[rnbd5782]

Hellow everyone! ^_^

Im studying the CBD(Center Body Diffuser) which simulate high altittude condition. CBD is the supersonic exhaust diffuser.

So i used Density-based type. and In oder to reduce the time required, i used steady-state solver. According to the reference paper, generally k-omega-sst model is used to analyze CBD so i used k-omega-sst model and energy equation. and for cold test, i used nitrogen for fluid materials.

The problem is "time step reduced in cell xxx". When this sentence appear, Calculation go divergence.

i can't undertand why time step reduced occur in steady-state condition.

if you have any solution about that problem, please advise me.

if you don't mind receving the Case file which i made, i would send you to your e-mail.

pleaese help me.

Thank you.