Aerostructural Optimization with the Component Object Model Technology

Supercomputing Korea 2006

Aerostructural Optimization Aerostructural Optimization with the Component Object Model Technologywith the Component Object Model Technology

Jaehun Lee*, Jang Hyuk KwonJaehun Lee*, Jang Hyuk Kwon

Korea Advanced Institute of Science and Technology

Department of Aerospace Engineering

Aerodynamic Simulation & Design Integration Lab.

2006. 11. 20.2006. 11. 20.

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AERODYNAMIC SIMULATION & DESIGN INTEGRATION Lab.Supercomputing Korea 2006

ContentContent

Background

Objective

Component Object Model

Aerostructural optimization

Discussion & Conclusion

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Background: ModelCenterBackground: ModelCenter

Phoenix Integration Corporation Process integration environment

Easy to integrate programs running in different computers or different OS’.

Optimization tool Design of Experiment tool

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Background: ModelCenterBackground: ModelCenter

Advantage Analysis server: Java, OS independent Convenient to integrate programs running in various operating

systems

Disadvantage Programming environment: Visual Basic Script, Java Script and

etc. Limited optimizer

• DOT: variable Metric, conjugate gradient, sequential linear programming, sequential quadratic programming

• Genetic algorithm

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ObjectiveObjective

To construct the Multidisciplinary Analysis in the FORTRAN environment with ModelCenter

To use the COM technology

To use object-oriented programming in the FORTRAN environment

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Component Object ModelComponent Object Model

Microsoft’s middleware to support component-based distributed computing. OMG(Object Management Group): CORBA (Common Object Req

uest Broker Architecture) Sun: EJB (Enterprise JavaBeans)

A binary standard that defines how objects are created and destroyed and how they interact with each other1)

Different applications from different sources can communicate with each other across process boundaries.

Language independent

1) MSDN online

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Component Object ModelComponent Object Model

Object An object combines different data types and creates a new data

type. Structure in C, derived type in FORTRAN90 FORTRAN

• FORTRAN90 supports the object-oriented programming

• Module procedure: a subroutine defined in a module

• Compaq Visual Fortran and Intel Visual Fortran provide subroutines to support COM such as AUTOALLOCATEINVOKEARGS, AUTOADDARG and AUTOINVOKE. complicate to use

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Component Object Model: MatlabComponent Object Model: Matlab

Actxserver: to create a COM Automation server and return a COM object for the server's default interface

Invoke: to invoke a method on an object or interface Example: to call ModelCenter in Matlab

%To initialize COM client

mc=actxserver(‘ModelCenter.Application’);%To load a modelcenter fileinvoke(mc,’loadModel’,’D:\public_aserver\kflow.pxc’);

%To assign a parameter for KFLOW

invoke(mc,’setvalue’,’Model.kflow.Input.SolverCondition.FlowItermax’,100);

%To run KFLOW

Cl=invoke(mc,’getValue’,’Model.kflow.Output.SolverLog.Cl’);

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Component Object Model: FORTRANComponent Object Model: FORTRAN

To create ModelCenter interfaces with CVF/IVF Fortran Module Wizard

MODULE ModelCenter

…

! Module Procedures

CONTAINS

FUNCTION IModelCenter_getValue($OBJECT, varName, $STATUS)

….

END FUNCTION IModelCenter_getValue

END MODULE

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Component Object Model: FORTRANComponent Object Model: FORTRAN

COM Routine Cominitialize: to initialize the COM library Comcreateobject: to create a COM Automation server and return a COM o

bject

ModelCenter interface IModelCenter_loadModel: to load a model IModelCenter_setValue: to set a value in the model IModelCenter_getValue: to get the value of a variable

INTEGER(4):: status,$status2,model_center

CHARACTER(50)::citer

CALL COMINITIALIZE(status)

CALL COMCREATEOBJECT ('ModelCenter.Application', model_center, status)

CALL IModelCenter_loadModel(model_center,cmodel_center)

CALL IModelCenter_setValue(model_center,'Model.KFLOW.Input.SolverCondition.FlowIterMax',citer,$status2)

flowtime=IModelCenter_getValue(model_center,'Model.KFLOW.Output.CLCDLog.FlowTime',$status2)

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Aerostructural OptimizationAerostructural Optimization

Flow Analysis KFLOW: in-house code, parallelized multiblock structured solver Navier-Stokes equation, Bald-lowmax turbulence model ONERAM6 OS: Linux

Structural Analysis NASTRAN: MacNeal-Schwendler Corporation (MSC) Linear static analysis Skin, spar, rib OS: Windows

Fluid Structure Interaction Analysis Static aeroelastic analysis

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Optimization Design variables

• Aerodynamic: sweepback, upper thickness ratio, lower thickness ratio(3EA)

• Structural: thickness of structural members(12EA) Objective: to find minimum structural weight (estimated by NASTRAN) Constraints

• Aerodynamic:

• Structural: Optimization Algorithm: Sequential Quadratic Programming Language: FORTRAN, Compaq Visual Fortran (CVF)

01/ ,01/ 00 DDLL CCCC

01/ ,01/ 00

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Aerostructural Optimization: KFLOWAerostructural Optimization: KFLOW

(b) Running of KFLOW through ModelCenter(a) Running of KFLOW in Linux

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Optimization Result

Objective CL CD max max

Initial 293.3 0.16234 0.9359E-02 83.7MPa 1.797E-02m

Designed273.2

(-6.9%)0.16235 0.8960E-02 83.6MPa 1.819E-02m

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Discussion & ConclusionDiscussion & Conclusion

Demonstration of the use of COM in FORTRAN Based on the use of commercial programs (CVF, ModelCenter) Object-oriented programming via FORTRAN Application of COM in the aerostructural optimization Alternative approach for integrating programs in the

multidisciplinary analysis

Aerostructural Optimization with the Component Object Model Technology

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