false time step implementation for steady state
Convergence for the steady state simulations can be obtained by decreasing the 'false time step'.
Keeping the default RMS convergence criteria (10^-4) for the steady state simululation, convergence in my simulation became difficult to achieve after a while and hence I changed the 'Timescale Factor' from 1 to 0.01 [in the pannel Solver Control -> Basic Settings -> Convergence Control ->Fluid Timescale Control].
It resulted in decreasing the auto time scale from 2*10^-2 to 2*10^-4 and I achieved the convergence.
I do not have a understanding of how the steady solver works (using a 'false' time step)? Could you please help me in understanding the affect/effect of high/low false time step on the accuracy of results.
And what convergence criteria should I use for the problems like cyclone?
With very kind regards, Kushagra
Re: false time step implementation for steady stat
How timestepping works is described in the documentation.
As for what convergence criteria you need, that is problem dependant and you should do a sensitivity study to check it. There is also a guide on convergence levels in the documentation.
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