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-   -   about density (http://www.cfd-online.com/Forums/flow-3d/79701-about-density.html)

great1427 August 31, 2010 21:54

about density
 
if Model setup -> Fluids -> Density is 100,

what does the text output that the macoscopic density in the free

surface (air) and model .

Does it output 100?

Thanks everyone.

MuxaB September 1, 2010 22:57

Quote:

Originally Posted by great1427 (Post 273545)
if Model setup -> Fluids -> Density is 100,

what does the text output that the macoscopic density in the free

surface (air) and model .

Does it output 100?

Thanks everyone.

That's correct.

great1427 September 2, 2010 04:33

Quote:

Originally Posted by MuxaB (Post 273687)
That's correct.

why does the air not show the air's density?

why does the model not show the model's density?

Is it normal?

thanks.

MuxaB September 2, 2010 21:53

In the one-fluid (fluid and void) model the density is that of liquid only, even in partially filled cells. The density in the void is not important but set at liquid density too.

If you were to use the two-fluid model, then each cell's density will be volume averaged over the cell volume

great1427 September 2, 2010 22:14

Quote:

Originally Posted by MuxaB (Post 273813)
In the one-fluid (fluid and void) model the density is that of liquid only, even in partially filled cells. The density in the void is not important but set at liquid density too.

If you were to use the two-fluid model, then each cell's density will be volume averaged over the cell volume

thanks a lot:)

great1427 September 3, 2010 01:12

I have a problem.

if the initial condition is the water in the model, and I put another density fluid,

then in the Drift-flux model,

the density of phase#1 and density of phase#2 what should I give?

Is the density of phase#1 water, or the density of phase#2 ?

thanks

MuxaB September 6, 2010 00:27

Phase 1 constitutes the continuous phase, i.e., water in your case, while phase 2 is the dispersed phase, e.g., air bubbles or solid particles.


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