Cavitation 2D geometry

[javier101191]

Hi everyone,

I have a problem with a 2D geometry where get static pressures of -95000 [Pa], and with the cavitation module enabled, when i look at cavitation there is 0%, although i have changed in phase options of the water the vapor pressure to 50000 [Pa] (i know thats not real, but it was to check if cavitation module was working).

Could anyone help me?

[srhusain]

You might also suppress the outer-most solid and select the smallest edge of the fluid boundary to apply the pressure BC. Note that the outer solid is not essential to the fluid flow problem.

[javier101191]

thanks for all, i am going to try to do that thing, and i will say you if the problem disappears

[srhusain · Accepted solution]

Attached is a modified support file that you can try. The attached picture shows some cavitation near the bottom of the model.

[javier101191]

magic???really thank you!!! but i dont understand why does it run... :S

[srhusain]

I think the key is to use small time steps and 3 nner iterations per time step to get accurate transient simulation. Of course, the pressure boundary condition is essential for stability. Here, I am using 0.5 degrees per time step in order to ensure that the rotor mesh faces (edges) do not skip its counterparts on the stator side as skipping would cause a loss of information transfer between rotot and stator.