[priya_c45]

hello everybody,
i am priya and i am doing my final year in aeronautical engineering.i need some help with figuring out a few topics for my major project in cfd.I can manage fluent and gambit but still as new as a beginner. The project is for a month and i am ready to work hard for an interesting topic...i am running out of ideas...the topic should be related to aircrafts or something in relation

[jyothishkumar]

what is the topic you have chosen ?

[jyothishkumar]

if you have not chosen i can tell you some good topic in cfd

[priya_c45]

well, nothing sepcific as such...i found this topic about VISCOUS CFD ANALYSIS OF GENERIC MISSILE WITH GRID FINS...
but i dont know how to go about it....i looks interesting but i ahve never used gridgen before

[jyothishkumar]

If you are new to cfd i suggest you to write a simple cfd code rather than using a package. then only you will understand the cfd basics. Do you have any experience in writing cfd code ? if You are interested i can suggest you in the area of coding.

[priya_c45]

i have studies cfd in my earlier semester and we also had a cfd simulations lab...

[priya_c45]

i have opted for advanced cfd this semester and it is indeed interesting...i would like to learn new softwares through my own interest

[RameshK]

Hi

As you said u have taken some course work in CFD, u might start with a code as in one of the replies. That would really really really give u insight of what ur Fluent does. The least one is to try your hands with various techniques for 1D Euler equations. If u can do this with out any trouble u can try 1D Euler equation with area variation which simulates the flow through the nozzle. This would make u learn some really good numerical methods and their implementations.

[priya_c45]

that would be great but i am not that good at coding.....i need some practice
for the c- language.Can u suggest me a few topics that i can do....i am not that highly skilled but i would definitely like to work hard...

[priya_c45]

how about this?..i create a comparison of the experiments made in fluent and then compare it with the results from the code..

[RameshK]

Hi Priya

Having said that you have only one month time then using Fluent to wind up your project is the correct option. Even with that if you have a simple geometry and good plan then you can complete it in one month. You may consider flow over super critical airfoil with various angles of attack. This is a simple project but will need a month to complete it.

or any problems like shock boundary layer interactions that would take place on supersonic aircrafts ducts. There are many papers on this topic and can choose any of the methods available in FLuent to compare the numerical method or an application where in this phenomenon can occur.

[priya_c45]

Hi

there is an update..we have two months according to our hod...so we need a good one to work upon...

[delaneyluke]

I would suggest, using Fluent for analysis and maybe ICEM CFD or Gridgen for grid generation ... and study flows over airfoils. You can get airfoil data (profiles) from the net. Study parameters like drag and lift. Compare with experimental data (if you can get hold of it). Now since this is very basic and won't take more than 2 weeks, attempt a parametric study. Change a parameter of your airfoil (chord length etc) and see it's effect on drag and lift.

This might sound very simple but the topic you suggested, "VISCOUS CFD ANALYSIS OF GENERIC MISSILE WITH GRID FINS" would not be easy for a CFD beginner.

For internal flows, alternately, you could study flow through a diffuser (very interesting) and study how parameters like area ratio and diffuser angle play a role in it's pressure recovery.

The simpler your topic the more you can learn, in 2 months.

Regards

[priya_c45]

Hi Luke

It was indeed tough to simulate 3D figures...i tried downloading the gridgen software but its without the license..i am not able to get hold of it as i am a student.I had another idea though, how about simulating the flow over a few missile configurations and then comparing them...just in 2D...and compare parameters like Cl , Cd and all that ...my professor says that it could be done but i am not able to get a hold about the gridgen software..
can u help me with this?

[DoHander]

@priya-c45

If you already have a valid Fluent license you should also have, depending on the version, access to Gambit or ICEM-CFD. Both of the above can be used to create meshes for your configurations.

If you really want to use Gridgen don't complain here it does not have a license, of course it doesn't because you didn't bought one!

For 2D configurations there are plenty of free mesh generations software, take for example Gmsh (this can generate 3D meshes too) or FreeFEM++ (this is a full blown solver but also contains a nice mesh generation facility).

Do

[priya_c45]

But i head that it was free....any way...thank you

[DoHander]

Nope, Gridgen is not free.
FreeFEM and Gmsh are free software.

Do

[delaneyluke]

Priya,
Don't be stuck on Gridgen, ICEM CFD is brilliant too and an industry standard in most cases. With regards to missiles, where are you going to get the geometric details from OR are you just going to assume profiles. Working with airfoils will be the same and give you experience on simulating flow around a body AND airfoil profiles are available on the internet.

[bravikanth]

hi priya,

What i can understand from the posts you wrote, you are a beginner in CFD. Taking complicated cases like missile is always difficult and you have very little stipulated time of two months. In order to do come out with some conclusion in this time gap is difficult. I suggest you better go with small test cases like Pipe flow, Ahmed body, Flow over 3D cylinder etc which should be sufficient enough to do comparisions with the experimental results as they are available on internet.

For Meshing you can use Open Foam if you know how to use it. Also you can do all your simulations using Open Foam as it is a open CFD Software.

BW,
Ravi