Question

The explicit method is preferred when __________

(a) an accurate velocity field is needed

(b) the pressure value is needed

(c) an accurate time history of the flow is needed

(d) only less memory is available

This question was addressed to me by my college director while I was bunking the class.

My question is based upon Incompressible Flows topic in chapter Incompressible Flows & Compressible Flows of Computational Fluid Dynamics

Answer 1

Correct option is (c) an accurate time history of the flow is needed

Explanation: Explicit methods are used to solve the Navier-Stokes equations when accurate time history of the flow variables is needed. The explicit time advancement method is more accurate than the first-order Euler method.