Warning: boundary Mach number exceeds maximum limit on pressure-outlet

Tarantino · March 20, 2013, 10:05

Ciao!

I have ran a case in HVAC system with multi outlets. I got the warning "reversed flow in *** faces on pressure outlet" in two outlets. the residuals are straight horizontal and the didn't fall below 1e-1. So the results are not converged. How can I fix the problem to got a converge solution? I am wonder if this back flow is one of the reason that I cannot got converge or not? How can I avoid Back-flow? I refine the mesh, but still the same problem.
Ps: inlet set as mass flow inlet, outlets are set as outlet-vent or pressure outlet.

Thanks.

Tarantino · March 22, 2013, 21:30

Hello!

Please, give me any suggestion to avid back flow, I stuck in this situation.

March 20, 2013, 10:05	How to avoid reversed flow in faces on pressure outlet *??	#1
Tarantino Member Tarantino Join Date: Feb 2013 Posts: 46 Rep Power: 13	Ciao! I have ran a case in HVAC system with multi outlets. I got the warning "reversed flow in *** faces on pressure outlet" in two outlets. the residuals are straight horizontal and the didn't fall below 1e-1. So the results are not converged. How can I fix the problem to got a converge solution? I am wonder if this back flow is one of the reason that I cannot got converge or not? How can I avoid Back-flow? I refine the mesh, but still the same problem. Ps: inlet set as mass flow inlet, outlets are set as outlet-vent or pressure outlet. Thanks. Last edited by Tarantino; March 22, 2013 at 21:59.

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March 22, 2013, 21:30		#2
Tarantino Member Tarantino Join Date: Feb 2013 Posts: 46 Rep Power: 13	Hello! Please, give me any suggestion to avid back flow, I stuck in this situation.