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March 28, 2008, 07:47 |
Optimal cell sizes
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#1 |
New Member
Anita K.
Join Date: Mar 2009
Posts: 25
Rep Power: 17 |
Hi,
I have problems estimating the refinement of a mesh. Is there any rough rule of thumb? What attributes have to be considered? Greetings, Anita |
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March 28, 2008, 10:09 |
Hello Anita,
Check this for a
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#2 |
Senior Member
Dragos
Join Date: Mar 2009
Posts: 648
Rep Power: 20 |
Hello Anita,
Check this for a grid spacing near the wall: YPlus Calculator. I hope this will be helpful, Dragos |
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March 28, 2008, 11:13 |
Hi,
generally it is a good
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#3 |
Member
Michele Vascellari
Join Date: Mar 2009
Posts: 70
Rep Power: 17 |
Hi,
generally it is a good practice to perform a grid sensitivity analysis. Start with a coarse grid and refine it until the results became independent from the grid size. About the grid spacing near the wall you need to satisfy same value of y+ according with the turbulence model used. A good starting point for y+ is to referring to a simple well-known problem, like i.e. the boundary layer in a flat plane. Here http://geolab.larc.nasa.gov/APPS/YPlus/ a easy calculator of y+ is provided. I hope this will be helpful Michele |
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