Question

Which of these analyses needs a stretched grid?

(a) Transient flow over a flat plate

(b) Incompressible flow over a flat plate

(c) Viscous flow over a flat plate

(d) Subsonic flow over a flat plate

The question was asked in unit test.

The doubt is from Discretization Aspects topic in division Basic Aspects of Discretization, Grid Generation with Appropriate Transformation of Computational Fluid Dynamics

Answer 1

Correct option is (c) Viscous flow over a flat plate

To elaborate: A stretched grid has less grid spacing in one side of the domain and stretched in the other side. For viscous flow over a flat plate, the boundary layer will have much variations of the flow properties than the far regions. So, for modelling this, stretched grids can be used.