Large volume and small flows -- CFD Online Discussion Forums

April 18, 2002, 17:41	Large volume and small flows	#1
Astrid Guest Posts: n/a	Hi all, I am trying to solve a case with a large volume with 1 to 10 kg gas inside. The inlet flow is approximately 1e-5 kg/s. The outlet flow and thus the total hold-up is determined by the pressure near the outlet. However, the outlet is located in a region with Mach >1. The problem is that I need large timesteps to get a decent mass balance and to predict the total gas holdup. On the other hand I need small timesteps as the physics near the outlet geometry require small timesteps. Any suggestion or workaround? Maybe the solution is not a CFD-solution. Astrid

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