[jgross]

Hello,

I am using MRFSimpleFoam from OF Extend 4.0 (mainly because I would like to use grid generalised interface feature not available on OF v5.0) to simulate internal 2D flow through a centrifugal pump.

I am finding the simulations are not meeting residual criteria, as the simulations will always run until the final time specified. Upon inspection of the data, it is easy to see that the solutions have approximately converged, as there is not much deviation in quantities such as flow rate and head from a certain point (see the FlowRateAndHead.jpg).

Furthermore, if I perform a grid convergence study, I do not reach a grid converged solution until approximately 1.5e+6 - 2e+6 elements (see the GridStudyQ.jpg). I am using an unstructured mesh (you can see an example of a coarse mesh in 2DPumpGeometry.png), so I expect more elements to be required. However, this seems fairly unreasonable for a quasi-steady state simulation.

All of this together is making the run times much longer than I would expect for a 2D quasi-steady state simulation (see GridStudyTime.jpg).

I have also copied the case folder to my OneDrive account and a link is available here

https://universityofcambridgecloud-my.sharepoint.com/:f:/g/personal/jg847_cam_ac_uk/EvQU4R0beL1As7yFza5dggIBppKNJlUoea85_LD5jhENVg?e=sfNQIe

Any suggestions for improving the convergence and run time for this would be greatly appreciated.

Regards,
J