Simulation of Fluid-Structure Interactions in Aeronautical Applications€¦ · ·...
Transcript of Simulation of Fluid-Structure Interactions in Aeronautical Applications€¦ · ·...
![Page 1: Simulation of Fluid-Structure Interactions in Aeronautical Applications€¦ · · 2010-08-16Fluid-Structure Interactions in Aeronautical Applications Martin Kuntz Jorge Carregal](https://reader035.fdocuments.in/reader035/viewer/2022062600/5aee82e87f8b9a90319131d0/html5/thumbnails/1.jpg)
December 2003 3rd FENET Annual Industry Meeting Slide 1
Simulation of Fluid-Structure Interactions in Aeronautical Applications
Martin KuntzJorge Carregal FerreiraANSYS GermanyD-83624 [email protected]
![Page 2: Simulation of Fluid-Structure Interactions in Aeronautical Applications€¦ · · 2010-08-16Fluid-Structure Interactions in Aeronautical Applications Martin Kuntz Jorge Carregal](https://reader035.fdocuments.in/reader035/viewer/2022062600/5aee82e87f8b9a90319131d0/html5/thumbnails/2.jpg)
December 2003 3rd FENET Annual Industry Meeting Slide 2
Outline
• Flow Analysis with CFX-5.6– Numerical scheme– Turbulence modeling– Applications
• Structural Analysis with ANSYS– Applications
• Fluid-Structure Interaction with ANSYS / CFX– Multiphysics – Applications
![Page 3: Simulation of Fluid-Structure Interactions in Aeronautical Applications€¦ · · 2010-08-16Fluid-Structure Interactions in Aeronautical Applications Martin Kuntz Jorge Carregal](https://reader035.fdocuments.in/reader035/viewer/2022062600/5aee82e87f8b9a90319131d0/html5/thumbnails/3.jpg)
December 2003 3rd FENET Annual Industry Meeting Slide 3
ANSYS Organisation
ANSYS, Inc.
FluidsMeshingMechanical
CoreTechnologies
CFXICEM-CFDANSYS
IntegrationPlatform ANSYS Workbench
BusinessUnits
![Page 4: Simulation of Fluid-Structure Interactions in Aeronautical Applications€¦ · · 2010-08-16Fluid-Structure Interactions in Aeronautical Applications Martin Kuntz Jorge Carregal](https://reader035.fdocuments.in/reader035/viewer/2022062600/5aee82e87f8b9a90319131d0/html5/thumbnails/4.jpg)
December 2003 3rd FENET Annual Industry Meeting Slide 4
CFX-5 Numerical Method
• Finite volume method for hybrid grids
• Conservative, vertex-based discretization• Implicitly coupling of equations• Rhie/Chow pressure-velocity coupling• Algebraic multigrid• Scalable parallelization• Second order space and time discretization• Suitable for whole range of Mach- and Reynolds
numbers
![Page 5: Simulation of Fluid-Structure Interactions in Aeronautical Applications€¦ · · 2010-08-16Fluid-Structure Interactions in Aeronautical Applications Martin Kuntz Jorge Carregal](https://reader035.fdocuments.in/reader035/viewer/2022062600/5aee82e87f8b9a90319131d0/html5/thumbnails/5.jpg)
December 2003 3rd FENET Annual Industry Meeting Slide 5
CFX-5 Turbulence Modelingk-ε model
SST model
k-ε model
SST model
• Variety of models– For different types of flow– With different
computational effort• Examples
– One-equation models (KE1E)
– Two-equation models (SST, k-eps)
– Reynolds stress models (LLR, SSG)
– DES / LES models
![Page 6: Simulation of Fluid-Structure Interactions in Aeronautical Applications€¦ · · 2010-08-16Fluid-Structure Interactions in Aeronautical Applications Martin Kuntz Jorge Carregal](https://reader035.fdocuments.in/reader035/viewer/2022062600/5aee82e87f8b9a90319131d0/html5/thumbnails/6.jpg)
December 2003 3rd FENET Annual Industry Meeting Slide 6
NACA 4412 Airfoil
![Page 7: Simulation of Fluid-Structure Interactions in Aeronautical Applications€¦ · · 2010-08-16Fluid-Structure Interactions in Aeronautical Applications Martin Kuntz Jorge Carregal](https://reader035.fdocuments.in/reader035/viewer/2022062600/5aee82e87f8b9a90319131d0/html5/thumbnails/7.jpg)
December 2003 3rd FENET Annual Industry Meeting Slide 7
Shear-Stress Transport Model
• Optimized model for flow with separation and adverse pressure gradients
• Zonal model– k-omega model near the wall– k-epsilon model in freestream
• Blending dependent on solution• Additional limiter for turbulent viscosity • Automatic blending between• Wall treatment
– Logarithmic law on coarse grids– Low-Re formulation on fine grids
![Page 8: Simulation of Fluid-Structure Interactions in Aeronautical Applications€¦ · · 2010-08-16Fluid-Structure Interactions in Aeronautical Applications Martin Kuntz Jorge Carregal](https://reader035.fdocuments.in/reader035/viewer/2022062600/5aee82e87f8b9a90319131d0/html5/thumbnails/8.jpg)
December 2003 3rd FENET Annual Industry Meeting Slide 8
Aerodynamic Applications
• DLR F6 Wing/Body/Nacelle/Pylon configuration– Particpation at AIAA drag prediction workshop 2003,
Orlando– Analysis of accuracy and performance of CFD codes – Participants
• Industry: Airbus, Boeing, CESNA• Research centers: NASA; DLR, ONERA, NAL, QinetiQ• Universities
• Two Configurations• Wing / body• Wing / body/
nacelle / pylon
![Page 9: Simulation of Fluid-Structure Interactions in Aeronautical Applications€¦ · · 2010-08-16Fluid-Structure Interactions in Aeronautical Applications Martin Kuntz Jorge Carregal](https://reader035.fdocuments.in/reader035/viewer/2022062600/5aee82e87f8b9a90319131d0/html5/thumbnails/9.jpg)
December 2003 3rd FENET Annual Industry Meeting Slide 9
DLR F6: Lift for Wing Body
• Wing / body Configuration– Medium grid– 5.8 million nodes– ICEM-Hexa
• Excellent agreement for complete range of incident
Angle of Attack [Deg]
Lift
Coe
ffici
ent
![Page 10: Simulation of Fluid-Structure Interactions in Aeronautical Applications€¦ · · 2010-08-16Fluid-Structure Interactions in Aeronautical Applications Martin Kuntz Jorge Carregal](https://reader035.fdocuments.in/reader035/viewer/2022062600/5aee82e87f8b9a90319131d0/html5/thumbnails/10.jpg)
December 2003 3rd FENET Annual Industry Meeting Slide 10
DLR F6: Turbulence Model
NASA Codes CFX 5
CL increased by 0.015 when SST A1 changed from 0.31 to 0.33 (Reduced separation, comparable to S-A turbulence model)
⎥⎦
⎤⎢⎣
⎡Ω
=2
1* ;minF
kakt
ρωραµ
CL increased by 0.015 when SST A1 changed from 0.31 to 0.33 (Reduced separation, comparable to S-A turbulence model)
⎥⎦
⎤⎢⎣
⎡Ω
=2
1* ;minF
kakt
ρωραµ
![Page 11: Simulation of Fluid-Structure Interactions in Aeronautical Applications€¦ · · 2010-08-16Fluid-Structure Interactions in Aeronautical Applications Martin Kuntz Jorge Carregal](https://reader035.fdocuments.in/reader035/viewer/2022062600/5aee82e87f8b9a90319131d0/html5/thumbnails/11.jpg)
December 2003 3rd FENET Annual Industry Meeting Slide 11
DLR F6: Lift vs. Drag
CFX-5
• Design parameter drag• Good agreement with SST model• Constant deviation for Spalart-Almaras model
Lift
Coe
ffici
ent
Drag CoefficientDrag Coefficient
![Page 12: Simulation of Fluid-Structure Interactions in Aeronautical Applications€¦ · · 2010-08-16Fluid-Structure Interactions in Aeronautical Applications Martin Kuntz Jorge Carregal](https://reader035.fdocuments.in/reader035/viewer/2022062600/5aee82e87f8b9a90319131d0/html5/thumbnails/12.jpg)
December 2003 3rd FENET Annual Industry Meeting Slide 12
Computational Performance
• Lift and Drag converged after 120 iterations
• Oscillations in residuals due to transient separation
• Computation time about 12h fort 6 M nodes on 16 processors
![Page 13: Simulation of Fluid-Structure Interactions in Aeronautical Applications€¦ · · 2010-08-16Fluid-Structure Interactions in Aeronautical Applications Martin Kuntz Jorge Carregal](https://reader035.fdocuments.in/reader035/viewer/2022062600/5aee82e87f8b9a90319131d0/html5/thumbnails/13.jpg)
December 2003 3rd FENET Annual Industry Meeting Slide 13
Structural Analysis
• Initial focus on analysis of solids– Structural
analysis, thermal analysis
• Expanding focus to other fields– Multiphysics
environment
Structural
Fluid
Thermal
Electrostatic
Electrical
Magnetic
HFEMAG
![Page 14: Simulation of Fluid-Structure Interactions in Aeronautical Applications€¦ · · 2010-08-16Fluid-Structure Interactions in Aeronautical Applications Martin Kuntz Jorge Carregal](https://reader035.fdocuments.in/reader035/viewer/2022062600/5aee82e87f8b9a90319131d0/html5/thumbnails/14.jpg)
December 2003 3rd FENET Annual Industry Meeting Slide 14
Strategy: Multiphysics
HeatHeatTransferTransfer
SolidSolidMechanicsMechanics
MagnetismMagnetismFluidFluidMechanicsMechanics
ElectricityElectricity
ANSYS MultiPhysics
![Page 15: Simulation of Fluid-Structure Interactions in Aeronautical Applications€¦ · · 2010-08-16Fluid-Structure Interactions in Aeronautical Applications Martin Kuntz Jorge Carregal](https://reader035.fdocuments.in/reader035/viewer/2022062600/5aee82e87f8b9a90319131d0/html5/thumbnails/15.jpg)
December 2003 3rd FENET Annual Industry Meeting Slide 15
Fluid-Structure Interaction
• Simultaneous run of individual software – Using advanced and
validated features of participating codes
– Exchanging data at common boundaries or overlapping domains
• Simultaneous solution of multiple fields in single solver– Non-optimal software
for individual fields– Requirement for
common grid– Large problems
become computationally expensive
⇒ ANSYS / CFX code coupling
![Page 16: Simulation of Fluid-Structure Interactions in Aeronautical Applications€¦ · · 2010-08-16Fluid-Structure Interactions in Aeronautical Applications Martin Kuntz Jorge Carregal](https://reader035.fdocuments.in/reader035/viewer/2022062600/5aee82e87f8b9a90319131d0/html5/thumbnails/16.jpg)
December 2003 3rd FENET Annual Industry Meeting Slide 16
FSI Classification
CFD
Thermal
Structural
ElectromagneticsMultiphysics
One-way Two-way
Explicit ImplicitIterativeCoupling algorithm
VolumeSurfaceInteraction domain
Heat flux Heat source
Mom. source
Pressure Force
Temperature
Velocity
Displacement
Exchange variables
Files MPITransfer medium
![Page 17: Simulation of Fluid-Structure Interactions in Aeronautical Applications€¦ · · 2010-08-16Fluid-Structure Interactions in Aeronautical Applications Martin Kuntz Jorge Carregal](https://reader035.fdocuments.in/reader035/viewer/2022062600/5aee82e87f8b9a90319131d0/html5/thumbnails/17.jpg)
December 2003 3rd FENET Annual Industry Meeting Slide 17
Two-way Coupling
Coef. loop
FSITimeloop
Stagger loop
FSITimeloop
CFX-5solver
ANSYSsolver
![Page 18: Simulation of Fluid-Structure Interactions in Aeronautical Applications€¦ · · 2010-08-16Fluid-Structure Interactions in Aeronautical Applications Martin Kuntz Jorge Carregal](https://reader035.fdocuments.in/reader035/viewer/2022062600/5aee82e87f8b9a90319131d0/html5/thumbnails/18.jpg)
December 2003 3rd FENET Annual Industry Meeting Slide 18
Interaction Domain
• Surface coupling at 2D interface
• Volume coupling at 3D domain
Fluid Solid
StructureElectro-
magneticsFluid
![Page 19: Simulation of Fluid-Structure Interactions in Aeronautical Applications€¦ · · 2010-08-16Fluid-Structure Interactions in Aeronautical Applications Martin Kuntz Jorge Carregal](https://reader035.fdocuments.in/reader035/viewer/2022062600/5aee82e87f8b9a90319131d0/html5/thumbnails/19.jpg)
December 2003 3rd FENET Annual Industry Meeting Slide 19
Data Transfer
• Variables – Variables available in both fields
• Transformation– System of units, scaling
• Interpolation– Dissimilar meshes
• Data transfer media– Files, MpCCI
![Page 20: Simulation of Fluid-Structure Interactions in Aeronautical Applications€¦ · · 2010-08-16Fluid-Structure Interactions in Aeronautical Applications Martin Kuntz Jorge Carregal](https://reader035.fdocuments.in/reader035/viewer/2022062600/5aee82e87f8b9a90319131d0/html5/thumbnails/20.jpg)
December 2003 3rd FENET Annual Industry Meeting Slide 20
FSI Examples
• Gas turbine• Heart valve• Aerofoil flutter
![Page 21: Simulation of Fluid-Structure Interactions in Aeronautical Applications€¦ · · 2010-08-16Fluid-Structure Interactions in Aeronautical Applications Martin Kuntz Jorge Carregal](https://reader035.fdocuments.in/reader035/viewer/2022062600/5aee82e87f8b9a90319131d0/html5/thumbnails/21.jpg)
December 2003 3rd FENET Annual Industry Meeting Slide 21
FSI Application: Gas Turbine
• Gas turbine rotor: 113 blades• Interaction: Structural / thermal / fluid• CFX
– Fluid flow and CHT in blades• ANSYS
– Directly coupled elements – Thermal and structural analysis of blades
![Page 22: Simulation of Fluid-Structure Interactions in Aeronautical Applications€¦ · · 2010-08-16Fluid-Structure Interactions in Aeronautical Applications Martin Kuntz Jorge Carregal](https://reader035.fdocuments.in/reader035/viewer/2022062600/5aee82e87f8b9a90319131d0/html5/thumbnails/22.jpg)
December 2003 3rd FENET Annual Industry Meeting Slide 22
Turbine: CFD
Pressure
Streamlines
Temperature
![Page 23: Simulation of Fluid-Structure Interactions in Aeronautical Applications€¦ · · 2010-08-16Fluid-Structure Interactions in Aeronautical Applications Martin Kuntz Jorge Carregal](https://reader035.fdocuments.in/reader035/viewer/2022062600/5aee82e87f8b9a90319131d0/html5/thumbnails/23.jpg)
December 2003 3rd FENET Annual Industry Meeting Slide 23
Turbine: Thermal/Mechanical
Displacement
Equivalent stress (SEQV)
Temperature
![Page 24: Simulation of Fluid-Structure Interactions in Aeronautical Applications€¦ · · 2010-08-16Fluid-Structure Interactions in Aeronautical Applications Martin Kuntz Jorge Carregal](https://reader035.fdocuments.in/reader035/viewer/2022062600/5aee82e87f8b9a90319131d0/html5/thumbnails/24.jpg)
December 2003 3rd FENET Annual Industry Meeting Slide 24
St Jude Heart Valve
• Popular bi-leaflet design• Coupling CFX-5 and Dynamic Rigid Body
Module• Several re-meshing steps
![Page 25: Simulation of Fluid-Structure Interactions in Aeronautical Applications€¦ · · 2010-08-16Fluid-Structure Interactions in Aeronautical Applications Martin Kuntz Jorge Carregal](https://reader035.fdocuments.in/reader035/viewer/2022062600/5aee82e87f8b9a90319131d0/html5/thumbnails/25.jpg)
December 2003 3rd FENET Annual Industry Meeting Slide 25
St Jude Heart Valve
Static Result Animation
![Page 26: Simulation of Fluid-Structure Interactions in Aeronautical Applications€¦ · · 2010-08-16Fluid-Structure Interactions in Aeronautical Applications Martin Kuntz Jorge Carregal](https://reader035.fdocuments.in/reader035/viewer/2022062600/5aee82e87f8b9a90319131d0/html5/thumbnails/26.jpg)
December 2003 3rd FENET Annual Industry Meeting Slide 26
St Jude Validation
• Valve Angle against time
![Page 27: Simulation of Fluid-Structure Interactions in Aeronautical Applications€¦ · · 2010-08-16Fluid-Structure Interactions in Aeronautical Applications Martin Kuntz Jorge Carregal](https://reader035.fdocuments.in/reader035/viewer/2022062600/5aee82e87f8b9a90319131d0/html5/thumbnails/27.jpg)
December 2003 3rd FENET Annual Industry Meeting Slide 27
Wing Flutter
• AGARD 445.6 testcase• Experimental set-up
described in AGARD Report 765
• Wall-mounted semispanmodel, mahogany
• Wing aspect ratio: 1.6525, quarter-chord sweepback angle 45 deg.
![Page 28: Simulation of Fluid-Structure Interactions in Aeronautical Applications€¦ · · 2010-08-16Fluid-Structure Interactions in Aeronautical Applications Martin Kuntz Jorge Carregal](https://reader035.fdocuments.in/reader035/viewer/2022062600/5aee82e87f8b9a90319131d0/html5/thumbnails/28.jpg)
December 2003 3rd FENET Annual Industry Meeting Slide 28
Wing Flutter
• Test case : Mach number 0.901• CFD grid: 272.600 nodes, CSA grid: 960 nodes• Grid generation ICEM-HEXA
![Page 29: Simulation of Fluid-Structure Interactions in Aeronautical Applications€¦ · · 2010-08-16Fluid-Structure Interactions in Aeronautical Applications Martin Kuntz Jorge Carregal](https://reader035.fdocuments.in/reader035/viewer/2022062600/5aee82e87f8b9a90319131d0/html5/thumbnails/29.jpg)
December 2003 3rd FENET Annual Industry Meeting Slide 29
Summary
• Fluid Structure Interaction software for aerodynamic applications– Accurate prediction of flow field and global
parameters– High performance – Efficient coupling algorithms
• Future– Continuation of validation work– Improvement of usability