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. Supersonic flow over a flat plate

Hint:

Using stretched grids in CFD can significantly improve the accuracy of simulations involving high-speed flows and complex fluid dynamics.

Answer 1

The Correct Option is D

Step 1: Understand Stretched Grids.
A stretched grid in computational fluid dynamics (CFD) is used to refine the mesh in regions of high gradient to capture the physics accurately without excessive computational cost.
Step 2: Identify the Need for Stretched Grids.
In supersonic flows, especially over a flat plate, shock waves and boundary layer effects create regions of high gradient. A stretched grid helps resolve these features accurately.