[fede_freefly]

Hi guys,
I'm studying a flow over an airfoil characterized by 10^6 Reynolds value.
I'd like to ask you something about the Spalart-Almaras model, because I' ve red on the Guide that in FLUENT this model works with an Enhanced wall treatment. If I understood well, this treatment allows you to make a less dense mesh, with a Yplus value higher than 30, modelling in a certain way the viscous and the buffer layers.
Is it correct?
I've made a mesh with a Yplus of 65, cause i need a not so heavy mesh. Could the model work good for this kind of mesh?

Thanks !

[HyperNova]

Hello,
This model works automatically, so based on your y-plus the model works good, for this model y-plus should be under 1 or more than 30 , if y-plus<1 then the enhanced wall treatment will be activated and if y-plus>30 the standard wall function will be activated automatically.
good luck

[fede_freefly]

Originally Posted by HyperNova

Hello,
This model works automatically, so based on your y-plus the model works good, for this model y-plus should be under 1 or more than 30 , if y-plus<1 then the enhanced wall treatment will be activated and if y-plus>30 the standard wall function will be activated automatically.
good luck

Thanks for the answer !
Ok, i've done some simulation with this condition, is it good to apply the ADAPT function on the Yplus, imposing the max value allowed around 3 ?
Do you think the Spalart Almaras would give better results with this correction? or is it unnecessary?
(I' ve done both the simulation with and without the correction, but it seems to give pretty same value of Cl)

[fede_freefly]

Originally Posted by fede_freefly

(I' ve done both the simulation with and without the correction, but it seems to give pretty same value of Cl)

Ok, i should correct myself, i'm having a convergence problem with angle of attack at 10° with the non adapted mesh, still haven't done the tries with an adapted one.

[HyperNova]

hi,
if you want SA model workes as a low reynolds number y-plus around 1 is better, but i think 3 is also ok, good luck