# FBU - Real Viscous Flows

MigrationCheck-Real Viscous Flows

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

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

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

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

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

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The velocity on the surface of the flap:

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Which of three elements is the main contributor to drag?

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Which of three elements is the main contributor to lift?

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

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The viscous drag acting on the full model is about _______ of the total drag.

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

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

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

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

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

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

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

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What is the value of the lift coefficient ($C_L$) for this example?

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What is the value of the drag coefficient ($C_D$) for this example?

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

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What is the Reynolds number for the current simulation?

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

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

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In what situations is using a moving reference frame ($MRF$) to analyze a turbomachinery application advantageous compared to an absolute reference frame?

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

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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

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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

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

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

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Which of the following statements are true for the Absolute Velocity Formulation ($AVF$)?

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Which of the following statements are true for the Relative Velocity Formulation ($RVF$)?

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Which of the following are examples of rotating devices?

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Which of the following are examples of turbomachinery?

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

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

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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:

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Which of the following statements related to radiation is FALSE?

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

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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?

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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?

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Heat is always transferred:

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

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The only mode of heat transfer occuring in vaccuum is:

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Conduction heat transfer can occur in:

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The following statements are true regarding the field of thermodynamics.

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

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

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Across a shock wave, which of the of the following flow properties increase?

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Across a shock wave, which of the following flow properties decrease?

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

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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?

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

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