Question

Errors are transferred from a fine grid to a coarser one. Similarly __________ is transferred from a coarse grid to a finer one.

(a) residual

(b) correction

(c) restriction

(d) prolongation

This question was addressed to me in homework.

My doubt is from Numerical Methods topic in division Numerical Methods of Computational Fluid Dynamics

Answer 1

Correct answer is (b) correction

Easiest explanation: Corrections are transferred from a coarse grid to a finer one. Correction is basically obtained from the solution of the system of equations at the coarse grid. This, in terms of ratios of errors, is transferred to the finer grid.