Yplus adaptation
Hi,
performing the Yplus adaptation on a wall, and using a standard k-epsilon turbulence model, what should be the value of the Min and Max Allowed in the Yplus/Ystar adaptation window? Thanks |
Re: Yplus adaptation
from FLUENT 6.1 Documentation:
Near-Wall Mesh Guidelines for Wall Functions : A value close to the lower bound (yplus ~=30 ) is most desirable. Although FLUENT employs the linear (laminar) law when , using an excessively fine mesh near the walls should be avoided, because the wall functions cease to be valid in the viscous sublayer. It is important to have at least a few cells inside the boundary layer Near-Wall Mesh Guidelines for the Enhanced Wall Treatment: When the enhanced wall treatment is employed with the intention of resolving the laminar sublayer,yplus at the wall-adjacent cell should be on the order of yplus=1. However, a higher y+ is acceptable as long as it is well inside the viscous sublayer ( yplus<4 to 5). You should have at least 10 cells within the viscosity-affected near-wall region (Rey<200 ) to be able to resolve the mean velocity and turbulent quantities in that region. |
Re: Yplus adaptation
Set it to 30<y+<300.
This is a pretty good range for Wall-functions in general |
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