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. |
The cut-off width dependent on the finite volume grid size is equal to _____________ |
| A. | the square of the grid cell volume |
| B. | the cube of the grid cell volume |
| C. | the square root of the grid cell volume |
| D. | the cube root of the grid cell volume |
| Answer» E. | |
| 2. |
In FVM methods, cut-off width depends on ____________ |
| A. | the PDE |
| B. | the algebraic equation |
| C. | the grid-size |
| D. | the discretization method |
| Answer» D. the discretization method | |
| 3. |
Which of these filters is commonly used in FVM models? |
| A. | Gaussian filter |
| B. | Top-hat filter |
| C. | Spectral cut-off filter |
| D. | Gaussian and spectral cut-off filter |
| Answer» C. Spectral cut-off filter | |
| 4. |
Which of these is the spectral cut-off filter function? |
| A. | ( prod_{i=1}^3 frac{sin[(x_i-x_i^{ })/ Delta]}{(x_i-x_i^{ })} ) |
| B. | ( prod_{i=1}^3 sin[(x_i-x_i^{ })/ Delta] ) |
| C. | ( prod_{i=1}^3 frac{sin[(x_i-x_i^{ })]}{(x_i-x_i^{ })} ) |
| D. | ( prod_{i=1}^3 sin[(x_i-x_i^{ })/ Delta] ) |
| Answer» B. ( prod_{i=1}^3 sin[(x_i-x_i^{ })/ Delta] ) | |
| 5. |
Which of these represent the Gaussian filter function? |
| A. | (( frac{ gamma}{ pi Delta^2})^{ frac{3}{2}} exp(- gamma big| vec x, vec{x } big|) ) |
| B. | (( frac{ gamma}{ pi Delta^2})^{ frac{3}{2}} exp(- gamma frac{ big| vec x, vec{x } big|}{ Delta}) ) |
| C. | (( frac{ gamma}{ Delta^2})^{ frac{3}{2}} exp(- gamma frac{ big| vec x, vec{x } big|^2}{ Delta^2}) ) |
| D. | (( frac{ gamma}{ pi Delta^2})^{ frac{3}{2}} exp(- gamma frac{ big| vec x, vec{x } big|^2}{ Delta^2}) ) |
| Answer» E. | |
| 6. |
What is the other name of the top-hat filter? |
| A. | Cross filter |
| B. | Cube filter |
| C. | Box filter |
| D. | Square filter |
| Answer» D. Square filter | |
| 7. |
Which of these will not come under the types of filter functions used by the LES model? |
| A. | Top-hat filter |
| B. | Leonard filter |
| C. | Gaussian filter |
| D. | Spectral cut-off |
| Answer» C. Gaussian filter | |
| 8. |
What does SGS stress stand for? |
| A. | Sub-grid-scale stress |
| B. | Suitable-grid-scale stress |
| C. | Suitable-grey-scale stress |
| D. | Sub-grey-scale stress |
| Answer» B. Suitable-grid-scale stress | |
| 9. |
LES uses _____________ |
| A. | spatial filtering |
| B. | time averaging |
| C. | ensemble averaging |
| D. | reynolds averaging |
| Answer» B. time averaging | |
| 10. |
LES is preferred when _____________ |
| A. | the flow is compressible |
| B. | the flow has a high Reynolds number |
| C. | the flow is turbulent |
| D. | the flow has heat transfers |
| Answer» C. the flow is turbulent | |