"Fluid flowing through a rectangular duct, with a rectangular vortex" On what condition can I get an unsteady flow? I have got a steady flow.

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N.C. Markatos

Although I do not quite understand the question,run the code in the unsteady mode and see whether it reaches a steady-state or not.Alternatively use unsteady inlet conditions.

Biplab Das

thank you sir for your valuable suggestions. First step i have all ready done, i.e., running the code in unsteady mode, and checked that it is reached steady-state condition.

But while running in steady mode, in some of the specific condition, solution is not converging.

Can you please suggest me some help/tips to identify the unsteady inlet condition.

Please specify specific condition for which solution is not convergng

Increase relaxation for non-converging cases