[dxue]

When modelling cavitation on a hydrofoil, what are the values of inlet and outlet pressure one should enter to obtain a specific cavitation number?

[DEd]

The cavitation number is a measure of how close you are to cavitation and it can be defined for every point according to the following formula:

Ca = (p_loc - p_vap)/(0.5*rho*U_inf^2)

Where U_inf is the velocity far from the hydrofoil.

What do you mean by "optain a specific cavitation number"?

[dxue]

What i meant to say is that I wanted to carry out the simulation using different cavitation numbers. This can be done by changing the magnitude of velocity.

I initially thought I had a wrong set up however the simulation was not converging due to incorrect initialization.

[DEd]

Ok, maybe this is arguing about semantics but I wouldn't say that you are "using different cavitation numbers". The cavitation number is a part of your solution the same way that pressure is. Or in other words, the cavitation number is always an output never an input to a calculation.

On a side note: If you are doing valve analysis there is a global parameter called cavitation index (sigma) that is defined as:

Sigma = (P_up - P_vap) / (P_up - P_down)

This parameter can be used as an input value for a CFD calculation.

[dxue]

I am analysing the cavitational effects on hydrofoils and examining its effect on the lift coefficient.