Practice Department Of Civil Engineering (1.2) - Computational fluid dynamics (Contd.)

Practice: Department of Civil Engineering

Lesson 1.2Computational fluid dynamics (Contd.)

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9 questions

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6 sample questions

Question 1.
What does the Reynolds shear stress measure in a fluid flow?
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Think about how turbulence affects mean velocities.
Question 2.
What do 'k' and 'epsilon' stand for in the k-epsilon turbulence model?
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Consider the components of turbulence.
3Question 3.
What is the primary purpose of the k-epsilon model?
- To predict laminar flow
- To calculate turbulence effects
- To simulate incompressible flow
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Think about what aspect of fluid dynamics the k-epsilon model addresses.
4Question 4.
True or False: Direct Numerical Simulation does not use any turbulence models.
- True
- False
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Consider the definition of Direct Numerical Simulation.
Question 5.
A turbulent pipe flow exhibits a Reynolds number of 10,000. Given this, calculate the necessary resolution for a Direct Numerical Simulation to model accurately.
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Relate the Reynolds number to grid size and computational requirements.
Question 6.
Design an experimental procedure using the k-epsilon model for testing airflow in a wind tunnel. What parameters would you measure?
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Think about the flow characteristics that would be influenced by the turbulence model.

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