Internal Compressible Flow: boundary conditions
Hi everyone,
I have some problems in setting up the proper boundary conditions for an internal compressible flow (e.g. flow through a convergent-divergent nozzle), using a generic compressible solver like rhoSimpleFoam. I have found out that many OF users have encountered the same issues, so I think it would be nice if, once and for all, we could find a solution. Tipically, such cases comprise, in addition to a wall (on which a no-slip condition is assumed), an INLET face and an OUTLET face. So the question is: what are the right boundary conditions to be set for p and U on such faces in order to reach a convergent solution? Thanks in advance. |
Hi,
someone who could send a converged test case for a similar flow would be greatly appreciated. Thanks |
Hi Francesco,
did you make any progress? I am trying to modify rhoSimplefoam as well as I am having problems with floating points due to thermal properties, maybe we can work on that together, let me know! |
Hi, guys!
I have been working on a similar problem for the last couple of weeks (using a modified version of the fireFoam solver), and have had severe difficulties getting a correct flow field with a module with inflow/outflow. I have tried many different configurations, but what has worked for me is to use totalPressure BCs for p_rgh with a pressure gradient between the inflow and outflow patch, and pressureInletOutletVelocity for U. p_rgh: Quote:
Regards, Sindre |
Hi Sindre, thank you for sharing your findings, would try it out when I have some free time!
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