Practice Production Of Turbulent Kinetic Energy (2.7) - Computational fluid dynamics (Contd.)

Practice: Production of Turbulent Kinetic Energy

Lesson 2.7Computational fluid dynamics (Contd.)

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10 questions

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6 sample questions

Question 1.
What is turbulent kinetic energy?
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Think about both average and fluctuating components in a turbulent environment.
Question 2.
Define Reynolds shear stress.
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Consider how shear affects average flow in a turbulent medium.
3Question 3.
What does turbulent kinetic energy (TKE) measure?
- Mean energy only
- Fluctuating energy only
- Both mean and fluctuating energy
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Recall that TKE includes both average and fluctuating aspects.
4Question 4.
True or False: The closure problem is trivial in turbulence modeling.
- True
- False
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Think about what aspects of turbulence require more detailed modeling.
Question 5.
Calculate the amount of turbulent kinetic energy when given a flow velocity of 30 m/s and significant fluctuations at 2 m/s.
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Remember the TKE formula involves both the mean flow velocities and the fluctuations.
Question 6.
Explain why DNS might not be feasible for all engineering applications despite its accuracy. What might you propose as a solution?
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Think about the available technology and the complexity of calculating turbulent flows.

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