Question

Which of these ways can be used to overcome stream-wise numerical diffusion?

(a) Decreasing the order of interpolation

(b) Increasing the order of interpolation

(c) Increasing the number of neighbours considered

(d) Decreasing the number of neighbours considered

The question was posed to me in an internship interview.

My question is taken from Convection-Diffusion Problems in division Convection-Diffusion Problems of Computational Fluid Dynamics

Answer 1

The correct option is (b) Increasing the order of interpolation

Explanation: The numerical diffusion error can be further divided into two – stream-wise and cross-stream numerical diffusions. The stream-wise numerical diffusion can be reduced by using a higher-order interpolation profile.