Adjusting physical time step -- CFD Online Discussion Forums

December 14, 2017, 18:47	Adjusting physical time step	#1
vortex69 New Member Ali Join Date: Apr 2016 Location: Germany Posts: 25 Rep Power: 10	Hello, I am doing a porous medium simulation in CFX and I have a convergence problem, in which I have to give very small time steps , so that my simulation does not diverge. However I want to give very small time steps for the beginning and the make it larger , so that the simulation runs faster. But I do not know how to do that. Should I use expressions ?

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