Question

The extra term in the pressure-correction equation of the compressible flows ___________

(a) density-correction field

(b) pressure-correction field

(c) velocity-correction field

(d) viscosity-correction field

This question was addressed to me during an internship interview.

This question is from Compressible Flows topic in portion Incompressible Flows & Compressible Flows of Computational Fluid Dynamics

Answer 1

In the context of compressible flows and the pressure-correction equation used in Computational Fluid Dynamics (CFD), the extra term that is introduced to account for pressure corrections is the density-correction field. This term is used in compressible flow solvers to handle the variation in density, which can significantly affect the flow dynamics, particularly when the flow is highly compressible.

Here’s an explanation of the options:

• (a) Density-correction field: Correct. The density-correction field is an additional term used to adjust the density in the pressure-correction equation, ensuring that the solution remains consistent with the mass conservation in compressible flows.

• (b) Pressure-correction field: This term refers to the corrected pressure field in the solution process but is not the "extra" term added to the pressure-correction equation.

• (c) Velocity-correction field: While velocity corrections are important in CFD, they are not part of the "extra" term in the pressure-correction equation for compressible flows.

• (d) Viscosity-correction field: This term would relate to adjustments made for viscosity effects, but it is not the extra term in the context of the pressure-correction equation.

Correct Answer: (a) Density-correction field