FBU - Basics of Fluid Mechanics

MigrationCheck-Basics of Fluid Mechanics

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In this simulation, the moving wall condition applied to the face zones {ground-fluid_external} and {ground-fluid_internal} implies that:

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Which of the following equations is NOT solved for the flow field around the 2D sports car in this simulation?

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What is the velocity of the air on the surface of the car?

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Based on the learnings of this simulation, what is the impact of increasing the velocity of this sport car to $60\ m/s$?

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The pressure drag force on the car is larger than the viscous drag by

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The following image shows a vector plot of the velocity around the car. The region shown here highlights:

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The static pressure around the car is shown in this contour plot. The red color indicates region with high static pressure. The reason behind this high pressure is:

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In this simulation, where is the maximum velocity around the car? Use provided illustration to answer this question.

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The region around the car where the static pressure is the lowest is at _________. Use provided illustration to answer this question.

 

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What is the drag coefficient on the car in this simulation when it is travelling at $40\ m/s$?

(Choose the range the value falls within.)

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What is the total drag force on the car when it is travelling at $40\ m/s$?

(Choose the range the value falls within.)

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The following assumptions are true in this simulation.

(Select the two correct answers.)

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The flow Mach number at the inlet is (assume the speed of sound is $343\ m/s$).

(Choose the range the value falls within.)

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When the inlet velocity is $40\ m/s$, what is the flow Re number (based on the car length)? (Choose the range the value falls within.)

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Which of the following equations is NOT solved for the flow field around the sphere in this simulation?

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What is the velocity of the fluid on the surface of the sphere?

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What would you expect to happen to the total drag force experienced by the sphere if the viscosity of the fluid were halved?

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The ratio of pressure and viscous drag forces obtained in this simulation is:
(Choose the range the value falls within.)

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If the velocity of the fluid at the inlet were doubled, what would be the impact of this change on the overall total drag force experienced by the sphere?

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What assumptions and simplifications are true for this simulation?
(Select the two correct answers.)

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This is a contour plot of wall shear stress. The regions with the lowest wall shear stress are indicated in blue. The reason behind these low shear stress values is:

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The area represented by the following velocity vector plot is:

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The static pressure distribution on the sphere is shown in the following contour. The highest pressure is marked in red color. The pressure on the sphere surface is high because of ______.
(Select the two correct answers.)

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Where on the sphere is the lowest wall shear stress located? Use this image as reference to answer this question. The fluid flow is from left to right.
(Select the two correct answers.)

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Where on the sphere is the highest wall shear stress located? Use this image as reference to answer this question. The fluid flow is from left to right.
(Select the two correct answers.)

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Which of the following statements is true? Use the illustration provided to answer this question.

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In the illustration here, in which region is the wake located? The fluid flow is from left to right.

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Where on the sphere would the static pressure be the highest? Use this image as a reference to answer this question. The fluid flow is from left to right.

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What is the total drag coefficient on the sphere?
(Choose the range the value falls within.)

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In this simulation, what is the direction of the total drag force?

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For a Reynolds number (based on sphere diameter) of $15$, what is the correct range of the magnitude of the total drag force on the sphere?

(Use the provided properties of Castor oil. Choose the range the value falls within.)

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For a Reynolds number (based on the sphere diameter) of $15$, what is the correct range of inlet velocity?
(Use the provided properties of Castor oil. Choose the range the value falls within.)

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What would be the value of $C_{l}$ for the airfoil used in the example if the angle of attack was $0$ degrees?

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

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

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

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The velocity on the airfoil surface:

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In this simulation example, what frame of reference are we using?

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Which of the following pictures shows the distribution of the pressure coefficient on the airfoil for this simulation example?

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In which of the regions reported on the sketch is the wake located?

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In which of the regions reported on the sketch is the velocity the highest?

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In which of the regions reported on the sketch is the pressure the lowest?

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In which of the regions reported on the sketch is the pressure 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.

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Take a look at the picture shown here. The contours show the distribution of _______ around the airfoil.

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What is the value of the lift coefficient ($C_{l}$) for this example?
(Choose the range the value falls within.)

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What is the value of the drag coefficient ($C_{d}$) for this example?
(Choose the range the value falls within.)

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In this simulation example we are making the following assumptions:
(Select the two correct answers.)

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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?
(Choose the range the value falls within.)

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Consider regions $A$ and $B$ in the image shown here, based on the setup of the simulations, which of the following statements is true
(Select the two correct answers.)