Question

Non-conservative schemes produce ___________

(a) artificial radiation

(b) artificial diffusion

(c) artificial convection

(d) artificial source or sink

The question was posed to me during an online interview.

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

Answer 1

Right answer is (d) artificial source or sink

The explanation is: Non-conservative schemes do not have the net fluxes conserved. In the global domain, the fluxes entering the domain and that leaving the domain are not the same. This will create artificial sources and sinks which do not actually exist in the physical problem.