1. Large Eddy Simulation

Try these first

1. 1.

   What does LES stand for?

   Hint

   Remember the main terms associated with turbulence.

2. 2.

   What is the primary advantage of using LES over DNS?

   Hint

   Consider the resource demands of each technique.

3. 3.

   What is the purpose of Large Eddy Simulation?

   • To resolve all turbulent scales without approximation.
   • To model the behavior of large eddies while approximating smaller ones.
   • To simplify the Navier-Stokes equations for non-turbulent flows.

   Hint

   Think about the relationship between accuracy and efficient computation.

4. 4.

   True or False: In LES, small eddies are fully resolved without approximation.

   • True
   • False

   Hint

   Consider what LES focuses on versus what is approximated.

5. 5.

   Considering a theoretical turbulent flow field, describe how you would set up a grid for LES, detailing considerations for both large and small eddies.

   Hint

   Think about size ratios and the relationship with physical flow characteristics.

6. 6.

   Discuss the implications of Kolmogorov's hypothesis on LES and its challenges in developing a universal turbulence model.

   Hint

   Reflect on the relationship between universal behaviors and modeling accuracy.