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-   -   definition of u* for y+<10 (http://www.cfd-online.com/Forums/fluent/31567-definition-u-y-10-a.html)

Robert Spall May 29, 2003 11:40

definition of u* for y+<10
 
Does anyone know how Fluent specifies the value of u* in equation 10.5-32 (Fluent 6 user manual) which defines the wall value of the omega boundary condition (k-omega turbulence model)? The only definition I can find in the manual is u*= C_mu**0.25 k**0.5, which is valid in the log layer, but not the viscous sublayer. If that is used then u*->0 as the grid is refined. Perhaps it is defined as sqrt(tau_wall/rho)?


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