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

Second-order upwind scheme reduces numerical diffusion compared to first-order upwind by using a wider stencil for gradient reconstruction.

Question 2

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

Accepted Answer

SimScale

Answer

SimScale is a cloud-based CFD platform that uses OpenFOAM as its core solver for incompressible and compressible flow simulations.

Question 3

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

Accepted Answer

Algebraic MultiGrid

Answer

Algebraic MultiGrid (AMG) is a solver acceleration technique that coarsens the algebraic problem rather than the mesh, speeding convergence for large linear systems.

Question 4

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

Accepted Answer

Specifies linear solvers and convergence tolerances

Answer

The fvSolution dictionary in OpenFOAM specifies the linear algebra solvers, preconditioners, and convergence criteria for each transported quantity.

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

Sliding mesh interfaces allow adjacent mesh zones to rotate or translate relative to each other while exchanging flux information across the interface.

(CPCE) Certified Professional CFD Engineer Practice Test

(CPCE) Certified Professional CFD Engineer Practice Test

CPCE CFD Software & Simulation Techniques 2