johnwang wrote: ↑
Wed May 20, 2020 3:38 am
Lookid wrote: ↑
Tue May 19, 2020 11:36 am
like rotating regions, cyclic patches, you can't place probes or so as you want, it is just more convenient for me to use OF normally in this case.
I was thinking you may need to simulate a part of the wheel (one passage) and the whole volute separately and how to connect them. It will be great to see one of this kind example.
Hope people are interested to expand the capability of the WB.
It is not a FreeCAD problem at this point but np
If you make steady-state simulations of a radial pump like this, you have the problem that the solution will depend on the impeller position. It is due to the volute tongue or nose, depending on the languages. It's just where there's the connection to the outlet pipe. This is called the ''Frozen-Rotor'' Approach.
There is a way to do exactly as you said, simulate 1 passage, average circumferentially and transpose the results to the volute, it is called the ''Mixing-Plane'' approach. A version of this is implement in foam-extend, but I never managed to have it work properly.
Otherwise, as you said, you could compute 1 passage, compute the average velocities in the (r, theta, z) reference frame, and use those as inlet boundary conditions for the volute. I am not sure how accurate this would be, and at this point it might be easier to simply compute the whole pump in an unsteady simulation.
With the Workbench, it would be nice to have more functionality yes, or a full GUI for OpenFOAM. But that would be a LOT of work I suppose and the problem is that it is easy to simply deal with OpenFOAM besides the workbench, especially now that you can have OpenFOAM on Windows easily.
What do you think?