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. |
LES Reynolds stresses are caused by ____________ |
| A. | Source term |
| B. | Resolved flow |
| C. | SGS eddies |
| D. | Diffusion term |
| Answer» D. Diffusion term | |
| 2. |
Cross-stresses are caused by ___________ |
| A. | Convection term |
| B. | Resolved flow |
| C. | SGS eddies |
| D. | Interaction of SGS eddies and resolved flow |
| Answer» E. | |
| 3. |
Leonard stresses are caused by ____________ |
| A. | The SGS eddies |
| B. | The effects at the resolved scale |
| C. | The effects of the unresolved variables |
| D. | The combined effect of the SGS eddies and the resolved scale |
| Answer» C. The effects of the unresolved variables | |
| 4. |
If a flow variable can be resolved by spatial LES filtering as and . Expand the term ( rho overline{u_iu_j} ). |
| A. | ( rho overline{ overline{u_i} overline{u_j}} + rho overline{ overline{u_i}u_j^{ }} + rho overline{u_i^{ } overline{u_j}} ) |
| B. | ( rho overline{ overline{u_i} overline{u_j}} + rho overline{u_i^{ }u_j^{ }} ) |
| C. | ( rho overline{ overline{u_i}u_j^{ }} + rho overline{u_i^{ } overline{u_j}} ) |
| D. | ( rho overline{ overline{u_i} overline{u_j}} + rho overline{ overline{u_i}u_j^{ }} + rho overline{u_i^{ } overline{u_j}}+ rho overline{u_i^{ }u_j^{ }} ) |
| Answer» E. | |
| 5. |
The SGS stresses are obtained from ___________ |
| A. | Reynolds stress term |
| B. | Convection term |
| C. | Source term |
| D. | Diffusion term |
| Answer» B. Convection term | |
| 6. |
Which of these terms corresponds to the cross stresses? |
| A. | ( rho overline{u_i^{ } overline{u_j}} ) |
| B. | ( rho overline{ overline{u_i}u_j^{ }} ) |
| C. | ( rho overline{ overline{u_i}u_j^{ }} + rho overline{u_i^{ } overline{u_j}} ) |
| D. | ( rho overline{ overline{u_i}u_j^{ }} , rho overline{u_i^{ } overline{u_j}} ) |
| Answer» D. ( rho overline{ overline{u_i}u_j^{ }} , rho overline{u_i^{ } overline{u_j}} ) | |
| 7. |
The stress term ( rho overline{u_i^{ }u_j^{ }} )is called as ____________ |
| A. | Filter Reynolds stress |
| B. | LES Reynolds stress |
| C. | Reynolds stress |
| D. | Sub-Reynolds stress |
| Answer» C. Reynolds stress | |
| 8. |
Identify Leonard stresses from the following. |
| A. | ( rho overline{ overline{u_i} overline{u_j}} , rho overline{u_i} overline{u_j} ) |
| B. | ( rho overline{ overline{u_i} overline{u_j}} ) |
| C. | ( rho overline{u_i} overline{u_j} ) |
| D. | ( rho overline{ overline{u_i} overline{u_j}} , rho overline{u_i} overline{u_j} ) |
| Answer» B. ( rho overline{ overline{u_i} overline{u_j}} ) | |
| 9. |
How many extra stress terms occur due to the LES filtering operation? |
| A. | No extra terms |
| B. | Four terms |
| C. | Three terms |
| D. | Two terms |
| Answer» D. Two terms | |
| 10. |
When is the LES filter commutative? |
| A. | When the filter function is unity |
| B. | When the filter function is quadratic |
| C. | When the filter function is isotropic |
| D. | When the filter function is uniform |
| Answer» E. | |