Learning Forum

[lee3a4]

My goal is to simulate supersonic combustion, which seems to require pressure-based solver (PBS). I noticed that the combustion model is not enabled with density-based solver (DBS).

Before I turned on combustion, I decided to obtain a cold flow solution. It worked well with DBS, but not with PBS. I tried various things, but I cannot get the solution with PBS that seems to be necessary for combustion. Due to numerical instability, I used inlet-pressure BC (instead of inlet-velocity BC), but the resulting inlet velocity is lower than what I expect and the solution is not accurate. In addition, I cannot go up to the inlet Mach number of 5 that I could with DBS. I tried both steady and transient solutions, and viscous and inviscid solutions. I have been increasing the inlet pressure gradually, but the solution diverges when the inlet Mach number exceeds 2 approximately. Reducing the values of URFs don't help.

Please give me advice on how to obtain good supersonic flow solutions with PBS. Thank you in advance.

[lee3a4]

Somehow, when I click the title of my question posted, it says "The comment you are looking for could not be found". I am just posting this comment to see if it helps.

After I posted this comment, now my question is visible. I would appreciate it if anyone can tell me why this happens.

[Rob]

Duplicate of /forum/discussion/30512/supersonic-internal-flow-with-pressure-based-solver#latest If you double posted the system may freeze a post for a short period.