MCQOPTIONS
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MCQOPTIONS
This section includes 10 Mcqs, each offering curated multiple-choice questions to sharpen your Computational Fluid Dynamics knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
Which of these methods which are used for time advance discretization in DNS needs more computation per time step? |
| A. | Adams-Bashforth |
| B. | Runge-Kutta method |
| C. | Leapfrog |
| D. | Newton Raphson method |
| Answer» C. Leapfrog | |
| 2. |
The Reynolds number of a 3-D turbulent flow is 104. What is the number of time-steps needed? |
| A. | 100 |
| B. | 1000 |
| C. | 10<sup>4</sup> |
| D. | 10<sup>5</sup> |
| Answer» B. 1000 | |
| 3. |
The Reynolds number of a 3-D turbulent flow is 104. What is the number of grid points needed? |
| A. | 10<sup>3</sup> |
| B. | 10<sup>4</sup> |
| C. | 10<sup>6</sup> |
| D. | 10<sup>9</sup> |
| Answer» E. | |
| 4. |
Which of these is the simplest type of turbulent flows? |
| A. | Homogeneous anisotropic turbulence |
| B. | Incompressible turbulent flows |
| C. | Homogeneous isotropic turbulence |
| D. | Compressible turbulent flows |
| Answer» D. Compressible turbulent flows | |
| 5. |
DNS method is applicable for __________ |
| A. | Complex geometry and low Reynolds number |
| B. | Simple geometry and low Reynolds number |
| C. | Simple geometry and high Reynolds number |
| D. | Complex geometry and high Reynolds number |
| Answer» C. Simple geometry and high Reynolds number | |
| 6. |
For which of these purposes, the DNS method is not suitable? |
| A. | Designing |
| B. | Simulation of the production of aerodynamic noise |
| C. | Effects of compressibility on turbulence |
| D. | To understand the mechanism of turbulence |
| Answer» B. Simulation of the production of aerodynamic noise | |
| 7. |
When is the DNS method apt? |
| A. | For complex flows |
| B. | For design purposes |
| C. | For precise details |
| D. | For economic simulation |
| Answer» D. For economic simulation | |
| 8. |
The grid size and time-step size of the DNS method depends upon the _____________ |
| A. | Schmidt number |
| B. | Peclet number |
| C. | Nusselt number |
| D. | Reynolds number |
| Answer» E. | |
| 9. |
DNS can solve _____________ |
| A. | transient 3-D equations |
| B. | steady-state 3-D equations |
| C. | transient 2-D equations |
| D. | steady-state 2-D equations |
| Answer» B. steady-state 3-D equations | |
| 10. |
Which of these equations is the starting point of the DNS method? |
| A. | Continuity and momentum equations of homogeneous turbulent flow |
| B. | Continuity and momentum equations of incompressible turbulent flow |
| C. | Momentum and energy equations of incompressible turbulent flow |
| D. | Momentum and energy equations of homogeneous turbulent flow |
| Answer» C. Momentum and energy equations of incompressible turbulent flow | |