[samiam1000]

Dear All,

I am looking for a solver that allows to solve the problem of 2 miscible fluids.

Basically, I would need a simple (or pimple) foam, where I can add the transport equation for a passive scalar.

The point is that the 2 liquids have different properties, hence I have to model the density and the viscosity of the mixture, also.

Let me try to give you all the details:

passiveScalar = alpha;
LiquidaA (LA): density = rhoA; viscosity = nuA;
LiquidaA (LB): density = rhoB; viscosity = nuB;
alpha = fraction of the passive scalar of LA in a cell

I start my simulation and I set alpha = 1 on inlet1 and alpha = 0 on inlet2. In a certain timestep, I do have - in a cell - alpha = alphaXXX: this means that I want to update the mixture properties like:
rho = (rhoA*alphaXXX + rhoB(1-alphaXXX))
nu = (nuA*alphaXXX + nuB(1-alphaXXX))

considering that the total volume is exactly equal to the sum of volumeA and volumeB.

Has anyone already written something similar?

Could you kindly help?

Thanks a lot,
Samuele

[alexeym]

Hi,

Application
    twoLiquidMixingFoam

Description
    Solver for mixing 2 incompressible fluids.

    Turbulence modelling is generic, i.e. laminar, RAS or LES may be selected.

Is it what you are looking for?

[samiam1000]

Not exactly, twoLiquidMixingFoam (that is what I am using) consider the interfaces with the VoF. But it has to solve interface equations and it becomes slower and slower. I am looking for a much lighter tool.