question about unsteady run and swirl number -- CFD Online Discussion Forums

March 9, 2011, 02:49	question about unsteady run and swirl number	#1
a_cucen Member Ahmet Join Date: Mar 2011 Location: Ankara/ Turkey Posts: 37 Rep Power: 15	i have a case about unsteady flow. mesh has approximately 750.000 cells. but i don' t know what the time step must be? how can i calculate the time step? What is the relation between time step and cells. and second question: how can i calculate swirl number; i found that SN= G_theta/R.G_x. but i could not find how to calculate G_theta and G_x. best regards, Ahmet.

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