CPCE CFD Software & Simulation Techniques 3

Question 1

Which ANSYS meshing tool is specifically designed for high-quality boundary layer mesh generation around aerodynamic surfaces?

Accepted Answer

ICEM CFD

Answer

ANSYS ICEM CFD provides advanced blocking and structured hexahedral meshing capabilities particularly suited for boundary layer-resolved aerodynamic simulations.

Question 2

In STAR-CCM+, what is the function of the 'Continua' node in the simulation tree?

Accepted Answer

Defines physics models and material properties

Answer

The Continua node in STAR-CCM+ groups physics continua (fluid, solid) and their associated models, equations of state, and material properties.

Question 3

What is 'wall function' approach in turbulence modeling used to avoid?

Accepted Answer

Resolving the laminar sub-layer with fine mesh

Answer

Wall functions use semi-empirical correlations to bridge the laminar sub-layer, avoiding the computational expense of resolving it with a very fine near-wall mesh (y+~1).

Question 4

Which OpenFOAM solver would you use for a steady-state incompressible turbulent flow simulation?

Accepted Answer

simpleFoam

Answer

simpleFoam is OpenFOAM's steady-state incompressible solver using the SIMPLE algorithm, suitable for turbulent flows with RANS models.

Question 5

In CFD post-processing, what is a 'Q-criterion' isosurface used to visualize?

Accepted Answer

Vortical structures in turbulent flow

Answer

Q-criterion identifies vortical structures where the rotation rate dominates strain rate (Q > 0), making it a standard tool for turbulence vortex visualization.

(CPCE) Certified Professional CFD Engineer Practice Test

(CPCE) Certified Professional CFD Engineer Practice Test

CPCE CFD Software & Simulation Techniques 3