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Which of these analyses needs a stretched grid?

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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
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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.
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