# about boundary layer and turbulence modeling

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 June 25, 2007, 09:19 about boundary layer and turbulence modeling #1 mic Guest   Posts: n/a Hi. I'm coping with this fact: what should be the extent of the extrusion layer ? I mean, i'm using a standard k-e model, with a standard wall function (local Re is high), how much space have i to take in account for the boundary layer ? i thought a 3-layer with a thickness of 0.5(what are these numbers about ? Are maybe referred to the min and max cell lenght of the import geometry?) should be good... Is there a way to calculate easy the boundary layer thickness ? I tried with the method y+ ='friction velocity * wall distance / dynamic viscosity, but i obtain nothing... any ideas ?

 June 25, 2007, 10:08 Re: about boundary layer and turbulence modeling #2 Ben Guest   Posts: n/a 15

 June 25, 2007, 10:17 Re: about boundary layer and turbulence modeling #3 mic Guest   Posts: n/a 15 what ?

 June 25, 2007, 10:55 Re: about boundary layer and turbulence modeling #4 Ben Guest   Posts: n/a furlongs

 June 25, 2007, 10:58 Re: about boundary layer and turbulence modeling #5 mic Guest   Posts: n/a it's a joke or an elegant way to say that i'm asking too much with too little detail ?

 June 25, 2007, 11:13 Re: about boundary layer and turbulence modeling #6 Ben Guest   Posts: n/a it's a bad joke, it is monday after all.....

 June 25, 2007, 11:21 Re: about boundary layer and turbulence modeling #7 mic Guest   Posts: n/a yeah, you're right...

 June 25, 2007, 14:07 Re: about boundary layer and turbulence modeling #8 a Guest   Posts: n/a If you make the the cell reynolds number 1500 you generally get a decent Yplus for wall functions. length is near wall cell height velocity is an estimate of the average free stream velocity

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