- 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) Computational fluid dynamics
B) Complex fuel dynamics
C) Computer fluid descriptors
D) Circulating fluid diagram
- 2. Which governing equations are solved in CFD simulations?
A) Euler's equations
B) Navier-Stokes equations
C) Maxwell's equations
D) Schrodinger's equations
- 3. What is the purpose of meshing in CFD simulations?
A) To discretize the domain
B) To model turbulence
C) To generate reports
D) To calculate pressure
- 4. What is turbulence modeling in CFD?
A) Modeling different fluids
B) Designing sleek aerodynamics
C) Simulation of turbulent flow behavior
D) Studying static flow patterns
- 5. What does a convergent solution in CFD imply?
A) Inefficiency of the solver
B) Divergence of the simulation
C) Random fluctuation in outcomes
D) Stable and accurate results
- 6. What type of flow is characterized by a Reynolds number less than 2300?
A) Transitional flow
B) Turbulent flow
C) Laminar 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) Convergence rate calculation
C) Stability criterion for time step size
D) Boundary condition specification
- 9. What is the primary purpose of post-processing in CFD simulations?
A) Select turbulence models
B) Generate mesh files
C) Analyze and visualize simulation results
D) Define boundary conditions
- 10. Which fluid property is crucial for accurate CFD simulations?
A) Density
B) Pressure
C) Temperature
D) Viscosity
- 11. What is the difference between steady-state and transient simulations in CFD?
A) Turbulence model selection in transient simulations
B) Higher mesh resolution in steady-state simulations
C) Inapplicability of boundary conditions in steady-state simulations
D) Time-dependence of flow 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) Reynolds number
B) Froude number
C) Mach number
D) Strouhal number
- 14. Which term describes the phenomenon of fluid particles having a chaotic motion with no predictable behavior?
A) Viscosity
B) Turbulence
C) Laminar flow
D) Steady state
- 15. Which term describes the maximum rate at which information can propagate in a fluid domain?
A) Reynolds number
B) Peclet number
C) Mach number
D) Courant number
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