1.5. Computational Fluid Dynamics (Contd.,)

Try these first

1. 1.

   What is Reynolds shear stress?

   Hint

   Think about how turbulence influences flow dynamics.

2. 2.

   What does the k represent in the k-epsilon model?

   Hint

   Consider what factors contribute to energy in fluids.

3. 3.

   What does the closure problem in CFD involve?

   • Modeling unknown terms in equations
   • Solving algebraic equations
   • Determining flow rates

   Hint

   Think about why simplifications are necessary.

4. 4.

   True or False: The k-epsilon model only accounts for mean kinetic energy.

   • True
   • False

   Hint

   Consider what k represents.

5. 5.

   Evaluate the feasibility of using DNS for simulating weather patterns characterized by high turbulence and what computational challenges you might face.

   Hint

   Think about the resources available and scale of simulation needed.

6. 6.

   Compare and contrast the k-epsilon model and turbulent flow characteristics in engineering applications, providing examples where one might be preferred over the other.

   Hint

   Consider different aerospace and civil engineering scenarios to highlight this.