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Steam Ejector 2D simulation

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Old   November 22, 2013, 17:25
Default Steam Ejector 2D simulation
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Ahmed
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I need to study pressure and temperature for large scale ejector, with following boundary :
Primery inlet pressure 6.7 bar and 453 K
Sec Inlet pressure .094 bar and 318 K
Out let 0.3 bar and 343 K
I used K-e realizable model
first primary steam expand and be in wet region then entrained Secondary steam and mix at wet region then flow shocked and out saturation steam.
solution always diverge before starting calculation due to many reasons:
# Divergence detected in AMG solver: k -> Increasing relaxation sweeps!
# Divergence detected in AMG solver: Coupled -> Decreasing coarsening group size!
Divergence detected in AMG solver: WSB-eq
Divergence detected in AMG solver: WSN-eq

I used Density based and wet steam as multiphase and tried to change it to pressure based and mixing but without any results

can anybody help me to solve may case as i'm beginner in Fluent and CFD
I tried to Decreasing coarsening group size and Increasing relaxation sweeps but solution still diverge and floating
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