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Aerodynamics Practice Test: Boundary Layers, Laminar & Turbulent Boundary Layers, Navier Stokes Solutions
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Boundary layer equations are a simplified form of the Navier-Stokes equations. The solution to the boundary layer equations for steady flow over a flat surface parallel with the oncoming flow is called the Blasius solution.  Boundary layers can be classified into different types: Laminar boundary layer: Flow inside this layer is smooth and takes place in layers. Laminar boundary layers are formed when the Reynolds number is low. Turbulent boundary layer: Flow inside this layer is more chaotic and is characterized by active mixing of the fluid and momentum across several layers. Turbulent... Show more
Aerodynamics Practice Test: Boundary Layers, Laminar & Turbulent Boundary Layers, Navier Stokes Solutions
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22 Questions

1. When there’s flow over a flat plate, there’s laminar boundary layer at the leading edge followed by turbulent boundary layer.
2. According to the y – momentum equation, how does the pressure vary inside the boundary layer normal in the direction normal to the surface?
3. What is the thermal boundary layer?
4. Which of these relations is applicable for turbulent and laminar boundary layer?
5. What are the shortcomings of DNS?
6. Why are turbulence models used?
7. How is the boundary layer thickness defined? (ue is the outer edge velocity)
8. Which of these models solves turbulent kinetic energy and specific dissipation?
9. One equation turbulence model account for the history effects such as turbulent energy, diffusion and convection.
10. Which of these is not a property of boundary layer?
11. Which of these models is a hybrid of LES and RANS?
12. When the Reynolds number approaches infinity, what happens to the boundary layer thickness?
13. What is the skin friction drag for an incompressible turbulent flow with Reynolds number = 1.5 × 107 over a flat plate?
14. Turbulent boundary layer is considered to be a combination of inner and outer layer.
15. What is the value of kinetic energy thickness?
16. The displacement thickness is the distance by which, due to the presence of the boundary layer, the flow streamline is displaced.
17. How does the turbulent boundary layer vary with respect to the Reynolds number?
18. Which of these models compute large vortexes directly while neglecting small scale eddies?
19. In which case are the velocity and thermal boundary layer equal?
20. What leads to shear stress between the adjacent layers of fluid inside the boundary layer adjacent to the surface?
21. What is the equation for momentum thickness?
22. Which of these is a two – equation model?