Question

Flow properties are not bounded by the boundary values __________

(a) in the absence of convection term

(b) in the absence of source term

(c) in the presence of source term

(d) in the absence of convection term

I got this question during an online exam.

This key question is from Discretization Aspects in section Basic Aspects of Discretization, Grid Generation with Appropriate Transformation of Computational Fluid Dynamics

Answer 1

Right choice is (c) in the presence of source term

For explanation I would say: When there is a source or sink inside the domain of interest, the flow properties may increase or decrease drastically. This may lead to a value which does not lie in the range of the boundary values. So, a system with a source or sink will not be bounded.