Hi, I want to know what is
 

Hi,

I want to know what is the criterium of convergence for a solver in Fluent which solves something like simpleFoam (incompressible flow).
Because I want to compare Fluent's criterium and my criterium that I used in simpleFoam.

Thanks in advance,

Lam

p.s: and can Fluent accept a model viscosity like BirdCarreau?

The standard convergence crite
 

The standard convergence criteria adopted in FLUENT require that all residuals drop under 10^-3.

In my experience this requirement is not always satisfactory, especially for steady calculations. Usually I just set very low or zero residuals and check when residuals flatten and double-check convergence monitoring some property of the flow.

Yes, that viscosity model should already be implemented in FLUENT.

Regards,
A.

Hi Alberto, Thanks for repl
 

Hi Alberto,

Thanks for replying me.

Do you think that a criterium which is somthing like:
norm[U_(n+1) - U_(n)]/norm[U_(n)] < tol
is wrong for a steady computations?
Otherwise, why this criterium is not implemented?

The residuals in FLUENT are de
 

The residuals in FLUENT are defined as the errors of the discretized equations, i.e., a_P*U_P -{Sum (a_NB*U_NB) + S_U} i the case of U-momentum equation. They are often normalized (or scaled) by the factors of users' choice such as Sum(a_P*U_P}. I guess OPneFOAM uses the same definition.