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March 11, 2009, 05:55 |
y+ range
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#1 |
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if I use SST without transitonal turbulence is it possible that values are wrong calculated when my y+ ranges from ~0.15 up to ~40?? briefly have I to model a grid with 30 < y+ < 300 w/o tt and 1 < y+ < 5 with tt to avoid wrong calculations? best wishes adam
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March 11, 2009, 22:24 |
Re: y+ range
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#2 |
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Hi,
It is always possible to get wrong results. There are a lot of things to get right before you get an accurate simulation. If your question does SST need 30<y+<30 without the transition model and 1<y+1<5 with it the answer is no and no. The normal SST model is good for pretty much any y+ and the transition model requires y+<1. Regards, Glenn |
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March 12, 2009, 04:44 |
Re: y+ range
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#3 |
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Yes, this was the question. Thanks.
But how to generate efficiently a y+<1 grid? start with one, looking in post for regions y+>1 and then refining them? Or is there a way to precalculate y+ for a given grid?? |
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March 12, 2009, 17:20 |
Re: y+ range
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#4 |
Guest
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Hi,
The manual discusses techniques for estimating necessary grid resolution. Otherwise do a simulation, work out the y+ and refining/coarsening based on the result. Glenn Horrocks |
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