[farzadmech]

Hello there

I am simulating cavitation for a Francis turbine. Francis turbine is rotating with 826 rpm. I have two questions;

1- Vapor pressure for my case is 2100 Pascal, and Temperature is 25 Celsius, now for the "water vapor" how should I find density and viscosity? is there any table for this? Is this table based on VAPOR pressure or temperature? Or should I use the Fluent default values?(plz see Figure 1)


2- Second problem is that when I use Upwind schemes, I got fairly ok values(not accurate enough though), and also my cavitation has a weird part too. when I switched to second order schemes, then cavitation disappears, but I got better results(shaft output, mass flow rate, ...). What should I do? (plz see figure 2)




Thanks,
Farzad