Laminar Boundary Layer Theory

Intro to Laminar Boundary Layer Theory - Lesson 1

Integral Analysis of Boundary Layers - Lesson 2

Theory of Laminar Boundary Layers - Lesson 3

Flat-Plate Blasius Solution - Lesson 4

Other Boundary Layer Solutions and 3D Layers - Lesson 5

Simulation Examples, Homework, and Quizzes

5 Topics | 1 Quiz

Laminar Flow Over a Flat Plate - Simulation Example

Laminar Flow Over a Spinning Disk - Simulation Example

Laminar Flow Inside an S-Bend - Simulation Example

Laminar Flow Due to a Moving Flat Plate - Homework

Laminar Flow Over a Wedge - Homework

Quiz - Laminar Boundary Layer Theory

Post Completion Survey

Meet the Instructors

Login to Enroll

Quiz - Laminar Boundary Layer Theory

Laminar Boundary Layer Theory Simulation Examples, Homework, and Quizzes Quiz - Laminar Boundary Layer Theory

Time limit: 0

Quiz Summary

0 of 14 Questions completed

Questions:

Information

You have already completed the quiz before. Hence you can not start it again.

Quiz is loading...

You must sign in or sign up to start the quiz.

You must first complete the following:

Results

Quiz complete. Results are being recorded.

Results

0 of 14 Questions answered correctly

Your time:

Time has elapsed

You have reached 0 of 0 point(s), (0)

Earned Point(s): 0 of 0, (0)
0 Essay(s) Pending (Possible Point(s): 0)

Categories

Not categorized 0%

Unfortunately, you did not pass the quiz.

Don't be discouraged - Go through the course material including the lecture videos, handout slides, and simulation examples to prepare and try again.
Congratulations, you have passed the quiz!

You still have room for improvement - Review the slides and simulation examples again to identify the concepts that you may have missed.
Congratulations, you have passed the quiz!

You scored better than average, but if you are still unsure about a particular topic, try starting a discussion on the Ansys Learning Forum to discuss your questions with peers around the world.
Congratulations, you have passed the quiz!

You did great - Check out other courses to further your knowledge. Also, visit the Ansys Learning Forum and participate in discussions on this subject to help your peers and deepen your own knowledge.
Congratulations you have passed the quiz!

You have excelled on this topic - Check out other courses and see if you can ace them too. Also, visit the Ansys Learning Forum to help your peers on this topic. With your knowledge, you can make a real difference.

1
2
3
4
5
6
7
8
9
10
11
12
13
14

Current
Review
Answered
Correct
Incorrect

Question 1 of 14

1. Question
A boundary layer is a thin region close to a surface where…
- (1) viscous effects are negligible
- (2) viscous effects are important
- (3) flow is inviscid
- (4) flow reverses direction
Correct

Incorrect
Question 2 of 14

2. Question
The boundary layer thickness $\delta(x)$ is defined as the distance from the wall where the fluid velocity reaches what percentage of the freestream velocity?
- (1) 10%
- (2) 50%
- (3) 75%
- (4) 99%
Correct

Incorrect
Question 3 of 14

3. Question
A boundary layer will cease to exist when the flow…
- (1) becomes turbulent
- (2) separates from the wall
- (3) accelerates near the wall
- (4) decelerates near the wall
Correct

Incorrect
Question 4 of 14

4. Question
The distance that streamlines outside of the boundary layer are effectively moved by the presence of the boundary layer is called…
- (1) the momentum thickness
- (2) the boundary layer shear
- (3) the displacement thickness
- (4) the entrance effect
Correct

Incorrect
Question 5 of 14

5. Question
In order to calculate the drag force on a plate, you need to know…
- (1) the pressure difference between the entrance and exit of the plate
- (2) the normal pressure distribution along the plate
- (3) the density of the fluid
- (4) the shear stress distribution along the plate
Correct

Incorrect
Question 6 of 14

6. Question
From scale considerations of the boundary layer, which of the following is true?
- (1) The axial velocity is much smaller than the normal velocity.
- (2) The axial velocity gradient $\frac{\partial u}{\partial x}$ is much smaller than the normal velocity gradient $\frac{\partial v}{\partial y}$.
- (3) The axial velocity gradient $\frac{\partial u}{\partial x}$ is about the same order of magnitude as the normal velocity gradient $\frac{\partial v}{\partial y}$
- (4) The normal velocity gradient $\frac{\partial v}{\partial y}$ tends to a constant value at the wall.
Correct

Incorrect
Question 7 of 14

7. Question
At the outer edge of the flat plate boundary layer…
- (1) the axial velocity must go to zero
- (2) the normal direction pressure gradient becomes non-zero
- (3) the velocity approaches the freestream velocity
- (4) the axial velocity gradient tends to zero
Correct

Incorrect
Question 8 of 14

8. Question
At walls, the “No Slip” condition for viscous flows requires that…
- (1) only the normal component of the fluid velocity is zero
- (2) the tangential component of velocity is non-zero
- (3) the velocity gradient is zero
- (4) the velocity magnitude is zero
Correct

Incorrect
Question 9 of 14

9. Question
Who was the first person to obtain a general analytical solution to the flat boundary layer equations?
- (1) Faulkner
- (2) Blasius
- (3) Von Karman
- (4) Prandtl
Correct

Incorrect
Question 10 of 14

10. Question
The Blasius solution to the boundary layer equations transforms the original set of partial differential equations into
- (1) a single ordinary differential equation
- (2) a single integral equation
- (3) an exact algebraic equation for the velocity
- (4) a single partial differential equation
Correct

Incorrect
Question 11 of 14

11. Question
From the Blasius solution, we see that the boundary layer thickness varies as…
- (1) $Re_{x}^{1/2}$
- (2) $Re_{x}^{-1/2}$
- (3) $Re_{x}^{-1/3}$
- (4) $Re_{x}^{2}$
Correct

Incorrect
Question 12 of 14

12. Question
What is the significance in developing correlations for boundary layer quantities such as skin friction coefficient and drag?
- (1) We can use them to can estimate boundary layer flows for all shapes.
- (2) We can use them to estimate the drag due to pressure differences.
- (3) We can use them to estimate friction drag for flat plates of any length or freestream flow.
- (4) We can use them to estimate friction drag for a single freestream flow condition but any plate length.
Correct

Incorrect
Question 13 of 14

13. Question
The Faulkner-Skan equation generalizes of the laminar Blasius boundary layer solution for…
- (1) circular cylinders
- (2) square geometries
- (3) wedge shaped geometries
- (4) oval-shaped cylinders
Correct

Incorrect
Question 14 of 14

14. Question
Using three-dimensional boundary layer equations, what significant flow feature can be captured than cannot be captured with the two-dimensional equations?
- (1) boundary layer separation in the streamwise direction
- (2) small velocities with components perpendicular to the flow
- (3) normal pressure gradients at the wall
- (4) stagnation point flow
Correct

Incorrect