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