- 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) Circulating fluid diagram
C) Computational fluid dynamics
D) Complex fuel dynamics
- 2. Which governing equations are solved in CFD simulations?
A) Navier-Stokes equations
B) Schrodinger's equations
C) Maxwell's equations
D) Euler's equations
- 3. What is the purpose of meshing in CFD simulations?
A) To calculate pressure
B) To discretize the domain
C) To model turbulence
D) To generate reports
- 4. What is turbulence modeling in CFD?
A) Modeling different fluids
B) Designing sleek aerodynamics
C) Studying static flow patterns
D) Simulation of turbulent flow behavior
- 5. What does a convergent solution in CFD imply?
A) Divergence of the simulation
B) Stable and accurate results
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) Steady flow
B) Laminar flow
C) Turbulent flow
D) Transitional flow
- 7. Which term describes the maximum rate at which information can propagate in a fluid domain?
A) Peclet number
B) Courant number
C) Mach number
D) Reynolds number
- 8. Which fluid property is crucial for accurate CFD simulations?
A) Pressure
B) Density
C) Temperature
D) Viscosity
- 9. What is the primary purpose of post-processing in CFD simulations?
A) Define boundary conditions
B) Generate mesh files
C) Select turbulence models
D) Analyze and visualize simulation results
- 10. What is the CFL condition in numerical simulations?
A) Stability criterion for time step size
B) Boundary condition specification
C) Grid resolution requirement
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) Ensure accuracy of the simulation results
D) Increase the mesh resolution
- 12. What is the difference between steady-state and transient simulations in CFD?
A) Higher mesh resolution in steady-state simulations
B) Inapplicability of boundary conditions in steady-state simulations
C) Turbulence model selection in transient simulations
D) Time-dependence of flow in transient simulations
- 13. Which method is commonly used to discretize the governing equations for numerical solutions in CFD?
A) Spectral method
B) Finite difference method
C) Finite volume method
D) Finite element method
- 14. Which term describes the phenomenon of fluid particles having a chaotic motion with no predictable behavior?
A) Viscosity
B) Turbulence
C) Steady state
D) Laminar flow
- 15. Which term describes the ratio of inertial forces to viscous forces in a fluid flow?
A) Mach number
B) Strouhal number
C) Froude number
D) Reynolds number
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