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. |
Let Cμ be a dimensionless constant and ρ be the density of the flow. Express the eddy dynamic viscosity in terms of k and ε. |
| A. | ρCμk2/ε |
| B. | ρCμ k/ε |
| C. | ρCμ ε/k |
| D. | ρCμ ε2/k |
| Answer» B. ρCμ k/ε | |
| 2. |
Express the large scale length in terms of k and ε. |
| A. | (k/ε)3/2 |
| B. | k3/2/ε |
| C. | ε/k3/2 |
| D. | (ε/k)3/2 |
| Answer» C. ε/k3/2 | |
| 3. |
Express the large scale velocity in terms of k and ε. |
| A. | ε1/2 |
| B. | (ε/k)1/2 |
| C. | k1/2 |
| D. | (k/ε)1/2 |
| Answer» D. (k/ε)1/2 | |
| 4. |
In high Reynolds number turbulent flows _______________ terms dominate. |
| A. | diffusion terms |
| B. | convection terms |
| C. | viscous stress terms |
| D. | turbulent effect terms |
| Answer» E. | |
| 5. |
The terms accounting for turbulence effects contain ____________ |
| A. | Reynolds stresses |
| B. | Turbulent kinetic energy |
| C. | Dissipation of turbulent kinetic energy |
| D. | Length scale terms |
| Answer» B. Turbulent kinetic energy | |
| 6. |
If Sij represents the rate of deformation, μ represents the dynamic viscosity and \(\vec{V}\), the velocity of the flow, What does the terms div(2μ\(\vec{V}\)Sij) and 2μSij account for? |
| A. | The effect of turbulent stresses |
| B. | The effect of viscous stresses |
| C. | The effect of Reynolds stresses |
| D. | The effect of kinetic energy |
| Answer» C. The effect of Reynolds stresses | |
| 7. |
____________ and _____________ are used in the k-ε model in addition to k and ε to formulate the transport equations. |
| A. | Internal thermal energy and turbulent stresses |
| B. | Internal thermal energy and kinetic energy |
| C. | Rate of deformation and turbulent stresses |
| D. | Rate of deformation and kinetic energy |
| Answer» D. Rate of deformation and kinetic energy | |
| 8. |
The k-ε model focuses on the mechanism which affects ____________ |
| A. | the Reynolds stresses |
| B. | the cross stresses |
| C. | the transport of scalar fluxes |
| D. | the turbulent kinetic energy |
| Answer» E. | |
| 9. |
What does k and ε stand for? |
| A. | Turbulent kinetic energy and its dissipation rate per unit mass |
| B. | Turbulent kinetic energy and turbulent diffusivity |
| C. | Turbulent diffusivity and its dissipation rate per unit mass |
| D. | Turbulent kinetic energy and mass transfer |
| Answer» B. Turbulent kinetic energy and turbulent diffusivity | |
| 10. |
What does the name k-ε model signify? |
| A. | The seven extra transport equations used in the model |
| B. | The variation of k and ε with the flow variables |
| C. | The variation of k with ε |
| D. | The two extra transport equations used in the model |
| Answer» E. | |