1.2. Behavior of Large and Small Eddies

Try these first

1. 1.

   What are large eddies in turbulent flow?

   Hint

   Consider their attributes linked to fluid dynamics.

2. 2.

   How do small eddies differ from large eddies?

   Hint

   Think about the Kolmogorov hypothesis.

3. 3.

   What type of behavior do large eddies exhibit?

   • Isotropic
   • Anisotropic
   • Universal

   Hint

   Think about how large structures behave differently in various orientations.

4. 4.

   True or False: Small eddies are isotropic and follow the Kolmogorov hypothesis.

   • True
   • False

   Hint

   Recall the differences noted earlier in the lesson.

5. 5.

   Calculate the energy cascade process between large and small eddies in a turbulent system. Consider energy input from the mean flow to large eddies and the transfer to small eddies.

   Hint

   Think about the representation of energy levels and how they interact.

6. 6.

   Develop a detailed simulation plan using LES for a turbulent flow scenario. What factors would you need to consider for filtering and grid size?

   Hint

   Recall the filtering functions we discussed and how they relate to grid scales.