Question

Which of these could be an optimal mesh?

(a) Non-uniform

(b) Uniform

(c) Grids with increasing lengths

(d) Grids with decreasing lengths

The question was asked in a national level competition.

My query is from CFD Solution Procedure in section Philosophy of Computational Fluid Dynamics of Computational Fluid Dynamics

Answer 1

The correct answer is (a) Non-uniform

The explanation is: A uniform grid has all the cells with the same dimensions. The flow properties may not vary uniformly in the domain. Therefore, a non-uniform grid with more cells in the areas with large variations is an optimal way of grid generation.