How to define Saline water in Fluent
 

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

Re: How to define Saline water in Fluent
 

mixture model, even without slip velocity, is good idea

Re: How to define Saline water in Fluent
 

Thx Bohis

but could you explain a little bit more?

Re: How to define Saline water in Fluent
 

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.

Re: How to define Saline water in Fluent
 

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...

Re: How to define Saline water in Fluent
 

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.

Re: How to define Saline water in Fluent
 

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.

Re: How to define Saline water in Fluent
 

And how it is possible to define characteristic diameter of drops of the second phase?

Re: How to define Saline water in Fluent
 

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...