Hello Everyone!

So, I am doing some simulations on hydrodynamic cavitation in a Venturi type tube and would like to find a good mesh for this, within the constraints of the student package. I would like to have a notion of how to find the best values for cell size near the wall.

What would be best? Do an analytical calculation in the Venturi regions and apply for each zone or calculate for the most critical zone and define for all? (since if the boundary layer is resolved in the critical zone, the same value would also satisfy the Venturi input for example and other regions). In this case, I say analytical calculation, to get a sense of the velocity in the regions and apply it to the Y + formula with the flow conditions, using Y + calculators available on CFD sites.

Below a image of geometry.

Thanks a lot! Every help and idea are welcome.

Mantovani.