Question

Which of these relaxation techniques is used in the SIMPLE algorithm?

(a) Explicit over-relaxation

(b) Implicit over-relaxation

(c) Explicit under-relaxation

(d) Implicit under-relaxation

This question was posed to me by my school teacher while I was bunking the class.

This question is from Under-Relaxation topic in division Discretization of the Source Term & Relaxation of Computational Fluid Dynamics

Answer 1

Correct answer is (c) Explicit under-relaxation

The explanation is: The very common algorithm which uses the relaxation technique is the SIMPLE algorithm. It uses the explicit under-relaxation technique to decrease the effect of the correction factors in the pressure and velocity correction equations.