[sinatahmooresi]

hi friends!
i recently started to use op 3.0 after op 2.2.1 .
i want to use twoPhaseEulerfoam in version 3.0 but as i see there are some changes in this solver and made confused!
my first question is about how to find the description about this solver and it's tutorials in this version ?
and my second question about phase properties directory, why there is no place to define "density" here ?!
so i got confused about twoPhaseEulerFoam in OP3.0 !!
any help would be appreciated

[demichie]

The density is defined by the equations of state of the phases, in the thermophysicalProperties.*** files.
For example, in the laminar/bubbleColumn/constant folder you can find the file thermophysicalProperties.air, specifying the properties of the phase "air".

thermoType
{
    type            heRhoThermo;
    mixture         pureMixture;
    transport       const;
    thermo          hConst;
    equationOfState perfectGas;
    specie          specie;
    energy          sensibleInternalEnergy;
}

mixture
{
    specie
    {
        nMoles      1;
        molWeight   28.9;
    }

In this case the equation of state is perfectGas (rho=P/(RT)), and the parameter used to calculate the gas constant form the universal gas constant is the molecular weight.

Ciao
M.

[sinatahmooresi]

hi Mattia!
thank u very much, i want to model consist of two liquid phase , so is that "mu" the only place that i can make difference between primary phase and secondary phase ? because when both of phases are liquid ( like water and brine) so we have to use "perfectfluid" for eqn of state ?
i mean that is R and rho0 are respectively constant in 3000 and 1027 when we use "perfectfluid" ?
so what is the main difference between two phases in this case that we have two fluids with only different rho(density) ? ( water=998.2 and brine 1017.9)
thank u

[demichie]

You don't have to use the values 3000 and 1027 for perfectFluid, but you can change them. When you use the equation of state for perfect fluid rho=rho0+psi*P, where the compressibillity psi is given by psi=1/(RT). So probably you want to use the values you've indicated (998.2 and 1017.9) for rho0 in the two files with the properties of water and brine.

M.

[sinatahmooresi]

thank u very much dear Mattia!
is there any way to find a kind of description about twoPhaseEulerFoam in version 3.0.1?
because I have many question about it ! like alphat directory (not alpha) and...