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-   -   Urgent Problem with Hypermesh and CFX (http://www.cfd-online.com/Forums/cfx/25338-urgent-problem-hypermesh-cfx.html)

Luk February 29, 2008 06:12

Urgent Problem with Hypermesh and CFX
 
Hi all, I have strange problem with exporting mesh from Hypermesh to Ansys CFX. I'll try to describe it: - I have a very simple model of cube, with airflow through, - I preapre surface mesh in HM, - from these surface elemens I perform volume meshing (in HM also) with prism boundary layers, forming PENTA ELEMENTS. - when I export it to CFX (through nastran format) I found that there are holes inside model just next to boundary layers. I was digging here a little bit and found that this is because there are pyramid5 elements which are not handled by nastran template in HM, - going back to HM i decided to split every penta5 element into two tetra4 elements. This division is performed such a way, that penta5 side with 4 nodes is split into halves and shared between tetras. My problem is that if I export it to CFX it produeces faces on these surfaces (split sides of penta5 elements). Now I have no holes in geometry, but there are surfaces inside the cube (like plane elements for boundaries).

Can anyone any experience how to handle this problem? I would be very grateful for help because matter is very urgent.

Luk

CycLone February 29, 2008 10:49

Re: Urgent Problem with Hypermesh and CFX
 
Try exporting through CGNS.

Luk February 29, 2008 11:18

Re: Urgent Problem with Hypermesh and CFX
 
Thanks for Your help but I simply must ask this question: how to do that from HM? I have HM 7.0 and there is no such option for export nor for template to load. It would be very real great to solve it.

Luk

CycLone February 29, 2008 12:30

Re: Urgent Problem with Hypermesh and CFX
 
I have no idea, have you contacted Hypermesh support?

Luk February 29, 2008 12:40

Re: Urgent Problem with Hypermesh and CFX
 
At the moment I am trying to do it myself. I found that, there are only 3 templates in hm (for hm, pamcrash and madymo) which can handle the pyramid5 elements properly.

Luk

kamalhasan.kasi March 14, 2008 06:59

help me please
 
hi i got one component with 10 mm mesh.my client asked me to that do with 5mm mesh with in a short time.shall re mesh 10mm to 5 mm. if do like this will i get any problem in Q.C.and will it come as per the geometry.

thanking u,

yours obediently,

kamalhasan.kasi


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