Question

When the Peclet number is zero, the value of flow property at the current node is influenced by ___________

(a) the upstream node more

(b) both the upstream and downstream nodes equally

(c) the downstream node more

(d) neither the upstream nor the downstream nodes

I got this question in an internship interview.

My doubt is from Discretization Aspects topic in division Basic Aspects of Discretization, Grid Generation with Appropriate Transformation of Computational Fluid Dynamics

Answer 1

Correct option is (b) both the upstream and downstream nodes equally

To explain: When the Peclet number (convection) is zero, flow direction does not affect the value of flow property. Both the upstream and the downstream nodes have equal influence on the value at the current node.