Question about convergence

cfd^2 · February 21, 2014, 15:16

Hi,

Please look the picture attached. The momentum residuals does not reach the convergence criteria of 10^-3, but the mass flow rate at the outlet reached the steady state. What could I do in this case? The simulation is transient with dt=0.1s. Single phase flow.

Regards

farzadpourfattah · February 21, 2014, 16:43

at the beginning of run with very small time step use first order for momentum and then change it to second order,you will see that your residual improve.

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February 21, 2014, 16:43		#2
farzadpourfattah Member farzadpourfattah Join Date: Mar 2013 Posts: 41 Rep Power: 14	at the beginning of run with very small time step use first order for momentum and then change it to second order,you will see that your residual improve.