- 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) Complex fuel dynamics
B) Computer fluid descriptors
C) Computational fluid dynamics
D) Circulating fluid diagram
- 2. Which governing equations are solved in CFD simulations?
A) Maxwell's equations
B) Euler's equations
C) Navier-Stokes equations
D) Schrodinger's equations
- 3. What is the purpose of meshing in CFD simulations?
A) To calculate pressure
B) To model turbulence
C) To generate reports
D) To discretize the domain
- 4. What is turbulence modeling in CFD?
A) Modeling different fluids
B) Studying static flow patterns
C) Simulation of turbulent flow behavior
D) Designing sleek aerodynamics
- 5. What does a convergent solution in CFD imply?
A) Random fluctuation in outcomes
B) Stable and accurate results
C) Divergence of the simulation
D) Inefficiency of the solver
- 6. What type of flow is characterized by a Reynolds number less than 2300?
A) Turbulent flow
B) Laminar flow
C) Transitional flow
D) Steady flow
- 7. Which term describes the maximum rate at which information can propagate in a fluid domain?
A) Courant number
B) Peclet number
C) Reynolds number
D) Mach number
- 8. Which fluid property is crucial for accurate CFD simulations?
A) Temperature
B) Pressure
C) Viscosity
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) Convergence rate calculation
C) Boundary condition specification
D) Stability criterion for time step size
- 11. What is the purpose of a validation study in CFD?
A) Speed up the computation
B) Increase the mesh resolution
C) Ignore boundary conditions
D) Ensure accuracy of the simulation results
- 12. What is the difference between steady-state and transient simulations in CFD?
A) Inapplicability of boundary conditions in steady-state simulations
B) Higher mesh resolution in steady-state simulations
C) Time-dependence of flow in transient simulations
D) Turbulence model selection in transient 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) Steady state
B) Turbulence
C) Laminar flow
D) Viscosity
- 15. Which term describes the ratio of inertial forces to viscous forces in a fluid flow?
A) Strouhal number
B) Froude number
C) Reynolds number
D) Mach number
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