Two different methods for modeling a rotatory system
There are two possible methods for modeling a rotatory system (such as a water turbine),
1) using a moving mesh
2) fixing the blades, and rotating the housing employing an angular velocity boundary condition. (fixed grid)
It is clear that the second approach is much easier to implement. I wonder to know their differences? Do they both result in similar results?
Thank you very much,
Actually, if you are modelling an internal flow, you need both. You need to rotate the whole mesh (the rotor turning) and then apply a reverse rotation to the boundary (since the wall should be static). Otherwise the system will look static from the fluids point of view.
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