CFD Software & Simulation Techniques Flashcards
7 cards from real CPCE practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 7 CFD Software & Simulation Techniques flashcards as text
In ANSYS Fluent, which discretization scheme is typically recommended for achieving second-order accuracy in convection terms?
Answer: Second-order upwind
Second-order upwind scheme reduces numerical diffusion compared to first-order upwind by using a wider stencil for gradient reconstruction.
Which CFD software uses the OpenFOAM framework as its underlying solver engine?
Answer: SimScale
SimScale is a cloud-based CFD platform that uses OpenFOAM as its core solver for incompressible and compressible flow simulations.
What does the term 'AMG' stand for in the context of CFD iterative solvers?
Answer: Algebraic MultiGrid
Algebraic MultiGrid (AMG) is a solver acceleration technique that coarsens the algebraic problem rather than the mesh, speeding convergence for large linear systems.
In OpenFOAM, what is the purpose of the 'fvSolution' dictionary?
Answer: Specifies linear solvers and convergence tolerances
The fvSolution dictionary in OpenFOAM specifies the linear algebra solvers, preconditioners, and convergence criteria for each transported quantity.
Which technique is used in CFD to handle moving boundaries or rotating machinery by allowing mesh blocks to slide past each other?
Answer: Sliding mesh interface
Sliding mesh interfaces allow adjacent mesh zones to rotate or translate relative to each other while exchanging flux information across the interface.
What is the primary advantage of using hex-dominant meshing over fully tetrahedral meshing in structured flow regions?
Answer: Lower cell count for equivalent accuracy
Hexahedral cells align with the flow direction and require fewer cells to achieve equivalent accuracy compared to tetrahedral cells, reducing computational cost.
In the SIMPLE algorithm, what does the pressure correction equation enforce?
Answer: Continuity (mass conservation)
In SIMPLE, the pressure correction equation is derived from the continuity equation to ensure that the velocity field satisfies mass conservation after each iteration.