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particle number concentration in OpenFOAM

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Old   August 22, 2013, 12:04
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I found answers to all my queries. Below thread was really helpful:

LTSReactingParcelFoam Solver on an Airfoil

Thanks Yogesh for providing a hint.

Cheers,
Mayank
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Old   August 27, 2013, 16:26
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Hi Yogesh,

Sorry to disturb you again.

Now, I am trying to calculate deposition of particles on tube wall. So what changes should I make to 'localInteractionCoeffs' such the particle sticks to the wall as soon as it touches it and also want to count those.

Regards,
Mayank.
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Old   August 28, 2013, 00:23
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Hello ,

For 'wall' write in localInteraction

wall
{
type stick;

}

Regards,
-Yogesh
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Old   August 29, 2013, 15:37
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Hi,

I have a problem and I am trying for many days. I am doing one way coupled(in a bifurcating tube with one inlet and two outlets) simulation using icoUncoupledKinematicParcelFoam with pre-defined steady state velocity field . Diameter of INLET is 6mm and that of OUTLET1 is 4mm and OUTLET2 is 6mm. I am injecting 10,000 spherical particles of 0.6mm diameter the ratio of particles coming out of OUTLET2 to OUTLET 1 should be close to 1 but I am getting way higher particle ratios. I have tried mesh refinement, ratio are getting worse. I have tried changing the fluid, initial particle velocities and steady state fluid velocity field and nothing helps! Please anybody can comment and give an idea for changing things. Same simulation done on CFX and fluent yield satisfactory results.

Regards,
Mayank
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Old   September 4, 2013, 11:45
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Hi,

1.) In 'kinematicCloudProperties' what does below means:

'coupled true/false;'

what difference will true or false make?

2.) I want to give initial particle velocity same as the velocity of fluid? How can this be done, since my inlet velocity profile is a fully developed parabolic one for fluid phase and I want particles to follow the same profile that is at inlet? The option available for specifying initial velocity in 'kinematicCloudProperties' file is:

U0 (0 0 0); // it will take only uniform velocity profile

Can groovy expression be used here?

Regards,
Mayank

Last edited by mayank.dce2k7; September 4, 2013 at 13:21.
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Old   September 9, 2013, 18:32
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Hi Foamers,

How can I give 'U0' (in kinematicParticleProperties) in form of a table specifying each particle's velocity ?

Regards,
Mayank.
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Old   April 30, 2014, 09:19
Default Particle inlet velocity
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Hi Mayank,

Did you find the answer to your question? I'm struggling with the same problem.

Best regards
rafab
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Old   April 30, 2014, 13:21
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Hi,

I guess you are referring to this question:

How can I give 'U0' (in kinematicParticleProperties) in form of a table specifying each particle's velocity ?

You can use KinematicLookupTableInjection...here you can specify properties of each particle.

Regards,
Mayank.
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Old   April 30, 2014, 13:37
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Yes, that's exactly what I asked about and what I need.

Thanks a lot. It will help me a lot

Cheers
rafab
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Old   May 28, 2015, 09:22
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Quote:
Originally Posted by mayank.dce2k7 View Post
Hi Yogesh,

Sorry to disturb you again.

Now, I am trying to calculate deposition of particles on tube wall. So what changes should I make to 'localInteractionCoeffs' such the particle sticks to the wall as soon as it touches it and also want to count those.

Regards,
Mayank.

Dear Mayank,
Did you find answer for your problem? I have the same problem.
I am simulating droplets in a L shape channel. I am using the following conditions:
patchInteractionModel localInteraction;

localInteractionCoeffs
{
patches
(
WALL
{
type rebound;
e 1;
mu 0.9;
}
);
}

In my log file it is reported that:

Parcel fate (number, mass) : patch WALL
- escape = 0, 0
- stick = 0, 0


I want to count the number of droplets deposited on the wall. Ho can Count it ? Shall I add a specific command in kinematicCloudProperties to show the number of droplets deposited?
Cheers,

Last edited by Alaska1964; May 29, 2015 at 03:57.
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