Computational fluid dynamics - Exam
- 1. Computational fluid dynamics (CFD) is a branch of fluid mechanics that utilizes numerical analysis and algorithms to solve and analyze problems that involve fluid flows. It involves simulating the behavior of fluid flows, such as liquid or gas, using computer software and mathematical modeling. CFD is widely used in various industries, including aerospace, automotive, and environmental engineering, to predict and optimize the performance of designs, simulate complex fluid flow phenomena, and study the behavior of fluids in different conditions. By dividing the fluid domain into a grid of small elements and solving complex equations governing fluid motion and properties, CFD enables engineers and researchers to gain insights into fluid flow behavior that would be difficult or impossible to obtain experimentally. Overall, computational fluid dynamics plays a critical role in advancing the understanding and improvement of fluid flow systems and processes.
What does CFD stand for?
A) Computer fluid descriptors
B) Complex fuel dynamics
C) Circulating fluid diagram
D) Computational fluid dynamics
- 2. Which governing equations are solved in CFD simulations?
A) Schrodinger's equations
B) Euler's equations
C) Maxwell's equations
D) Navier-Stokes equations
- 3. What is the purpose of meshing in CFD simulations?
A) To discretize the domain
B) To generate reports
C) To calculate pressure
D) To model turbulence
- 4. What is turbulence modeling in CFD?
A) Simulation of turbulent flow behavior
B) Designing sleek aerodynamics
C) Modeling different fluids
D) Studying static flow patterns
- 5. What does a convergent solution in CFD imply?
A) Stable and accurate results
B) Divergence of the simulation
C) Inefficiency of the solver
D) Random fluctuation in outcomes
- 6. What type of flow is characterized by a Reynolds number less than 2300?
A) Laminar flow
B) Steady flow
C) Transitional flow
D) Turbulent flow
- 7. Which term describes the maximum rate at which information can propagate in a fluid domain?
A) Peclet number
B) Mach number
C) Reynolds number
D) Courant number
- 8. Which fluid property is crucial for accurate CFD simulations?
A) Viscosity
B) Temperature
C) Pressure
D) Density
- 9. What is the primary purpose of post-processing in CFD simulations?
A) Generate mesh files
B) Define boundary conditions
C) Select turbulence models
D) Analyze and visualize simulation results
- 10. What is the CFL condition in numerical simulations?
A) Grid resolution requirement
B) Boundary condition specification
C) Stability criterion for time step size
D) Convergence rate calculation
- 11. What is the purpose of a validation study in CFD?
A) Speed up the computation
B) Ignore boundary conditions
C) Increase the mesh resolution
D) Ensure accuracy of the simulation results
- 12. What is the difference between steady-state and transient simulations in CFD?
A) Higher mesh resolution in steady-state simulations
B) Time-dependence of flow in transient simulations
C) Turbulence model selection in transient simulations
D) Inapplicability of boundary conditions in steady-state simulations
- 13. Which method is commonly used to discretize the governing equations for numerical solutions in CFD?
A) Spectral method
B) Finite volume method
C) Finite element method
D) Finite difference method
- 14. Which term describes the phenomenon of fluid particles having a chaotic motion with no predictable behavior?
A) Viscosity
B) Laminar flow
C) Turbulence
D) Steady state
- 15. Which term describes the ratio of inertial forces to viscous forces in a fluid flow?
A) Froude number
B) Reynolds number
C) Mach number
D) Strouhal number
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