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
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An Introduction to Recent CFD Technique from CAD to Solver (CATIA-ICEM CFD-CFX 5.7) BeomSeok KIM Department of Mechanical Engineering, Graduate school.
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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 SeminarKorea Maritime University, BUSAN30 July – 01 August, 2004
Procedure of General CFD AnalysisProcedure of General CFD Analysis
3D Modeling
Meshing
Solving
Design
Post-processing
CATIA, Solidworks, Pro-Engineer
Convergence problem?Coarse? – Quality check!!
Rough surface?
Modification?
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 AnalysisProcedure of General CFD Analysis
3D-Modeling for Flow Meter: CATIA V5 R13
Inlet Filter
Casing
Pivot Shaft
Bearing
Shaft Guide
Rotor
Guide Vain
Casing Cover
ICEM-CFDICEM-CFD
• ICEM: Integrated Computational Engineering and Manufacturing
- CFD VersionPre and Post Processor without Load, Constraint and Properties tabs. Includes Prism meshing. Write mesh for 100+ CFD solvers.
• 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
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
• Prism layer • improve boundary layer resolution for
tetrahedral mesh• Hex and Tet zones joined by a pyramid layer
Hybrid Meshing
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
Mesh Generation – Flow Meter
• Rotating Part : 510,000 nodes• Using Hybrid Mesh : Tetra - Prism• Complex Domain : Created by separately
Mesh Generation – Flow Meter
CFX-5.7CFX-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
• 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
Compressor and Scroll
Combined Tet and Hex mesh
Interface Model : Frozen Rotor
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-sectionVelocity 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
Computation Results : Flow Meter
• Calculated Torque at Rotating Blade : 0.0017592N M