CFD Online Discussion Forums

CFD Online Discussion Forums (http://www.cfd-online.com/Forums/)
-   ANSYS Meshing & Geometry (http://www.cfd-online.com/Forums/ansys-meshing/)
-   -   [ICEM] [ICEM CFD] Mesh has uncovered faces (http://www.cfd-online.com/Forums/ansys-meshing/113332-icem-cfd-mesh-has-uncovered-faces.html)

FJSJ February 18, 2013 05:29

[ICEM CFD] Mesh has uncovered faces
 
1 Attachment(s)
Hi,

i want to resolve an aerogenerator blade. But my flow domain is a little bit complex. For this reason, firstly Im trying to simplify my geometry and flow domain and im trying to resolve something easier. Ive done a first blade without twist and a flow domain like tutorial ICEM CFD Hexa 2D Airfoil meshing from youtube. Ive done the mesh and the same steps in tutorials ICEM CFD, convert to unstruct mesh and apply boundary condition and then I try write input and i get a message like this:

WARNING: Mesh has uncovered faces. Fluent needs a complete boundary (shells in 3D) or it will give a variety of errors and not read in the mesh!

obviously when i open the mesh in fluent... gives me an error.

Thank you in advance

diamondx February 18, 2013 10:57

Your blocking strategy is not good, you have to add o-grid around the wing. altough this is not the cause of you error... do a search of the terms "blocking" "wing" the subject has been treated thousands of time in the forum. if you can share your project , please do so...

FJSJ February 18, 2013 11:32

1 Attachment(s)
Hi diamondx,

my blocking strategy has a o-grid. I have donde exactly the same, like video i wrote before. Im thinking that im doing something wrong when i associate edgo to curve. Yes, i did your search but i cant solve the problem. I can share my project of course.

Thank you for your coment

diamondx February 18, 2013 13:08

look at what you have below, these are very bad elements:

https://dl.dropbox.com/u/35161486/fjsj.PNG

Follow the steps in this video, Mr FAR is meshing a 3d model...

http://www.youtube.com/watch?v=mgjRT4WY_iA

Of course come back to us you can't do it

FJSJ February 18, 2013 15:23

1 Attachment(s)
Hi diamondx,

thank you for your answer. Ive seen this video before and Ive done Hexa Mesh Generation for a Pipe with Embedded Blade tutorial cos is very similar. Now im attaching a picture of my quality premesh. You said me before that i have to do an o-grid. I did it. But this edges (o-grid) I associated them to the profile (this profile is on the wall), for this reason i think you said this before. I think that is confused and as you can see, all this bad elements are on the wall. I dont know if you can understand me. Maybe this is the problem? On the other hand the two vertices youve marked are not associated with any point (like video in youtube about meshing 2D profile).
Thank you again.

diamondx February 18, 2013 15:49

what i showed you in the picture was not about the vertices but squeezed element ... you are using 2x2x2 determinant to check a quality of a 3d geometry, use 3x3x3...
I'm not sure i understood what you said.

This is the kind of blocking you should make :

https://dl.dropbox.com/u/35161486/swept_wing_2.png

FJSJ February 19, 2013 11:55

Hi diamondx,

I understood your blocking strategy. I did it. But, before i want you see my mistakes and how i did the o-grid blocking. Now, i understand why all bad elements were fixing on wall. If you dont mind I`ve uploaded a video with the first o-grid i did. This way you can see what i refered yesterday.

http://www.youtube.com/watch?v=pxkBO...ature=youtu.be

And now I got your blocking strategy (i think so)

http://www.youtube.com/watch?v=z7rsV...ature=youtu.be

Please, can you comment the mistakes?

I want to make sure before other more complex level.

Thank you a lot.


All times are GMT -4. The time now is 10:52.