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How to define Saline water in Fluent

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Old   May 8, 2008, 23:04
Default How to define Saline water in Fluent
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Vin
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I am trying to simulate the density current by Fluent. The saline water runs into fresh water. Any idea for defining saline water in Material panel in Fluent?

Should I create a mixture composed of salt and water? But the salt is solid, it is dissolved in the water. HOw can I do it? Thank you

Vin
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Old   May 9, 2008, 03:32
Default Re: How to define Saline water in Fluent
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bohis
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mixture model, even without slip velocity, is good idea
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Old   May 9, 2008, 05:11
Default Re: How to define Saline water in Fluent
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Vin
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Thx Bohis

but could you explain a little bit more?
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Old   May 9, 2008, 05:25
Default Re: How to define Saline water in Fluent
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bohis
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I do not know how exactly is mixing of normal water and saline water driven, however, I feel that it is mixed somehow homogeneously. Moreover, I would expect both to share one velocity field, so I would use mixture model without slip velocity. I suggest to have two phase (normal water, saline water) They will differ just in densities and viscosities and that it is. I think it could be fine.
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Old   May 9, 2008, 05:29
Default Re: How to define Saline water in Fluent
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Vin
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Yep, that is rite. But saline water itself is a mixture, how to define it in material panel? What I am thinking is to define water and salt seperately, but salt is solid...
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Old   May 9, 2008, 05:37
Default Re: How to define Saline water in Fluent
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bohis
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I would keep it simple. Salt is supposed to be dissolved in water, is not it? It does not sounds good to me to model salt as solid particles.
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Old   May 9, 2008, 07:08
Default Re: How to define Saline water in Fluent
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carno
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Get the saline water properties directly and model as new material/fluid. No need to model saline water as mixture of solid salt and liquid water. As simple as that. Rest of the modelling of mixing of saline and regular water can be modelled as two different phases as explained by bohis.
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Old   May 9, 2008, 08:20
Default Re: How to define Saline water in Fluent
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denizen
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And how it is possible to define characteristic diameter of drops of the second phase?

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Old   May 9, 2008, 08:51
Default Re: How to define Saline water in Fluent
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Vin
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The problem is that no saline water property is available except for fractional density. And do you guys think it is possible to convert this problem into the density current driven by temperature difference? If keep the density difference the same in both cases...
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