ACUSIM Software Inc., 2685 Marine Way, Suite 1421, Mountain View, California 94043 Tel: (650) 988-9700 Fax: (650) 988-9770 [email protected] http://www.acusim.com Coupling AcuSolve with MD-Nastran: Fluid Structure Interaction Acusim Software Inc. Proprietary Information Farzin Shakib April 21, 2009
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Coupling AcuSolve with MD-Nastran: Fluid Structure … · AcuSolve is a powerful general purpose CFD code zThe premier commercial finite element based CFD solver
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ACUSIM Software Inc., 2685 Marine Way, Suite 1421, Mountain View, California 94043Tel: (650) 988-9700 Fax: (650) 988-9770 [email protected] http://www.acusim.com
Coupling AcuSolve with
MD-Nastran:
Fluid Structure Interaction
Acusim Software Inc. Proprietary Information
Farzin Shakib April 21, 2009
Page 2
Outline
Product Overview
Fluid Structure Interaction (FSI)Practical FSI: Linear Solid/Structural Analysis
A powerful general-purpose finite element flow solver
AcuSolve’s differentiation:Robustness Most problems solved on the first attemptSpeed Coupled solver on distributed parallel machinesAccuracy Highly accurate in space and time while
globally and locally conservativeFeatures Rich set of functionality; continuously growing
An ideal enabling technology for integrated engineering and scientific applications
Generate mesh from CADAutomatic tet mesherBoundary layer
Full problem specificationGlobal parametersBoundary conditions, etc.
Launch solverMonitor progress
Customizable for easy deployment
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Fluid Structure Interaction
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FSI Technology
Practical FSIModal response of solid/structure given to AcuSolveAcuSolve runs by itself
Fast, easy and robustAccommodates linear solid/structure interactions
Released Q2-2004
Direct-Coupling FSITight coupling of AcuSolve & Solid/Structural Code
Two codes run in tandem Projection & interpolation performed by AcuSolveNo intervening middleware
Released Q2-2007Soon to be released with MD-Nastran OpenFSI
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Practical FSI: Linear Solid/Structural Analysis
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Practical FSI
Step 1: Solid ModelSolve an Eigenvalue problem using Nastran
Step 2: ProjectionProject the Eigenvectors onto the AcuSolve mesh
Built-in tools to extract and project directly from OP2 files
Step 3: Run AcuSolveSolve the transient coupled flow and linear deformationAt each step, AcuSolve
Computes fluid forces on the wet surfaceProjects the forces onto the EigensystemAdvances the modal responseComputes the new mesh positionSolves the fluid and other equations on the deformed mesh
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Advantages & Limitations
Advantages:The fluid and solid codes are run independently and separately
No run time coupling is requiredNo fluid mesh size limitation imposed by FSI
Significantly more stable than alternative approachesEliminates high wave number modes, yields smooth coupling
Very efficientProblem setupCPU time
Limitations:Only linear solid/structural analysis
No material or geometric nonlinearitiesOnly simple contacts
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Wind Turbine Modeling
National Renewable Energy Laboratory (NREL) modelTransient Sliding Mesh Model - Flexible Blades
Total of 20 structural modes were included for this analysis.