- 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) Circulating fluid diagram
B) Computational fluid dynamics
C) Complex fuel dynamics
D) Computer fluid descriptors
- 2. Which governing equations are solved in CFD simulations?
A) Maxwell's equations
B) Euler's equations
C) Schrodinger'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) Studying static flow patterns
B) Modeling different fluids
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) Laminar flow
B) Turbulent flow
C) Transitional flow
D) Steady flow
- 7. What is the purpose of a validation study in CFD?
A) Ensure accuracy of the simulation results
B) Ignore boundary conditions
C) Increase the mesh resolution
D) Speed up the computation
- 8. 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
- 9. What is the primary purpose of post-processing in CFD simulations?
A) Analyze and visualize simulation results
B) Generate mesh files
C) Define boundary conditions
D) Select turbulence models
- 10. Which fluid property is crucial for accurate CFD simulations?
A) Viscosity
B) Density
C) Temperature
D) Pressure
- 11. What is the difference between steady-state and transient simulations in CFD?
A) Time-dependence of flow in transient simulations
B) Higher mesh resolution in steady-state simulations
C) Inapplicability of boundary conditions in steady-state simulations
D) Turbulence model selection in transient simulations
- 12. Which method is commonly used to discretize the governing equations for numerical solutions in CFD?
A) Finite element method
B) Finite difference method
C) Spectral method
D) Finite volume method
- 13. Which term describes the ratio of inertial forces to viscous forces in a fluid flow?
A) Mach number
B) Froude number
C) Strouhal number
D) Reynolds number
- 14. Which term describes the phenomenon of fluid particles having a chaotic motion with no predictable behavior?
A) Viscosity
B) Laminar flow
C) Steady state
D) Turbulence
- 15. Which term describes the maximum rate at which information can propagate in a fluid domain?
A) Mach number
B) Reynolds number
C) Courant number
D) Peclet number
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