Question

Which of these is correct for the implicit method of solving pressure in the compressible flows?

(a) The Poisson equation alone is solved

(b) The Poisson equation and the momentum equation are solved simultaneously

(c) The momentum equation is solved first

(d) The Poisson equation is solved first

This question was addressed to me in quiz.

The above asked question is from Incompressible Flows in section Incompressible Flows & Compressible Flows of Computational Fluid Dynamics

Answer 1

Correct choice is (b) The Poisson equation and the momentum equation are solved simultaneously

To explain: In the implicit method, the values in the previous time steps are altered after moving to the next step. The Poisson equation and the momentum equation are solved simultaneously here. No time-advancement is done here.