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December 29, 2009, 16:19 |
Cd of a truck in a wind tunnel
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#1 |
New Member
Xavi
Join Date: Dec 2009
Posts: 1
Rep Power: 0 |
Hi guys,
First of all thank you. I am studying the Cd of a truck in a wind tunnel (Ignoring the effect of the wheels). BC: 1. speed of 80 km / h 2. Grid adaption to the y + (50 <y+ <500) 3. Moving Ground (case in relative motion format) ----------------------- GAMBIT & FLUENT 1. I subtracted the geometry of the truck, to get a single volume (this procedure is correct?) 2.I entire volume meshing (Scheme Elements: Tet / Hybrid, Type: TGrid, Spacing: 30 (interval count), Total elements: 339862) My question : 1. Need to create a finer mesh underneath the truck? if so, can I do in Gambit? (I've tried different ways but I failed meshing this area). 2. How do I know which is more correct meshing for these situations and what should be the number of elements to this mesh? 3. I have to create a BL in all walls of the truck? or with the option to "use grid adaption to the y + variable" is enough? 4. How would the distribution grid? Thanks again, |
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