"Frozen" velocity field. Robin?

October 28, 2003, 10:14

Hi!

Can someone tell me what happens in the solver when the expert parameter "solve fluids" is set to f? The hydrodynamic equations are not solved, I know that much. I also understand that this means that only the velocity field is frozen, the temperatures in the fluid are still changing. But how does CFX calculate viscosity in the fluid? Using Sutherland's formula? And density, does that change?

Would be grateful for answers...

/Märta-Karin

October 28, 2003, 12:38

Hi Märta-Karin,

If solve fluids is to f, the solve is not solving for a new mass and momentum field. This has nothing to do with the viscosity calculation. Density may still vary with temperature, depending on you fluid, but it will no longer be consistant with the solution.

Viscosity is specified in the material properties as a value or expression.

Regards, Robin

October 28, 2003, 10:14	"Frozen" velocity field. Robin?	#1
Märta-Karin Guest Posts: n/a	Hi! Can someone tell me what happens in the solver when the expert parameter "solve fluids" is set to f? The hydrodynamic equations are not solved, I know that much. I also understand that this means that only the velocity field is frozen, the temperatures in the fluid are still changing. But how does CFX calculate viscosity in the fluid? Using Sutherland's formula? And density, does that change? Would be grateful for answers... /Märta-Karin

October 28, 2003, 12:38	Re: "Frozen" velocity field. Robin?	#2
Robin Guest Posts: n/a	Hi Märta-Karin, If solve fluids is to f, the solve is not solving for a new mass and momentum field. This has nothing to do with the viscosity calculation. Density may still vary with temperature, depending on you fluid, but it will no longer be consistant with the solution. Viscosity is specified in the material properties as a value or expression. Regards, Robin

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