# How to control Minximum mesh space?

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 April 13, 2005, 09:02 How to control Minximum mesh space? #1 hung Guest   Posts: n/a Hi everyone! I'm a beginer in Fluent and Gambit. Now I'm making the external flow over spheroid. But, I cannot control the minximum mesh space at the wall by structured or unstructured. Someone can help me, How to control it? Thanks you in advance. Hung

 April 13, 2005, 15:27 Re: How to control Minximum mesh space? #2 Jason Guest   Posts: n/a Easiest way is using sizing function. Another option is using a boundary layer mesh (but this tends to be a huge problem in 3D). Otherwise, decompose the volume into smaller volumes. Make sure there is at least one edge that protrudes from the spheroid. Control the mesh on this edge and you should control the volume mesh. But this ONLY works in structured meshes! For an unstructured mesh you have to use sizing functions. The unstructured volume mesh algorith is questionable at best if you don't use sizing functions. Hope this helps and good luck, Jason

 April 13, 2005, 21:48 Re: How to control Minximum mesh space? #3 hung Guest   Posts: n/a Thanks Jason! I try to use the sizing function and Tet/Hybrid+Tgrid, But the smallest size cannot be reduced to 1e-4 or 1e-5. Could you advance to me about that! Thanks more! Hung

 April 14, 2005, 06:40 Re: How to control Minximum mesh space? #4 Jason Guest   Posts: n/a What is actually happening when you try to create a mesh that small? Are you getting an error, are you hitting the face mesh limit? How big is your geometry? What were the steps you were performing that didn't allow you to mesh that small? Without getting some more info from you about what you're doing or what's actually going wrong, the only suggestions I can think of are that if you're hitting the 100,000 face element limit, then up that in your defaults. Or if it's because the mesh is too small for the tolerance in Gambit (which is 1e-6), then scale up the geometry and you can scale it back down when you import it into Fluent (Grid->Scale). Jason

 April 15, 2005, 08:50 Re: How to control Minximum mesh space? #5 Hung Guest   Posts: n/a Thanks to Jason! I try to make grid of the Pheroid, which has the lage axis: 1, small axis: 1/6 And the smallest size is 1e-4 or 1e-5. But I cannnot use the sizing function with Start size is 1e-5. So, could you advance to me the way to solve it. Thanks! Hung

 April 18, 2005, 01:39 Re: How to control Minximum mesh space? #7 stone Guest   Posts: n/a use wall function on the boundary

 April 18, 2005, 09:38 Re: How to control Minximum mesh space? #8 Hung Guest   Posts: n/a Thansks to all! I used the multi-domain method around the body. And in each domain, I used the Map or Cooper scheme! Now I try to use Sizing function and Boundary for complex geommetry, hoping your help! Thanks one more! PAH

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