[pedroxramos]

Hello there!

I want to simulate the confluence of two flows of fluids with different density in an open channel, like this:

How I define the different inlets zones with two different fluids?

[CeesH]

Hi Pedro,

In your mesh, define 2 velocity inlets (at least, I assume you have a (constant) velocity profile for both fluids that you know?)

In boundary conditions, you can set the velocity inlet specifications.
Under phase-2 specifications, you can set the velocity and volume fraction of your second phase. Setting that to 1 means the inlet is pure phase-2, setting it to 0 means pure phase-1.

Best,
Cees

[pedroxramos]

Thanks for your reply.

But the problem is that for each inlet I have one different fluid and air. So, in the inlet 1 enters water + air and in the inlet 2 enters mud + air.

What should I do? I know that I should use VoF, right?

[CeesH]

Hi Pedro,

Could you tell a bit more about the setup? What you are describing now would actually be a 3 phase flow... do the water and mud mix? how is the flow distributed (are air & water separated in the inlet, or do you have a bubbly flow) and what's the size of the domain?

VOF is only useful in case there is a sharp boundary between the fluids which you can explicitly resolve; for a bubbly flow of macroscopic dimensions it is pretty much impossible to apply and you need to look into eulerian multiphase. But if the gas and water flow completely separate of eachoter, VOF may be an option...

[ramakant]

Originally Posted by pedroxramos

Hello there!

I want to simulate the confluence of two flows of fluids with different density in an open channel, like this:

How I define the different inlets zones with two different fluids?

Dear Sir

i am modeling lake\river flow with two different types of fluid is flow into the river but the properties of the fluid is different i.e.density,viscosity and the other properties . i need you help regarding the multiphase model which model is used such types of problems