CPCE CFD Software & Simulation Techniques 2

Question 1

In ANSYS Fluent, which discretization scheme is typically recommended for achieving second-order accuracy in convection terms?

Accepted Answer

Second-order upwind

Answer

First-order upwind

Answer

Power law

Answer

Central differencing

Question 2

Which CFD software uses the OpenFOAM framework as its underlying solver engine?

Accepted Answer

SimScale

Answer

STAR-CCM+

Answer

ANSYS CFX

Answer

Fluent

Question 3

What does the term 'AMG' stand for in the context of CFD iterative solvers?

Accepted Answer

Algebraic MultiGrid

Answer

Adaptive Mesh Generation

Answer

Automatic Mesh Gradation

Answer

Anisotropic Mesh Grading

Question 4

In OpenFOAM, what is the purpose of the 'fvSolution' dictionary?

Accepted Answer

Specifies linear solvers and convergence tolerances

Answer

Defines mesh refinement levels

Answer

Sets boundary condition types

Answer

Controls time-stepping parameters

Question 5

Which technique is used in CFD to handle moving boundaries or rotating machinery by allowing mesh blocks to slide past each other?

Accepted Answer

Sliding mesh interface

Answer

Overset (Chimera) mesh

Answer

Adaptive mesh refinement

Answer

Polyhedral meshing

Question 6

What is the primary advantage of using hex-dominant meshing over fully tetrahedral meshing in structured flow regions?

Accepted Answer

Lower cell count for equivalent accuracy

Answer

Easier surface mesh generation

Answer

Reduced solver memory requirements

Answer

Better handling of complex geometry

Question 7

In the SIMPLE algorithm, what does the pressure correction equation enforce?

Accepted Answer

Continuity (mass conservation)

Answer

Momentum conservation

Answer

Energy conservation

Answer

Turbulence kinetic energy balance