[mehdi199]

I want to reproduce the thermohaline circulation on fluent , i need to use two fluid (hot & cold water) , i know i must use the multiphase but i don't know how to set it.the result must be like this :

https://interstices.info/upload/docs...bouteilles.mp4

Thank you

[Hesam_Ami]

Hello Mehdi,
Because the boundary between the two fluids is clear, you should use vof model.
( mixture >> vof)

[silent2608]

use vof model, explicit

how to get water into your model

- initialize with 0 water volume fraction (only air)
- adapt region -> mark regions where you need water initially
- in solution initialization window go patch -> use the region, select your water phase and patch the zones with vol.fraction = 1 for water
- with energy equation enabled I think you can also use the same region to patch the cells with temperature afterwards

google vof best practices fluent or something similar to get some pointers on decent settings to start with (I'd use mapped quad mesh, presto, compressive interface reconstruction, explicit vof w/ variable time stepping (courant <= 1)

edit: works like I thought, patch fluid, then patch temperature in those cells afterwards

[mehdi199]

Thank you , i'll try it.

[mehdi199]

I don't why i can't patch temperature ?

[silent2608]

enable energy equation

patch water


patch window select mixture, select temperature, input temperature in kelvin, select region to patch -> patch


now you have patched water and afterwards patched that region with the temperature you need

VOF solves single set of equations for the whole domain, hence you can't select a phase and patch temperature for a phase
I guess if you will VOF model is pseudo-multiphase, it solves equations based on local density, but it's not actually aware there are discrete phases (which is why reconstruction step builds phase interface from local density)

[mehdi199]

It works , thank you