[rkc.cfd]

Hi,

I am trying to implement mixing of buoyant turbulent helium jet with ambient air. I have taken rhoReactingBuoyantFoam and dropped the eEeqn as I am doing an iso Thermal jet. I switched of both chemistry and combustion.

The velocity is dissipating immediately after the entrance and its quite strange and dont know to address this issue.
velocity.png

My Thermo settings are

thermoType
{
    type            heRhoThermo;
    mixture         multiComponentMixture;
    transport       const;
    thermo          hConst;
    energy          sensibleInternalEnergy;
    equationOfState incompressiblePerfectGas;
    specie          specie;
}

My LES settings are

LESModel        Smagorinsky;
turbulence      on;
printCoeffs     on;
delta           cubeRootVol;
cubeRootVolCoeffs
{
    deltaCoeff      1;
}
  SmagorinskyCoeffs
    {
      filter simple;
      ce 1.048;
    }

The domain I am simulating is simple cylinder connected to the a box.
domain.png
The mesh is coarse to check the running of the simulation at 1.7M cells.
mesh.png
Attached are also the boundary conditions and schemes used.
0.tar.gz

system.tar.gz

Hope somebody can provide some suggestions to find the issue of the velocity dissipating immediately after the inlet.

Cheers