I am doing Large eddy simulation in ansys fluent. Currently i am using unstructured mesh, so the grid size to compute the CFL number is not fixed, Is it necessary that the solution to be converged within the given max iterations per time step?
Yes, you need that each time step is resolved accurately but that does not depends on the max number of iteration but on the magnitude of the residuals you need to decrease up to a suitable threshold
Filippo Maria Denaro Thank you for your reply. So I need to decrease the time step size or change the under relaxation factor. I gave the magnitude of the residual is 0.001 should i decrease this magnitude.
That depends also on the initial residual, that should be normalized
The short answer is yes. In a transient simulation, the values at the end of each time step is used as the initial value for the next time step. Therefore, if you don't get a converged solution at each time step, your initial value for the consecutive time step is not correct.
Besides checking the normalised residuals, you can also monitor the quantity of interest to check convergence.
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