Practice Comparison With Dns (1.1) - Large Eddy Simulation - Hydraulic Engineering

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 is the primary advantage of Direct Numerical Simulation?
Show hintHide hint
Think about the reason why more computations might be necessary.
Question 2.
What do large eddies extract energy from?
Show hintHide hint
Consider which aspect of the flow provides energy.
3Question 3.
What is the main focus of Direct Numerical Simulation (DNS)?
- Capturing small eddies
- High accuracy and resolution
- Energy extraction from mean flow
Show hintHide hint
Think about what DNS stands for.
4Question 4.
True or False: Large Eddies are isotropic.
- True
- False
Show hintHide hint
Recall the definition of anisotropic behavior.
Question 5.
Explain how the choice of grid size in LES could impact the accuracy of simulations. What considerations must be taken into account?
Show hintHide hint
Think about what happens if the grid is too large or too small.
Question 6.
Discuss the role of turbulence models in LES. Why can't smaller eddies be resolved directly, and what complications could arise?
Show hintHide hint
Consider the trade-offs between computational demands and accuracy in modeling scales.

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