real gas simulation in ejector for supersonic flow

rahul_bhad1 · February 19, 2010, 05:04

I were doing simulation of real gas for supersonic ejector. But, the following message is appearing while starting the iterations.

Error: REFPROP_error (202) from function: tprho (density)
[TPRHO error 202] liquid iteration has not converged for T = NaN K, P = 0.20000E-01 MPa, rho (last guess) = NaN mol/L, compositions = 1.00000
Error Object: ()

The boundary conditions are given as follows -
pri. flow inlet - pressure inlet 400600 Pa, total temp. 78 C
sec. flow inlet - pressure inlet 39990 Pa, total temp.8 C
pressure outlet - pressure outlet 40000 Pa, backflow total temp. 35 C.
Real gas used is R141b.
Can anyone help me?

amjadfirst · March 31, 2015, 21:12

I had that happen to me a few times under different conditions. Changing the mesh could help (refining), but what worked for me is changing the under relaxation factors. drop them by a lot and see what happens.

February 19, 2010, 05:04	real gas simulation in ejector for supersonic flow	#1
rahul_bhad1 New Member rahul Join Date: Feb 2010 Posts: 1 Rep Power: 0	I were doing simulation of real gas for supersonic ejector. But, the following message is appearing while starting the iterations. Error: REFPROP_error (202) from function: tprho (density) [TPRHO error 202] liquid iteration has not converged for T = NaN K, P = 0.20000E-01 MPa, rho (last guess) = NaN mol/L, compositions = 1.00000 Error Object: () The boundary conditions are given as follows - pri. flow inlet - pressure inlet 400600 Pa, total temp. 78 C sec. flow inlet - pressure inlet 39990 Pa, total temp.8 C pressure outlet - pressure outlet 40000 Pa, backflow total temp. 35 C. Real gas used is R141b. Can anyone help me?

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March 31, 2015, 21:12		#2
amjadfirst New Member Amjad Farah Join Date: Mar 2013 Posts: 11 Rep Power: 13	I had that happen to me a few times under different conditions. Changing the mesh could help (refining), but what worked for me is changing the under relaxation factors. drop them by a lot and see what happens.