[vidyadhar]

Hello All,

I am trying for cellZoneInjection to inject particles in my case.

The cellZoneInjection.H file specifies the following:

Class
CML::CellZoneInjection

Description
Injection positions specified by a particle number density within a cell set

- User specifies
- Number density of particles in cell set (effective)
- Total mass to inject
- Initial parcel velocity
- Parcel diameters obtained by PDF model
- All parcels introduced at SOI

Accordingly, I have created injection model (in bubbleCloudProperties File) which looks like below:

injectionModels
{
model1
{
type cellZoneInjection;
SOI 0.0;
massTotal 3.4746e-08;
parcelBasisType mass; //fixed;
nParticle 1;
cellZone particle_INLET1; //particleSupplyCellZone;
numberDensity 20000;
duration 5e-5;
U0 (0 0 0.04175); //(0 0 0);

sizeDistribution
{
type fixedValue;
fixedValueDistribution
{
value 0.48e-03; //0.006;
}
}
}
}

When I execute my solver, I am getting the following warning message:
From function CML::CellZoneInjection<CloudType>::updateMesh()
in file lagrangian/intermediate/lnInclude/CellZoneInjection.hpp at line 397
Number of particles to be added to cellZone particle_INLET1 is zero

My Simulation is not stopping but, particles are not adding into the domain.
Can anyone tell me how to resolve this issue.


Thanks & Regards,
vidyadhar

[CowAndFlow]

Hello Vidyadhar,

I was facing the same problem when creating a cellZone with topoSet. The cellZone is written to polyMesh/sets/'yourCellZone'. I just copied the CellLabels from that into the file polyMesh/cellZones. Laborious, but worked.

Best
David

[vidyadhar]

Hello David,

Thank you for your reply.

I got to do in a different way. Thanks to Darrin Stephens for this.



injectionModels
{

model1
{
type cellZoneInjection;
cellZone INLET; // Name of cellZone
SOI 5; // Start Of Injection
//flowRateProfile constant 1; // Flow rate profile relative to SOI
parcelBasisType fixed; // How are the number of particles calculated
nParticle 1;
numberDensity 13e05; // numberDensity multiplied by cellZoneVolume gives the number of particles to be injected
duration 5e-5; //cellZoneInjection through this manner is a one time injection, i.e., all the particles will be injected at once
U0 (0 0 0); //initial velocity of the particles upon injection
massTotal 24e-3; // Total mass injected over injection duration


sizeDistribution
{
type fixedValue;
fixedValueDistribution
{
value 1e-03;
}
}
}


}

Regards,
vidyadhar

[uosilos]

Hi, I am using cellZoneInjection.


Let's suppose I want to introduce 0.005 kg (massTotal) distributed inside a cellZone defined with topoSet.


The number of particles is easy to calculate, since we now total mass and particle volume and density.



The volume of this cellZone is known so I calculate the numberDensity as total number of particles/volume of cellZone.


However, seems that my computer cannot handle so big number of particles, so how can I include more than one particle in one parcel while keeping total mass equal to 0.005kg. totalMass is totally bypassed when parcelBasisType is fixed. Is nParticle the number of particles in a parcel?


Thanks