2.3. Modeling of Reynolds Shear Stress

Try these first

1. 1.

   What is Reynolds shear stress?

   Hint

   Think about the relationship between stress and flow fluctuations.

2. 2.

   Define closure problem in the context of turbulence.

   Hint

   Remember, it relates to simplifications in modeling.

3. 3.

   What does Reynolds shear stress measure?

   • A measure of density
   • A measure of stress due to fluctuations
   • A constant value

   Hint

   Consider what stress relates to uneven flow.

4. 4.

   True or False: Eddy viscosity is essential in turbulence modeling.

   • True
   • False

   Hint

   Think about how turbulence modifies standard viscosity.

5. 5.

   If you were to design a computational fluid dynamics study on a high Reynolds number flow, what considerations would you have to take into account regarding grid size and domain scale?

   Hint

   Remember how energy transfers between scales in turbulence.

6. 6.

   Calculate the required grid points for a numerical simulation involving a fluid with Reynolds number 10^4. Discuss the implications of these requirements in logistics.

   Hint

   Think about how grid size scales with Reynolds number in simulations.