[negative9]

I'm taking my first CFD class (Grad) and I've been assigned HW of course. I'm very new at this. I've been assigned to fulfill my HW in MATLAB. My instructor has/ isn't very helpful with this matter. My first question: with the equations in the book(my HW), they list no variables to plug in. Am I just programming the equation and running it to verify it's function, or do I give my own variables to fulfill an answer?

My text book is Computational Fluid Dynamics and Heat transfer, third edition.

Any tips In Matlab to start me off, would be greatly helpful. I have until today to achieve some direction, or I'll be forced to drop. I've been at it for two days with no success of achieving some answers.

Thanks -9

[sbaffini]

I suggest to drop... it's CFD

[CFD-Lover]

Dear Abruce,

Usually, even if you were a good programmer, the problem itself could be hard. Therefore, I would suggest to read about Matlab. There are many sources that could guide step by step. You could use Youtube for instance to learn for loops as well as while loops storing ...etc. You can also search on the internet on similar problems. Trust, google will make the tick! Group study with people know programming is also helpful!

There are many sources that could boost your weakness and patience is a virtue!

Best,

[HectorRedal]

Just a few suggestions

You have several problems:
- Understanding the physics.
- Learning how to program (you can look for it in the internet and any other book that explain how to program)
- Learning how to program in Matlab (as some others have suggested there are tons of sources in the internet you can look at, for example, tutorials in youtube, etc.).
- try to map the particular set of Navier-Stokes equation in Matlab.

This is a big gap that it is not easy to fill. Do not expect a silver bullet on this.

I am not going to discourage, but prepare for it and be patient.

[negative9]

I was forced to drop the class due to not being quite ready for it. I did however manage to gain a clear direction in the three trying days to be successful. I'm now focusing on my skills as a programmer in matlab. I conversed with my instructor and it was advised to gain a better knowledge of the tool before attempting the class again. The Navier-Stokes equation can be achieved in matlab? I thought this was an unsolvable equation? I know it's modeled for the viscous flow application. I will research this subject further....


Thanks for the advice.

[sbaffini]

I just want to add that my comment was not meant to be mean. But, especially at the point where you are, such roughness is better than politeness. As then you either drop for real and never come back, saving time for something you're really into or, by the shock, somehow, you totally change attitude and get into the path.

I've been there, and in some cases there is no other way around.

It's up to you.

[negative9]

How long did it take to get a good grasp on the subject matter in order to be proficient in your studies? What were some of your earlier assignments to tackle that made things clear?


Thanks -9

[arjun]

Originally Posted by negative9

How long did it take to get a good grasp on the subject matter in order to be proficient in your studies? What were some of your earlier assignments to tackle that made things clear?
Thanks -9

I am too slow so it was almost a year when it started to make some sense. Add another year and i got a little bit of feel of it.

[sbaffini]

Originally Posted by negative9

How long did it take to get a good grasp on the subject matter in order to be proficient in your studies? What were some of your earlier assignments to tackle that made things clear?


Thanks -9

I don't know if I can give you the answer you want.

For me, it always sounds strange when some student comes here, without even knowing what to do with the equations or what they mean, and asks help in solving them with some numerical method they have never heard of. In the process that bringed the student to this point there is clearly something wrong.

How it worked for me:

- fluid dynamics and programming course at the first bachelor year
- aerodynamics course (including panel method programming) at the second bachelor year
- compressible aerodynamics, basic numerical methods and 2 turbulence courses at the third bachelor year
- bachelor thesis using a commercial CFD solver and programming its UDF
- advanced courses on aerodynamics (with programming) and numerical solution of PDE at the first master year
- 2 courses on CFD (with programming) and 1 on advanced compressible aerodynamics at the second master year
- master thesis on LES using a commercial CFD solver
- phd courses/tasks with more programming and theory related to CFD
- phd thesis on LES

and this list does not include programming and/or numerical methods as were necessary in, say, courses or tasks not related to fluid dynamics.

As you can notice, I was not suddenly dropped in a CFD course at the first year and required to numerically solve the NS equation with a program written by myself. It was a path. Not all the paths are equal or required to delve as much into numerical methods or fluid dynamics. Still, the cronological order of the events is something you can't really change.

There are some career paths which don't actually expect you to numerically solve anything but just to use commercial codes. But even in those cases, the relative courses still provide a minimum amount of theory related to the methods and, most important, they do not actually ask you to solve anything if that was not part of the program. You simply can't if nobody teached you.

[arjun]

Originally Posted by sbaffini

As you can notice, I was not suddenly dropped in a CFD course at the first year and required to numerically solve the NS equation with a program written by myself. .

This is too much to ask i think from students specially when they don;t have much background.

[FMDenaro]

Actually, not only in the forum we see students asking for some work to do in numerical simulation they do not understand but that is what is happening in the university...just use a CFD software like a TV on demand.
And let me stop here my comments...

[sbaffini]

Originally Posted by arjun

This is too much to ask i think from students specially when they don;t have much background.

Yes, that's exactly my point. But then, either this is one of those cases or the student is faulty.