CHT

1.

The analysis type Conjugate heat transfer (CHT) allows the simulation of the heat transfer between Solid and Fluid domains by exchanging thermal energy at the interfaces between them. It requires a multiregion mesh to have a clear definition of the interfaces in the computational domain. Such a mesh can be created with the Hex-dominant parametric operation in the mesh creator. Typical applications of this analysis type is the simulation of heat exchangers, cooling of electronic equipment, and general-purpose cooling and heating systems.

2.

# Baseline mesh

number of cells = 137729

Temperature contour:

Velocity contour:

heat transfer on the wall:

# Finer mesh

number of cells = 508932

Temperature contour:

Velocity contour:

heat transfer on the wall:

#Comments

Results in the 2 cases are slightly different, first of all the velocity is better predicted in the finer mesh, as well as the temperature distribution. In the finer mesh as well the presence of a boundary layer increases the accuracy of the heat transfer prediction.

3.

A first good criteria would be checking the consistency of the simulation. Where velocity is higher (i.e. high Reynolds number), or wherese turbolence appears, higher HTC is expected. In case this is not happening the simulation may be wrong.

Another idea would be checking the mesh consistency, if similar, but slightly different results are obtained, solution is grid independent, so at least the error is not in meshing.