[Saima]

I am analyzing co-rotating disc with structured mesh.

I have started first with steady solver, turbulent and compressible fuid, but it took almost 18000 iteration. The i started transient with time step: 1e-03 s. It worked and converge quickly and better convergence.

Now, doing Mesh study and refined mesh.Now I have started with transient and time-step: 1e-05. But still it is taking longer time. I have attached some results kindly guide me how to tweak parameters?

I've tried some best practices for updating time step. But didn't worked. Now trying "Time-Step Control Models" but seems like it is also not working. I've made of change model after stopping the solution and add in that run.

Thanks in advance.

[Светлана]

It is normal for finer meshes to need a smaller time step and to take a longer time to solve. You may do a time step convergence - try different time step values and compare your results - or evaluate your CFL (Courant number) to know what is the largest time step after which the solver would become unstable.