star ccm+ · what is starwhat is star-ccm+ ... import meshimport mesh import from: pro-star
TRANSCRIPT
ContentContent
What STAR-CCM+ is Grid generation Physical modeling Solver Post-processing Examples Conclusion
18.3.2009Aerodynamic Design
of Small Commercial Aircraft – training workshop2
What is STAR CCM+What is STAR-CCM+
Parallelized flow solver 2D/3D viscous/inviscid compressible flow problems Unstructured grid Finite volume technique Integrated software environment - form grid generation
to post-processing
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of Small Commercial Aircraft – training workshop3
Surface or geometric importSurface or geometric import
Import surface grid or geometry from .dbs - pro-STAR surface database mesh file i pro STAR cell/vertex shell input file .inp - pro-STAR cell/vertex shell input file .nas - NASTRAN shell file .pat - PATRAN shell filep
.stl - Stereolithography file .igs/.iges - Initial Graphics Exchange Specification file .stp/.step - Standardized Exchange of Product file .x_t/.x_b - Parasolid Transmit file
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of Small Commercial Aircraft – training workshop
Surface meshingSurface meshing
Tools to help prepare the starting surface geometry Surface remesher Surface wrapper Surface wrapper Hole filler, including non-simple holes Edge zipperg pp Automatic and hand based feature curve extraction and editing
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of Small Commercial Aircraft – training workshop5
Volume meshingVolume meshing
Three types of meshing models tetrahedral - tetrahedral cell shape based core mesh polyhedral arbitrary polyhedral cell shape based core mesh polyhedral - arbitrary polyhedral cell shape based core mesh trimmed - trimmed hexahedral cell shape based core mesh
Boundary layer meshing using a prism layer
Fine tune mesh generation with: Volume sources Volume sources Local and global parameter setting
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Volume meshingVolume meshing
Types of meshing models
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of Small Commercial Aircraft – training workshop7
Mesh manipulationMesh manipulation
Transform - scale, translate and rotate Split and combine boundaries and regions, including
t t dautomated interface definition for closed semi-manifold surfaces
C t d l t d f i t f Create, delete and fuse interfaces Fuse internal boundaries
C h di i l h di i l Convert a three-dimensional mesh to two-dimensional Create cell sets
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Import meshImport mesh
Import from: pro-STAR Gridgen Gridgen Fluent Gambit STAR-CD ICEM
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of Small Commercial Aircraft – training workshop9
Physical modelsPhysical models
M ti Motion Moving reference frames, rotational and translational Frozen rotor (multiple reference frame) model Frozen rotor (multiple reference frame) model
Flow and energy Inviscid, laminar and turbulent flow regimes Gas, liquid, solid and porous media modeling Total energy formulation Conjugate heat transfer Conjugate heat transfer Free-surface and Volume of Fluid (VOF) Cavitation Radiator type heat exchanger Fan curve adjusted momentum source fan
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of Small Commercial Aircraft – training workshop10
Physical models turbulencePhysical models - turbulence
Reynolds-Averaged Navier-Stokes Spallart-Allmaras K Epsilon K-Epsilon K-Omega
Large Eddy Simulation Large Eddy Simulation Detached Eddy Simulation Wall Treatments Wall Treatments
Low y+ High y+g y All y+
Prescriptive boundary layer transition
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Boundary conditionsBoundary conditions
Wall Pressure outlet Mass flow inlet Stagnation inlet Velocity inlet FreeStream Symmetry Axis Interface
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SolverSolver
Coupled flow implicit explicit explicit
Coupled energy Segregated flow Segregated flow
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of Small Commercial Aircraft – training workshop13
Post processingPost-processing
On-line visualization Scalar scene Vector scene Vector scene XY plot Streamline
Export results to TECPLOT
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ExamplesExamples
2D airfoil RAE 2822 several types of meshes imported mesh from ICEM imported mesh from ICEM
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ExamplesExamples
3D case: Small commercial aircraft Wind tunnel correction Different configuration Different configuration Drag difference to wind tunnel test ~10%
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ExamplesExamples
3D case: Small commercial aircraft Propeller effect Fan solver Fan solver
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ExamplesExamples
3D case: Axial fan / Turbomachinery Axial fan with contra-rotary blades Full scale model Full scale model Approximately 1'500'000 cells Calculation of fan curve
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ConclusionConclusion
Universal code limited generally by number of licenses Sometimes problems with physical memory requirement
doccurred Some problems with automated meshing
I bl t b d f l i bl ll d Is able to be used for solving problems usually occurred in aerospace
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Thank you for your attentionQuestions?
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