|
[Sponsors] |
June 12, 2009, 18:35 |
icem hexa mesh parts pb
|
#1 |
New Member
Join Date: Apr 2009
Posts: 18
Rep Power: 17 |
Hello dear colleagues,
I’m simulating a flow over a symmetrical NACA airfoil using ANSYSCFX11.so,to have a multiblock structured mesh, I have done a 2d extruded mesh using ICEM HEXA(v11).the steps followed are: 1-generating 2d geometry (airfoil+rectangular domain) using a scripts file. creating parts representing geometry families. 2-2d blocking (several operations) and 2d mesh. 3-extruding (1 layer) the 2d mesh after converting to unstructured mesh. Results: having a 2d extruded mesh. But parts still representing lines and not sides. making pb to introduce boundary conditions (inlet,outlet,wall and airfoil). please, I will be grateful to receive any idea or suggestions. Last edited by jaber; June 12, 2009 at 18:58. |
|
June 15, 2009, 10:49 |
were your line elements turned off or not selected?
|
#2 |
Senior Member
Simon Pereira
Join Date: Mar 2009
Location: Ann Arbor, MI
Posts: 2,663
Blog Entries: 1
Rep Power: 47 |
In 2D to 3D, line elements become shells, points become lines. So, if you had line elements around the perimeter of your 2D model, they would become shells when you extruded to your 3D model. Perhaps you had the line elements off and selected only the 2D shells and 0D nodes for extrusion? This would give you volume elements and line elements, but not shell elements…
|
|
June 15, 2009, 10:52 |
Check edge associations
|
#3 |
Senior Member
Simon Pereira
Join Date: Mar 2009
Location: Ann Arbor, MI
Posts: 2,663
Blog Entries: 1
Rep Power: 47 |
One other possibility is that when you created the blocking, you did not associate all the edges to the curves. This is a common mistake, particularly with the straight far field boundary (people don’t think they need to because it already looks right). Surface projected edges do not create line elements when converted to unstructured mesh, which means you wouldn’t have anything to convert to shells in 2D to 3D.
The fix is to go back to your blocking step and make sure to set up associations for all your perimeter edges… Then continue with your previous process. |
|
July 5, 2009, 07:23 |
thanks
|
#4 |
New Member
Join Date: Apr 2009
Posts: 18
Rep Power: 17 |
thanks Simon.the second one helps well.
but there is a pb whith some lines and shells that need not to be(on profile part,and top part). Last edited by jaber; July 7, 2009 at 19:20. |
|
Thread Tools | Search this Thread |
Display Modes | |
|
|
Similar Threads | ||||
Thread | Thread Starter | Forum | Replies | Last Post |
icem hexa mesh beginner | icem beginner | FLUENT | 2 | July 9, 2008 08:27 |
ICEM hexa mesh 2d car example | icem student | Main CFD Forum | 0 | May 11, 2008 20:17 |
ICEM hexa mesh tutarial 2d car problem | cfduser | CFX | 2 | March 9, 2008 10:40 |
CFX mesh & ICEM | mike | CFX | 3 | April 27, 2006 16:27 |
mesh adaptation for hexa mesh | Pete | CFX | 4 | April 6, 2005 19:43 |