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-   -   MULTIPHASE - FREE SURFACE & MIXTURE MODEL (http://www.cfd-online.com/Forums/fluent/35093-multiphase-free-surface-mixture-model.html)

 Aris November 17, 2004 11:21

MULTIPHASE - FREE SURFACE & MIXTURE MODEL

I try to model the flow into stratified sea. The cause for the stratification is the difference of the salinity. As I know, in Fluent I can't use the salinity as a parameter and calculate the density as a function of the salinity (and secondary of the temperature). So, I have thought to use the multiphase mixture model with two phases of liquid, (for example one with density 1010 and one with density 1025 kg/m3) and choose as initial condition the fraction of the two phases as a function of the depth.

On the other hand, the model requires free surface, so I need to use air as an additional phase including the VOF model. The conflict is that I can't use the VOF model and the mixture model simultaneously.

Any idea?

 Tanja November 18, 2004 10:50

Re: MULTIPHASE - FREE SURFACE & MIXTURE MODEL

You could try to use a UDS to describe the concentration of salt in the water. Then you can calculate the density of water depending on the value of the UDS in each cell by means of a simple UDF.

This way you don't have to use the mixture model, and you can use the VOF model for your water-air surface.

 Aris November 19, 2004 05:01

Re: MULTIPHASE - FREE SURFACE & MIXTURE MODEL

This is exactly what I need. Thanks a lot.

 anissa April 28, 2009 11:46

salinity

i want to know exactly how to enter the salinity

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