Sudden expansion problem

yongha

I'm just started to use STAR-CD, so can you reply eazly? Thanks alot ^^

Model is Sudden expansion problem

Pressure boundary condition

inlet : pressure(high(75atm))

oulet : pressure(low(1atm))

I used two user subroutine, 1: densit.f (respect to pressure and temperature(not ideal gas)) coteet.f (H(T,DEN) and T(H,DEN))

I runned the program but divergence

In .info file, there are two warning every time step.

*** WARNING #042 *** PROCESS NOT FULLY CONVERGED -- EQ.,NIT,RESI: PCOR 1 0.28258E-09

*** WARNING #043 *** MINIMUM RESIDUAL AT THE END, RETURNING NON-CONVERGED SOLUTION

Please tell me why it occurred !!

Thanks your attention