[Mojtaba.a]

Hello All,
I have been trying to find a benchmark paper (Experimental or Numerical) for validation of Lagrangian Particle Tracking in OpenFOAM.

I have two general questions,

1) Lots of papers out there, have discussed about the particle concentration in a field and not the particle counts. As you know particle concentration is taken into consideration when one solves the eulerian model of the particles (Mass transport). However I don't know how to compare my lagrangian results with those of eulerian ones. How can I convert my lagrangian data (including particles position, size, etc) into eulerian concentration?

2) Is there any trustable lagrangian benchmark paper which I can use for validation!?

[Mojtaba.a]

Well I found the answer to the first question. This can be done easily using swak4Foam. Just need to add massFraction function of swak4Foam into the controlDict:

massFractionKinematic {
type expressionField;
autowrite true;
expression "lcsMassFraction(ParticleCloud)";
outputControl timeStep;
outputInterval 1;
fieldName ParticleCloudMassFraction;
}

[Tariq Ahmed]

Hi,
I would like to know how to sample the droplet velocities and size using swak4foam as I want to postprocess using Matlab

Tariq

[Mojtaba.a]

Originally Posted by Tariq Ahmed

Hi,
I would like to know how to sample the droplet velocities and size using swak4foam as I want to postprocess using Matlab

Tariq

Well Dear Tariq, I am not actually familiar with that, here I have just converted the lagrangian data into eulerian using swak4Foam.

Experts can help you in this field.
Hope you the best.

[Tariq Ahmed]

Thanks for replying. So do u know how to convert lagrangian particle velocity into eularian one like u have done for particle mass fraction? And also when I used the above code in control dict, my solver didnt create a postprocessing folder for saving the mass fraction values. i am using sprayfoam solver

tariq

[Mojtaba.a]

Hi,
Sorry for the late response.
Well I am not sure about the first question but about the second, There will be no postProcessing folder. Actually massFraction will be created individually for each time step. You can see massFraction as a new parameter in paraview while post-Processsing.

[chpjz0391]

Originally Posted by Mojtaba.a

Well I found the answer to the first question. This can be done easily using swak4Foam. Just need to add massFraction function of swak4Foam into the controlDict:

massFractionKinematic {
type expressionField;
autowrite true;
expression "lcsMassFraction(ParticleCloud)";
outputControl timeStep;
outputInterval 1;
fieldName ParticleCloudMassFraction;
}

Hey Mojtaba,
I met the same question as urs. I wanna calculate the mass concentration of particles(kg/m3) Can I use massFractionKinematic to achieve my goal. If I can ,could you plz post ur code in ur controlDic, thx.