Numerical Simulation of Ventilation in a Room

CFD simulation is helpful for the prediction of ventilation system performance. In this post, I redid the study of Kobayashi [1] using buoyantBoussinesqSimpleFoam in OpenFOAM.

The grid is prepared with snappyHexMesh. The back ground grid is created with blockMesh ant STL files are imported from CAD software (CATIA).  The schematic of problem is presented in the below figure .

schematic of room for ventilation analysis

 

The final grid is shown below.

The generated grid with snappyHexMesh for ventilation in a room
The generated grid with snappyHexMesh for ventilation in a room
The generated grid with snappyHexMesh for ventilation in a room

The RNGkEpsilon is chosen for turbulence model. In order to obtain boundary layer effect, the wall function  is employed. The yPlus is around 5.  The fixed flux boundary condition is employed for several boundary using groovyBC.  The result of simulation is shown below.

velocity contour, simulation is done with buoyantBoussinesqSimpleFoam

reference:

1- Kobayashi, N. and Chen, Q., 2003. Floor-supply displacement ventilation in a small office. Indoor and Built Environment, 12(4), pp.281-291.

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