Question

Adaptive grids change automatically based on ______________

(a) flow field gradients

(b) time rate of change of the flow properties

(c) grid gradients

(d) time rate of change of the grid points

This question was posed to me during an interview.

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

Answer 1

Right choice is (a) flow field gradients

Explanation: Adaptive grids are the one which can automatically adapt their arrangement based on the needs of the problem. This is based on the flow-field gradients. High flow-field gradients indicate a sudden variation of properties based on spatial coordinates. So, more grids are automatically generated there.