Propeller cavitation with non condensable gas(first constant property then ideal gas) -- CFD Online Discussion Forums

February 9, 2015, 04:47	Propeller cavitation with non condensable gas(first constant property then ideal gas)	#1
CFD-fellow Senior Member Behrooz Jamshidi Join Date: Apr 2013 Posts: 110 Rep Power: 13	Hi Im modeling cavitation on a propeller with a constant volume fraction of air.After a procedure I got converged solution with reasonable results. Now when I change air to ideal gas (with isothermal heat transfer) or define an expression for variable density with the previous run as initial value, I get overflow error on the first time step. B.C:velocity inlet and opening with static pressure. tstep=0.0001 Ive also decreased time step to 10e-9 which didnt help. Decreasing relaxation factors caused overflow happen later(on 6th tstep) Any idea?

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