2.4. Subgrid Scale Modeling

Try these first

1. 1.

   What does LES stand for?

   Hint

   Think of the full words of each letter.

2. 2.

   What is the main advantage of Large Eddy Simulation over DNS?

   Hint

   Consider the resource versus accuracy trade-off.

3. 3.

   What does LAS stand for?

   • Large Analyzed Simulation
   • Large Eddy Simulation
   • Lower Eddy Simulation

   Hint

   Think about the focus on large elements in turbulence.

4. 4.

   True or False: Small eddies in turbulence are isotropic.

   • True
   • False

   Hint

   Consider the symmetry of small-scale turbulence.

5. 5.

   Derive the implications of assuming isotropy in small eddies when applying the Kolmogorov hypothesis in modeling.

   Hint

   Investigate how isotropy impacts overall turbulence dynamics.

6. 6.

   If you were to design a new turbulence model using LES, what key factors would you consider for both large and small eddy behavior?

   Hint

   Reflect on how the characteristics of turbulence differ across scales.