

May 19, 2018 at 7:26 amadarshSubscriber
Dear all, I am trying to simulate cavitating flow over a hydrofoil on FLUENT. For some reason, I seem to be getting a floating point exception error and the calculation stops. What can be the reason for this?
I believe I have a good mesh ( average skewness 0.008). The boundary conditions are as follows:
Inlet ( Velocity inlet) velocity magnitude  7 m/s and angle of attack 8 degrees.
outlet ( pressure outlet) gauge pressure 0 pa.
Also how can we set the cavitation number on fluent?

May 20, 2018 at 12:38 pmRaef.KobeissiSubscriber
Hi,
Can you give more explanation about the cavitation number? Also please see this tutorial on cavitation:

May 21, 2018 at 1:18 pmadarshSubscriber
The Cavitation number (Ca) is a dimensionless number used in flow calculations. It expresses the relationship between the difference of a local absolute pressure from the vapor pressure and the kinetic energy per volume, and is used to characterize the potential of the flow to cavitate.
It is defined as
where
 {displaystyle rho } is the density of the fluid.
 {displaystyle p} is the local pressure.
 {displaystyle p_{mathrm {v} }} is the vapor pressure of the fluid.
 {displaystyle v} is a characteristic velocity of the flow.
So i set the cavitation using the pressure at pressure outlet. So for a range of 1.2 2 I calculate the p in the above equation and then subtract the atmospheric from it.
I have already watched the tutorial and modelled my problem on this. I cant seem to generate any lift on the hydrofoil for some reason. and also the drag is very low compared to experimental cases

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