Question

According to the explicit time-advanced method for getting pressure, which of these is correct?

(a) Continuity is enforced at the previous step after starting to solve the current step

(b) Momentum conservation is enforced at the previous step after starting to solve the current step

(c) Momentum equation is enforced at each step before moving to the next step

(d) Continuity is enforced before at each step moving to the next step

The question was asked in semester exam.

This is a very interesting question from Incompressible Flows topic in portion Incompressible Flows & Compressible Flows of Computational Fluid Dynamics

Answer 1

Correct choice is (d) Continuity is enforced before at each step moving to the next step

Explanation: The divergence of the velocity field at the current step should be made zero. For this, the divergence of the velocity field at the previous step must be zero. So, continuity is zero at each step before moving to the next step.