Practice Governing Equations (2.5) - Computational fluid dynamics (Contd.)

Practice: Governing Equations

Lesson 2.5Computational fluid dynamics (Contd.)

Practise this section

10 questions

Flashcard drill
5 cards from this section. Quick, good the night before a test.
Exercise
6 questions · about 4 min · pass mark 70%. Hints available.
Sign up to start the exercise
Quiz
4 questions · about 3 min · pass mark 70%. Hints available.
Sign up to start the quiz

6 sample questions

Question 1.
What does Reynolds shear stress represent?
Show hintHide hint
Think about the fluctuating part of fluid velocity.
Question 2.
State what the closure problem involves.
Show hintHide hint
Look for where we relate unknowns back to known quantities.
3Question 3.
What is the primary purpose of the closure problem in turbulence modeling?
- To simplify equations
- To relate unknowns to known values
- To define flow direction
Show hintHide hint
Focus on how turbulent flow terms are connected.
4Question 4.
True or False: The k-epsilon model only considers the velocity field in turbulent flows.
- True
- False
Show hintHide hint
Reflect on what parameters the k-epsilon model uses.
Question 5.
Given a turbulent flow with a Reynolds number of 10^5, estimate the number of grid points needed for DNS and discuss the computational challenges involved.
Show hintHide hint
Use the power relationship to scale the number of required grid points.
Question 6.
Explain how the k-epsilon model can be applied to a real-world scenario like airflow in a tunnel. Discuss the benefits and limitations.
Show hintHide hint
Consider aspects like flow conditions and scales when relating it to the k-epsilon model.

6 more questions in this section. Enroll free to practise them all.