1. An Introduction to Recent CFD Technique from CAD to Solver (CATIA-ICEM CFD-CFX 5.7) BeomSeok KIM Department of Mechanical Engineering, Graduate school of Korea Maritime University The 2004 KIT-KNCT-KMU Lab. Joint Seminar Korea Maritime University, BUSAN 30 July – 01 August, 2004

2. Procedure of General CFD Analysis 3D Modeling Meshing Solving Design Post-processing CATIA, Solidworks, Pro- Engineer Convergence problem? Coarse? – Quality check!! Rough surface? Modification?

3. 3D Modeling CATIA, Solidworks, Pro-Engineer etc. Meshing ICEM-CFD 5.0, Grid Pro, Hyper Mesh etc. Solving CFX-5.7, CFX-TASCflow, Fluent, Star-CD etc. Post-processing AVS, Ensight, Field View, Amira etc. Procedure of General CFD Analysis

4. 3D-Modeling for Flow Meter : CATIA V5 R13 Inlet Filter Casing Pivot Shaft Bearing Shaft Guide Rotor Guide Vain Casing Cover

5. ICEM-CFD ICEM: Integrated Computational Engineering and Manufacturing - CFD Version Pre and Post Processor without Load, Constraint and Properties tabs. Includes Prism meshing. Write mesh for 100+ CFD solvers. - FSI Combination of FEA and CFD features Modernized and Integrated GUI Wide CAD support Mid-Plane Extractions/Extensions Geometry Creation/Repair/Simplification Ref. : The 2004 International ANSYS Conference, Pittsburg, USA

6. Powerful Meshing tools Tetra from CAD, CAD and mesh, or mesh Shell meshing, patch dependent, patch independent, mapped, structured/unstructured Hex-dominant, unstructured hexa, structured hexa, extruded quads Advanced mesh editing Hexa Meshing Structured/Unstructured Boundary Conditions Output to 100+ Solvers Post processing Scriptable … and much more…

7. I-DEAS SolidWorks Pro/Engineer Unigraphics Solid Edge CATIA 3 rd Party Cad IGES ACIS Parasolid DWG/DXF GEMS Faceted Data STL VRML NASTRAN, PATRAN, ANSYS, LS- DYNA Wide CAD Support

8. Tetra Meshing Automatic Surface and Volume Meshing Patch Independent Surface mesh not required to generate volume mesh Surface mesh can be saved independently Very tolerant of imperfect geometry

9. Tetra Meshing Most commercial Tet mesh generators First generate a Tri surface mesh surface-by-surface Every edge of every surface must be resolved sensitive to sliver surfaces, bad surface parameterization surface connectivity (gaps) If the surface mesh is complete volume mesh is generated from surface mesh Mesh detail

10. Tetra Meshing ICEM Tetra uses patch-independent, Octree method Volume mesh generated independent of surface model Mesh is projected to model surfaces, curves and points Surface mesh is created Resulting mesh is independent of the underlying arrangement of surfaces Sliver ignored

11. Hexa Meshing High-powered hexahedral grid generation Top-down or Bottom-up blocking approach Allows rapid creation of complex topologies Fast Iteration Cycle Elastic blocking can be fit to schematically similar geometry Replay Files for parametric geometry changes

12. Prism layer improve boundary layer resolution for tetrahedral mesh Hex and Tet zones joined by a pyramid layer Hybrid Meshing

13. Mesh Generation – Flow Meter Inletpipe : 140,000 nodes Outpipe : 100,000 nodes Using Hybrid Mesh : Tetra - Prism Complex Domain : Created by separately Inletpipe Outpipe Prism Layer

14. Mesh Generation – Flow Meter Rotating Part : 510,000 nodes Using Hybrid Mesh : Tetra - Prism Complex Domain : Created by separately

15. Mesh Generation – Flow Meter

16. CFX-5.7 Advanced coupled multigrid linear solver technology Unmatched meshing flexibility Superb parallel efficiency Excellent pre and post-processing capabilities A wide range of physical models that interoperate with each other providing real answers to industrial problems - Multiphase Flows - Bubbly Flows - Free Surface Flows - Particle Tracking - Mass Transfer : Cavitation, Boiling, Condensation, Evaporation Ref. :http://www.cfxkorea.com

17. Boundary Conditions – Flow Meter Inlet : 0.4444kg/sec. Outlet : Pressure (Averaged at Whole Surface) GGI Grid Surface matching : Frozen Rotor Rotating : 800 rpm

18. Grid Interface  = = Non overlap regions are created if interface sides do not fit perfectly (this should be avoided where possible) Completely overlapping integration point faces Partly non-overlapping integration point faces Complete non-overlapping integration point faces Slip walls are used at non-overlapping regions Ref. :CFX-5.7 Basic Training Course, CFX-Korea

19. Compressor and Scroll Combined Tet and Hex mesh Interface Model : Frozen Rotor

20. Computation Results : Flow Meter 720,000 node Hybrid Mesh Steady State/Frozen Rotor RNG-KE/Water at 25 Rotating Speed: 800RPM Mass Flow-rate: 0.444kg/s Velocity vector at mid-section Velocity vector at mid-section 3-D Clipping View 3-D Clipping View Velocity vector at inlet pipe Velocity vector at inlet pipe Velocity vector at out pipe Velocity vector at out pipe

21. Computation Results : Flow Meter Calculated Torque at Rotating Blade : 0.0017592N M Streamlines Streamlines Surface pressure Surface pressure

22. Computation Results : Butterfly Valve Computational Mesh Computational Mesh 98,000 nodes Hybrid Mesh : Tetra-Prism RNG-KE/Steady State Approaching Velocity : 3m/s Water at 25 Inlet Outlet Symmetry

23. Computation Results : Butterfly Valve Pipe Length : 2m Diameter : 0.4m Axis Symmetric Flow Field Open Angle : 45 deg. Isometric View Isometric View Surface Pressure Surface Pressure

24. Computation Results : Butterfly Valve Stream Lines behind Valve Plate Stream Lines behind Valve Plate Stream Lines from Inlet to Outlet Stream Lines from Inlet to Outlet Velocity Vector Velocity Vector Surface Pressure Surface Pressure Calculated Torque at V/V Plate : 30.4568 N M