I am working with pressure based steady aerodynamics of a car. I found that, courant number plays an important role in convergence. In transient study it should not be greater than 1 but in steady-state it is 200 by default in Ansys Fluent. I don't know why. Please suggest.
The answer to your question concerns the basic knowledge of CFD. You need to understand the numerical stability topic for time-dependent problems as well as understand the convergence concept for steady problem.
Have a careful study on some fundamental CFD textbook.
Thanks for your suggestion. I have another question. If y+ is 1-5, will the k-epsilon model work with wall treatment?
Dear @Md Shehab Uddin
Plz note, for tge second question I would say no. For finding reason plz read ny answers on the other threads concerning Y +. Fir first question, what I recommend is starting from lower numbers and trying higher numbers gradually which means ti what extent you are going to weight on later grids based ob former grids that helps you to decrease the computational costs of simulation. So that start from a smaller number and then increase it, keep your eyes ob what would happen in terms of convergence. at some point your simulation will diverge and cosequently the courant number less than this point could suit your simulation.
Regards
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