Computational Fluid Dynamics MCQs December 4, 2025August 23, 2024 by u930973931_answers 20 min Score: 0 Attempted: 0/20 Subscribe 1. #1: What is Computational Fluid Dynamics (CFD)? (A) A branch of mechanics that studies fluids in motion (B) A numerical technique for solving fluid flow problems using computers (C) A method for measuring fluid properties experimentally (D) A theoretical approach to fluid mechanics 2. What does the Navier-Stokes equation describe? (A) The behavior of solid materials under stress (B) The relationship between pressure and temperature (C) The motion of fluid substances (D) The diffusion of heat in solids 3. Which type of grid is most commonly used in CFD for structured meshes? (A) Cartesian grid (B) Polar grid (C) Curvilinear grid (D) Unstructured grid 4. What is the main purpose of meshing in CFD? (A) To solve differential equations analytically (B) To break the computational domain into smaller elements (C) To measure fluid flow directly (D) To simplify the physical model 5. Which numerical method is commonly used to solve the Navier-Stokes equations in CFD? (A) Finite Volume Method (FVM) (B) Finite Difference Method (FDM) (C) Finite Element Method (FEM) (D) Boundary Element Method (BEM) 6. What does the term âconvergenceâ refer to in CFD? (A) The accuracy of the initial conditions (B) The numerical solution approaching a stable solution (C) The agreement between experimental and theoretical results (D) The resolution of the computational mesh 7. What is âturbulence modelingâ in CFD used for? (A) To simulate laminar flow accurately (B) To analyze the structural integrity of materials (C) To predict the behavior of turbulent fluid flow (D) To simplify the boundary conditions 8. Which turbulence model is commonly used in engineering applications? (A) Direct Numerical Simulation (DNS) (B) Reynolds Averaged Navier-Stokes (RANS) Model (C) k-Δ Model (D) Large Eddy Simulation (LES) 9. What is the purpose of boundary conditions in CFD simulations? (A) To define the shape of the computational domain (B) To set the initial fluid properties (C) To specify the behavior of the fluid at the boundaries of the domain (D) To determine the mesh size 10. What is âgrid refinementâ in CFD? (A) Reducing the number of grid cells in the computational domain (B) Changing the shape of the computational domain (C) Increasing the number of grid cells to improve accuracy (D) Modifying the boundary conditions 11. What is the role of âpressure-velocity couplingâ in CFD solvers? (A) To ensure that the continuity equation is satisfied (B) To solve the equations of state (C) To enhance turbulence modeling (D) To improve computational speed 12. What does âmesh qualityâ refer to in CFD? (A) The speed of the solver (B) The precision of boundary conditions (C) The uniformity and accuracy of the computational grid (D) The complexity of the physical model 13. What is the purpose of âpost-processingâ in CFD? (A) To generate the computational mesh (B) To visualize and analyze the results of the simulation (C) To set up initial conditions (D) To define boundary conditions 14. What does the term âstaggered gridâ mean in CFD? (A) A grid with irregular cell sizes (B) A grid with uniform spacing between cells (C) A grid where variables are stored at different locations (D) A grid with overlapping cells 15. What is âadaptive meshingâ in CFD? (A) A way to optimize boundary conditions (B) A technique to manually adjust mesh density (C) A process to create a uniform mesh (D) A method to automatically refine the mesh based on solution gradients 16. What is âflow visualizationâ used for in CFD? (A) To generate the computational mesh (B) To examine how the fluid flows through the domain (C) To set up boundary conditions (D) To solve the Navier-Stokes equations 17. What does the âcontinuity equationâ ensure in fluid dynamics? (A) Conservation of mass (B) Conservation of energy (C) Conservation of momentum (D) Conservation of heat 18. What is âdirect numerical simulationâ (DNS) used for in CFD? (A) To model large-scale turbulence (B) To solve flow problems with high accuracy without turbulence modeling (C) To simplify complex geometries (D) To approximate the solution for engineering applications 19. What is the âfinite element methodâ (FEM) commonly used for in CFD? (A) To solve complex fluid dynamics problems (B) To visualize flow patterns (C) To generate computational meshes (D) To model structural mechanics problems 20. What is the âfinite difference methodâ (FDM) used for? (A) To visualize CFD results (B) To create complex geometries (C) To solve differential equations by approximating derivatives (D) To generate high-quality meshes