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

SpaceClaim

Answer

DesignModeler

Answer

TurboGrid

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

Manages post-processing scenes

Answer

Controls solver iteration settings

Answer

Sets mesh size parameters

Question 3

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

Accepted Answer

Resolving the laminar sub-layer with fine mesh

Answer

Computing turbulent kinetic energy

Answer

Applying periodic boundary conditions

Answer

Modeling heat transfer in solids

Question 4

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

Accepted Answer

simpleFoam

Answer

icoFoam

Answer

rhoCentralFoam

Answer

interFoam

Question 5

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

Accepted Answer

Vortical structures in turbulent flow

Answer

Shock wave locations

Answer

Pressure coefficient distribution

Answer

Wall shear stress regions

Question 6

What is the purpose of 'under-relaxation factors' in steady-state CFD solvers like SIMPLE?

Accepted Answer

Damp updates to flow variables to prevent divergence

Answer

Increase time step size for faster convergence

Answer

Refine mesh automatically near high-gradient regions

Answer

Switch between first and second-order schemes

Question 7

Which meshing strategy is most appropriate for capturing tip vortex flows in rotating turbomachinery?

Accepted Answer

Conformal polyhedral mesh with tip gap refinement

Answer

Uniform Cartesian mesh

Answer

Surface extrusion only

Answer

2D axisymmetric mesh