Imbalance in transient simulation -- CFD Online Discussion Forums

December 8, 2009, 09:50	Imbalance in transient simulation	#1
Roland R Senior Member Roland Rakos Join Date: Mar 2009 Posts: 131 Rep Power: 17	Hi, While the calculation is running, I always check the mass/energy imbalance and the mass flow at the inlet/outlet. In steady state simulation there is not problem with these, but I don't understand what does the mass imbalance mean in the case of transient simulation. End of every timestep the imbalance is under 0.1% but the mass flow at inlet and outlet are different (for example 0.3kg/s @inflow and 0.35 kg/s @outflow). How is this possible? Regards Roland.R

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