Fundamentals of Fluid Mechanics Questions and Answers

Question by AME536A Student With all due respect Professor, you could apply that logic to all of the problems which were assigned. In theory, every single student should have completed the assignments. But at that point, in my interpretation, the final becomes a test of being able to memorize and regurgitate. Granted, I may just not understand a more fundamental objective that you have but that what it appears to me as just a student.

12.02.21

The final exam is a test of being able to solve the problems correctly. First, make sure you can solve the problems correctly. Once this is done, “memorizing” them should be a breeze. I have excluded some problems in previous years 536A-B final exams, but those were limited to derivations.

Question by AME536A Student Given that homework set #11 is due on the 7th, how will the feedback turn around look for the assignment?

If more than 80% of you file 536A reports, I'll explain how to solve the A11Q1 problem in class on Tuesday. So far, the response rate is 35%.

Question by AME536A Student Would it be reasonable to have Bernoulli's Equation for potential flow added to the tables? $\frac{\partial \phi}{\partial t} + \frac{1}{2}\vec{v}\cdot\vec{v} + \frac{P}{\rho} + F_{B} = g(t)$	12.05.21

Yes it's a good addition. I'll add it.

Question by AME536A Student Hi Dr. Parent, In one of the previous responses, you mentioned that in past semesters some derivations were excluded from the final. I'm just curious what the criteria was for a derivation to be excluded and if that criterion applies to any of the questions we have this semester? Thanks!	12.06.21

If it's a derivation done in class and that is lengthy and hard to remember then I can exclude it from the final.

Question by AME536A Student Dr. Parent, would it be possible to exclude or shorten Q3 from HW 6? Upon reworking this problem, I've found that finding the air temperature when the pressure reaches 5 bar as well as when the liquid has been drained completely - along with the side task of proving that enthalpy is conserved along a streamline - takes quite a bit of time. If it is not possible to exclude this question entirely, would it be possible to shorten it such that we would only need to find the air temperature at one of the provided conditions? Thank you for your consideration.

12.09.21

Yes this entire questions is lengthy. However, each part can be done within 30 minutes. So if I do ask you this question, I'll ask either part (a) or part (b) but not both. Proving that enthalpy is conserved on a streamline can be done shortly within 3-5 lines.

Question by AME536A Student For A3Q3, I use my first control volume around tank 2 and obtain the following equation by applying mass conservation: \begin{equation} \dot{m}_{\rm air,2}-\dot{m}_{\rm w,out}+\dot{m}_{\rm 12}=2.995\ {\rm kg/s} \end{equation} I use a second control volume enclosing the pipes between tank 1 and tank 2 where the air is flowing and obtain the following using mass conservation: \begin{equation} \dot{m}_{\rm air,1}+\dot{m}_{\rm air,2}=0.02\ {\rm kg/s} \end{equation} and the third control volume enclosing tank 1 yields, using mass conservation and considering that the rate at which the volume of air in the tank increases is equal to the rate at which the volume of water in the tank decreases: \begin{equation} (\rho_w -\rho_{\rm air})\frac{dV_{\rm 1,water}}{dt}-\dot{m}_{\rm air,1}+\dot{m}_{\rm 12}=0 \end{equation} Thus, I end up with 5 unknowns ($\dot{m}_{\rm air,1}$, $\dot{m}_{\rm air,2}$, $\dot{m}_{\rm w,out}$, $\dot{m}_{\rm 12}$ and $\frac{dV_{\rm 1,water}}{dt}$) but only 3 equations. Can you give a hint on how I could proceed to tackle this problem?

Answered in the office hours.

Question by AME536A Student Hi Dr. Parent, I am working on question 1 from homework 9 and am wondering if you can help me visualize the problem a little bit more. Are we to assume that the body in the flow is a half-sphere or is it a half-cylinder? Thank you for your time!	12.10.21

Half cylinder.

Question by AME536A Student What is the length that we should use for the half cylinder? Should we relate it to the radius or theta or both?

This is a 2D problem, not a 3D problem.	12.11.21

Question by AME536A Student Hi Dr. Parent, I have a question about homework 10 question 2. For this question, we are meant to find the force on the ship. For my solution on the homework, I tried to derive the equation for the velocity of airspeed, and then perform the integral: $$\vec{F} = \int\limits_S P{n} dS$$ In your corrections, however, you mentioned that I should start with $$F_L = \rho{q}{H}\Gamma$$ I am a little bit confused about what is meant by this. I believe I still need to find the force acting on the cylinder due to the fluid motion, and then I can take a summation of forces to find the total force value, is this correct?

12.13.21

The exam is tomorrow and the final exam has been written. No more questions this semester.

Question by AME536A Student Have you assigned the first assignment yet? Will it be posted online?	08.25.22

Not yet. Each assignment's due date will be announced on the D2L. The announcement will be made at least 7 days in advance of the due date.

Question by AME536A Student Do we need to turn in the homework in class or is there also a d2l submission option?	09.05.22

The homeworks must be handed in in class.

Question by AME536A Student Where can we find the recorded lectures?	09.12.22

Go on D2L -> UA Tools -> Zoom -> Cloud Recordings.

Question by AME536A Student Most (if not all) students in your fluids class also have a math exam this upcoming Tuesday (September 27th). Would it be possible to extend the due date for the homework to provide more space to study for AME 500A and give our best on your assignment? I apologize for the last minute request, and I completely understand if it's not possible.	09.25.22

I think you should be able to manage your time to handle this situation without being given an extension. However, I'll make an exception in this case and I will give you 2 extra days to complete your assignment #4. Note that I will not give an extension to an assignment again this semester.

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