute: recovery factor, loss coefficient
– Estimate grid‐independent solution
• Qualitative– Blade‐to‐blade and meridional averaged
– Unrolled plot at exit of impeller
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CFD Results
•Examine results from Compressor Report in CFD Post
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CFD Results
•Or use table generation tool in CFD Post to extract
custom
information
at
various
streamwise
locations
Blade Loading Chart near choke
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Mass flow
= 0.13
kg/s
Relative Mach Number near choke
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Mass flow
= 0.13
kg/s
Relative Velocity near choke
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Mass flow
= 0.13
kg/s
Meridional velocity near choke
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Mass Flow
= 0.13
kg/s
Static pressure near choke
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Mass flow
= 0.13
kg/s
Relative Mach Number near choke
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Mass flow
= 0.13
kg/s
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Summary
• ANSYS offers complete turbomachinery
design and analysis software
– Geometry
– Throughflow
– Meshing
– CFD
– Thermal
– Combustion
– Structural mechanics
– Rotordynamics
– Post‐processing
– Optimization