FBU - Real Viscous Flows

MigrationCheck-Real Viscous Flows

1 / 210

Four possible options for the flow direction are represented in the sketch. Which one best represents the free-stream flow direction for this simulation?

2 / 210

How would the value of $C_L$ change if the angle of attack was $0$ degrees?

3 / 210

Which of the following is a boundary condition used in this simulation?

4 / 210

Which of the following is a boundary condition used in this simulation?

5 / 210

Which of the following is a boundary condition used in this simulation?

6 / 210

The velocity on the surface of the flap:

7 / 210

Which of three elements is the main contributor to drag?

8 / 210

Which of three elements is the main contributor to lift?

9 / 210

Which of the following pictures show the distribution of turbulent kinetic energy around the airfoil for this simulation example?

10 / 210

The viscous drag acting on the full model is about _______ of the total drag.
(Please select the appropriate range.)

11 / 210

In which of the four regions around the airfoil is the stagnation point located?

12 / 210

In which of the four regions around the airfoil is the velocity the highest?

13 / 210

In which of the four regions around the slat is the flow recirculating?

14 / 210

In which of the four regions around the slat is the velocity the highest?

15 / 210

Take a look at the picture of the velocity vectors shown here. The area represented is:

16 / 210

Take a look at the picture shown here. The contours show the distribution of _______ around the airfoil.
(Based on default colormap.)

17 / 210

Take a look at the picture shown here. The contours show the distribution of _______ around the airfoil.
(Based on default colormap.)

18 / 210

What is the value of the lift coefficient ($C_L$) for this example?
(Please select the appropriate range.)

19 / 210

What is the value of the drag coefficient ($C_D$) for this example?
(Please select the appropriate range.)

20 / 210

What is the characteristic dimension for calculating the Reynolds number for this example?

21 / 210

What is the Reynolds number for the current simulation?
(Please select the appropriate range.)

22 / 210

When performing an analysis in the stationary ambient frame of a maneuvering vehicle, the velocity of the solid body ($\vec{V}_{solid}$) is:

23 / 210

When analyzing an object moving in a stationary reference frame, the no-slip condition on the object surface is defined as:

24 / 210

In what situations is using a moving reference frame ($MRF$) to analyze a turbomachinery application advantageous compared to an absolute reference frame?
(Select the two correct answers.)

25 / 210

If we compare the momentum equation for the relative and absolute velocity formulations, we can say that:

26 / 210

Which of the following is the correct expression for the moving frame velocity ($\vec{U}$)?

$\vec{\omega}$ is the angular velocity
$\vec{V}_t$ is the translational velocity
$\vec{r}$ is the position vector

27 / 210

Which of the following options is correct for describing the absolute velocity ($\vec{V}$)? (Select the two correct answers.)

$\vec{W}$ is the relative velocity
$\vec{U}$ is the frame velocity

28 / 210

Which of the following options is correct for describing the relative velocity ($\vec{W}$)?
(Select the two correct answers.)

$\vec{V}$ is the absolute velocity
$\vec{U}$ is the frame velocity

29 / 210

Which of the following statements are true for the Absolute Velocity Formulation ($AVF$)?
(Select the two correct answers.)

30 / 210

Which of the following statements are true for the Relative Velocity Formulation ($RVF$)?
(Select the two correct answers.)

31 / 210

Which of the following are examples of rotating devices?
(Select the two correct answers.)

32 / 210

Which of the following are examples of turbomachinery?
(Select the two correct answers.)

33 / 210

If the flow through a turbomachine is perpendiculat to the axis of rotation, then we can say that the apparatus is:

34 / 210

If the flow through a turbomachine is aligned with the axis of rotation, then we can say that the apparatus is:

35 / 210

According to the Stefan-Boltzman law, the relationship between the emissive power ($E_b$) of an ideal blackbody and the absolute surface temperature ($T_s$) is:

36 / 210

Which of the following statements related to radiation is FALSE?

37 / 210

In the thermal boundary layer, the convection heat transfer between the hot solid surface and the bulk fluid is because of:

38 / 210

The surface temperature of a flat plate is $T_s$. The freestream temperature of the low speed moving fluid is $T_{\infty}$. Which of the following statements are true regarding convection heat transfer between the flat plate and the fluid?
(Select the two correct answers.)

39 / 210

The temperature at the two ends A and B of an insulated iron rod is maintained at $T_A$ and $T_B$ such that $T_A > T_B$. Assuming that the diameter of the rod is small, which of the following statements are TRUE?
(Select the two correct answers.)

40 / 210

Heat is always transferred:

41 / 210

In ________, heat is transferred from more energetic to less energetic particles because of molecular interactions.

42 / 210

The only mode of heat transfer occuring in vaccuum is:

43 / 210

Conduction heat transfer can occur in:
(Select the three correct answers.)

44 / 210

The following statements are true regarding the field of thermodynamics.
(Select the two correct answers.)

45 / 210

Which of the following equations is referred to as the ideal gas equation of state

46 / 210

For a supersonic flow over 2d wedge as shown in the figure, the shock waves formed can be categorized as

47 / 210

Across a shock wave, which of the of the following flow properties increase?
(Select the three correct answers.)

48 / 210

Across a shock wave, which of the following flow properties decrease?
(Select the two correct answers.)

49 / 210

Which of the following is an example of hypersonic flow. Assume the speed of sound is $340 \ m/s$.

50 / 210

For a compressible liquid with density $\rho$ and bulk modulus $K$, which of the following equations can be used to calculate the speed of sound?

51 / 210

For an ideal gas, the speed of sound is only a function of _____

52 / 210

Consider a truly incompressible medium. The speed of sound in such a medium is _______