Question

What is the method used in CFD to solve partial differential equations?

(a) Variable separation

(b) Method of characteristics

(c) Change of variables

(d) Discretization

The question was asked during an interview for a job.

My question is from Partial Differential Equation topic in section Mathematical Behaviour of Partial Differential Equations of Computational Fluid Dynamics

Answer 1

Right answer is (d) Discretization

The explanation: In CFD, partial differential equations are discretized using Finite difference or Finite volume methods. These discretized equations are coupled and they are solved simultaneously to get the flow variables.