FLUENT Fluent Software Trainin Ncct⊙tLD TRN-99-003 One equation Model: Spalart-Allmaras Turbulent viscosity is determined from =P1 /v)+ .v is determined from the modified viscosity transport equation DI pCa SV+al Dy u+pv t oc b2 Generation Diffusion Destruction The additional variables are functions of the modified turbulent viscoSity and velocity gradients C Fluent Inc. 2/20D9 © Fluent Inc. 2/20/01 Fluent Software Training TRN-99-003 u Turbulent viscosity is determined from: u is determined from the modified viscosity transport equation: u The additional variables are functions of the modified turbulent viscosity and velocity gradients. One Equation Model: Spalart-Allmaras ( ) 1 2 2 2 ~ 1 ~ ~ ~ ~ ~ 1 ~ ~ d c f x c x x c S Dt D w w j b j j b n r n r n m rn s r n n r n - ú ú û ù ê ê ë é ÷ ÷ ø ö ç ç è æ ¶ ¶ + ïþ ï ý ü ïî ï í ì ¶ ¶ + ¶ ¶ = + ( ) ( ) ú û ù ê ë é + = 3 1 3 3 / ~ / ~ ~ n n n n n m rn c t n ~ Generation Diffusion Destruction