Meshing and CFD Accuracy - ICM

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Agenda Introduction to finite volume method in FLUENT Impact of mesh quality on <strong>CFD</strong> solutions Impact of cell topology on solution accuracy Impact of mesh resolution Further improvement on spatial accuracy in the FLUENT V6.2 solver 36
Impact of Mesh Resolution General guidelines (1) • It’s important to start with a good surface mesh that resolves large curvature of underlying geometry (e.g., leading edge of an airfoil, A-pillar, side-view mirror, bend) • Determine cell height <strong>and</strong> growth rate such that the resulting mesh resolves the width of shear layers. – At an absolute minimum, 4 - 5 cells across the shear layer are needed. – Remember the FDM adage for the growth rate (“keep it under 1.2”) 37
Page 1 and 2: • Presenter Name Presenter Title
Page 3 and 4: Agenda An overview of the finite-v
Page 5 and 6: Finite-Volume Method in FLUENT (2)
Page 7 and 8: Finite-Volume Method in FLUENT (4)
Page 9 and 10: Case Study: Fully-Developed Laminar
Page 11 and 12: Case Study: Taylor’s Vortex Array
Page 13 and 14: Impact of Mesh Quality (1) • Qual
Page 15 and 16: Case Study: Windshield De-icing •
Page 17 and 18: Agenda Introduction to finite volu
Page 19 and 20: Impact of cell topology on accuracy
Page 21 and 22: Case Study: Recirculating Flow in a
Page 23 and 24: Case Study: Laminar Flow Through a
Page 25 and 26: Case Study: Turbulent Flow Over a 2
Page 27 and 28: Case Study: Turbulent Flow in a Pip
Page 33 and 34: Case Study: Drag on a Sphere (2) Cd
Page 35: Case Study: Windshield De-icing •
Page 39 and 40: Impact of Mesh Resolution General g
Page 41 and 42: Impact of Mesh Resolution A Guideli
Page 43 and 44: The Node-Based Gradient Option •
Page 45 and 46: Case Study: Inviscid Subsonic Flow
Page 47 and 48: Spatial Accuracy Improvements in V6
Page 49 and 50: Example: CD vs. BCD Martinuzzi and
Page 51 and 52: Spatial Accuracy Improvements in V6
Page 53 and 54: Example: Heat Transfer in a Channel
Page 55 and 56: Example : Fully-Developed Pipe Flow
Page 57 and 58: Example: Turbulent Flow Past an Ell
Page 59: Summary • Mesh (still) impacts co

Meshing and CFD Accuracy - ICM

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