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TwoPhaseEulerFOAM

Hello Friends,

I am using twophaseEulerFoam for simulation of Fluidized Bed. I want to know that what are the JohnsonJacksonCoeffs

{
Fr 0.05;
eta 2;
p 5;
phi 28.5;
}

Regards

Harshawardhan

Greetings Harshawardhan,

I was going to say that the source code has the answer, but: https://github.com/OpenFOAM/OpenFOAM...tionalStress.H

Quote:

Code:

        //- Material constant for frictional normal stress

        dimensionedScalar Fr_;



        //- Material constant for frictional normal stress

        dimensionedScalar eta_;



        //- Material constant for frictional normal stress

        dimensionedScalar p_;



        //- Angle of internal friction

        dimensionedScalar phi_;

Only the last one is clear on what it is exactly. The first three seem consistent with the theoretical modelling for this kind of simulation.
A bit of research into this topic leads me to believe that they are all empirical model coefficients of the following bibliographic reference:

Quote:

Johnson, P. C., and R. Jackson (1987), Frictional-collisional constitutive relations for granular materials, with application to plane shearing, Journal of Fluid Mechanics, 176, 67–93

Best regards,
Bruno

If someone needs information about the aforementioned parameters, this reference could also be useful:

P. C. JOHNSON, P. NOTT , R. JACKSON, Frictional-collisional equations of motion for
particulate flows and their application to chutes, J . Fluid Mech. (1990), pp. 501-535

Starting from eq. (2.18).

Regards,
Darko