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zuozicheng July 11, 2005 07:29

about Y+ in SST model
hi all

when i make grids in my airplane in order to compute results at Ma=0.2, alpha=8, i use SST model, auto wallfuntion , i posted a computed result and see Y+=30-300,

but the help files say if low Re model(such as SST),Y+=2.0 , in boudarylayers, there must be 10 points, or SST model can also accept wall Function, so i want to know how i set Y+ in SST? would you tell me the true way if you have some idea?

WT July 12, 2005 08:47

Re: about Y+ in SST model
Hi Zuozicheng,

as I understand the manual, the SST model automatically adapts itself whether or not it is using wallfunctions depending on the local Y+, i.e. the grid resolution. So, if you think a small Y+ is beneficial for your simulation, create a grid with a fine boundary layer resolution and CFX will use the SST model without wallfunctions. Otherwise, if the grid is coarser in the boundary layer, wall functions will be applied.



zuozicheng July 12, 2005 10:05

Re: about Y+ in SST model

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