Question

Over 50% of the time spent in the industry on a CFD project is devoted to the definition of the domain geometry and grid generation. Which one will be the reason for this?

(a) More grids will give better results

(b) Calculation time is directly proportional to the number of cells

(c) To generate non-uniform grids

(d) To generate an optimal grid which is a compromise between desired accuracy and solution cost

The question was posed to me in a job interview.

I would like to ask this question from CFD Solution Procedure in portion Philosophy of Computational Fluid Dynamics of Computational Fluid Dynamics

Answer 1

The correct option is (d) To generate an optimal grid which is a compromise between desired accuracy and solution cost

The explanation: Accuracy of a CFD solution directly depends on the number of grids. On the other hand, if there are more grids, the cost of computation will increase. To overcome this, a grid which is a compromise between both of these should be generated. So, a lot of time is spent on grid generation.