Can you please elaborate perhaps by sharing some illustrations?
Effect of mesh on HTC can be understand through grid independence test.
It is a difficult process to choose a mesh for the CFD computations. A mesh that is too coarse will result in large errors; an overly fine mesh will be costly in computing time. To demonstrate the impact of the mesh size on the calculation results, any CFD simulation should be accompanied by a grid sensitivity analysis.
For the purposes of the grid sensitivity analysis, the convective heat transfer coefficients (HTC) should be calculated and compared for different grid densities.
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