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-   -   [ANSYS Meshing] 2D Airfoil- From ICEM to FLUENT (http://www.cfd-online.com/Forums/ansys-meshing/118387-2d-airfoil-icem-fluent.html)

elio_xh May 26, 2013 23:06

2D Airfoil- From ICEM to FLUENT
 
Hi guys, I'm new to the world of CFD and one of the project I've taken up doing is running a simulation of a 2D airfoil in Fluent to determine the Cl and Cd. I've followed the ICEM 3 part youtube video on creating the mesh for my airfoil step by step and I'm happy with the quality of my mesh. However, when I open the exported ICEM mesh in Fluent, it doesn't have any boundary conditions besides the far field. I doesn't have the inlet and outlet. This wasn't covered in the video, so I really don't know how to setup an inlet and outlet. Every Fluent tutorial I see already has those boundaries, while mine only has these:http://i.imgur.com/6CVTtbz.jpg

If anyone can help me get this simulation to work I'd really appreciate it! I've been struggling with this over the past two days and it's really become frustrating.:mad: Thanks!

Far May 27, 2013 01:32

you must create corresonpding part (click on parts) and associate each edge to that particular boundary.

For example: In you have farfield BC for entire periphery. You should make two parts : 1. Inlet (or farfield) and 2. outlet (pressure outlet) . For this you need two step procedure:

1. Right click on parts > Create new part

Name it In and select the inlet curve

Repeat same procedure and create oulet part.

2. Associate edges to corresponding curves


For your airfoil boundary (wall) : did you delete the inner block? Did you specify the boundary condition?

What does crvs boundary represent in your case?

elio_xh May 27, 2013 08:01

Firstly, thank you for replying back to me so quickly! I'm still quite new at this so I have a few questions regarding what you said, and I'll try to answer your questions as best as I can:

Quote:

Originally Posted by Far (Post 430170)
you must create corresonpding part (click on parts) and associate each edge to that particular boundary.

For example: In you have farfield BC for entire periphery. You should make two parts : 1. Inlet (or farfield) and 2. outlet (pressure outlet) . For this you need two step procedure:

1. Right click on parts > Create new part

Name it In and select the inlet curve

Repeat same procedure and create oulet part.

2. Associate edges to corresponding curves

Do I create these parts in addition to my farfield BC, or do I have to start the mesh all over, and only have 4 curves: the top and bottom that are FF, and the left and right that are INLET & OUTLET? Can i do these steps even though I'm already done meshing?

Quote:

Originally Posted by Far (Post 430170)
For your airfoil boundary (wall) : did you delete the inner block? Did you specify the boundary condition?

What does crvs boundary represent in your case?

I did delete the inner block, and the boundary condition for the curves is a wall. This is the blocking I have for the airfoil:http://i.imgur.com/s2egKBC.jpghttp://i.imgur.com/GC09InB.jpg

Also, in regards to associating the edges to curves, which edge do I need to associate the inlet and outlet to? As you can see in the second image, my airfoil has a blunt trailing edge so I didn't collapse the blocks like in the tutorial video. Do I associate the curves to the vertical blue lines or the black lines?

elio_xh May 27, 2013 20:51

So I think I've understood how to generate the Input and output boundary conditions now I'm receiving a fatal error when importing the ICEM mesh into FLUENT. I'm pretty sure it's because my assocations are wrong, but I've followed the tutorial and all my lines are green.
I've attached a link to my project if anyone would like to look at it and help me figure out where I went wrong.

http://www.filedropper.com/smoothed4

Far June 1, 2013 02:53

Where is the project ?

elio_xh June 1, 2013 10:28

Sorry, I don't know why it deleted it. I'll upload again to Dropbox:

https://dl.dropboxusercontent.com/u/...OOTHED%204.prj

Far June 1, 2013 14:50

it is only .prj. We need .tin and .blk (or at least .tin)

elio_xh June 1, 2013 15:35

Sorry about that, I'm pretty new at all of this. I'll upload everything I have in that folder pertaining to that project file:

https://www.dropbox.com/sh/zh9fsepklvrrx2n/4x4wzwZdwl


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