1.2. Department of Civil Engineering

Try these first

1. 1.

   What does the Reynolds shear stress measure in a fluid flow?

   Hint

   Think about how turbulence affects mean velocities.

2. 2.

   What do 'k' and 'epsilon' stand for in the k-epsilon turbulence model?

   Hint

   Consider the components of turbulence.

3. 3.

   What is the primary purpose of the k-epsilon model?

   • To predict laminar flow
   • To calculate turbulence effects
   • To simulate incompressible flow

   Hint

   Think about what aspect of fluid dynamics the k-epsilon model addresses.

4. 4.

   True or False: Direct Numerical Simulation does not use any turbulence models.

   • True
   • False

   Hint

   Consider the definition of Direct Numerical Simulation.

5. 5.

   A turbulent pipe flow exhibits a Reynolds number of 10,000. Given this, calculate the necessary resolution for a Direct Numerical Simulation to model accurately.

   Hint

   Relate the Reynolds number to grid size and computational requirements.

6. 6.

   Design an experimental procedure using the k-epsilon model for testing airflow in a wind tunnel. What parameters would you measure?

   Hint

   Think about the flow characteristics that would be influenced by the turbulence model.