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Urgent Problem with Hypermesh and CFX

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Old   February 29, 2008, 06:12
Default Urgent Problem with Hypermesh and CFX
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Luk
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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
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Old   February 29, 2008, 10:49
Default Re: Urgent Problem with Hypermesh and CFX
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CycLone
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Try exporting through CGNS.
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Old   February 29, 2008, 11:18
Default Re: Urgent Problem with Hypermesh and CFX
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Luk
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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
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Old   February 29, 2008, 12:30
Default Re: Urgent Problem with Hypermesh and CFX
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CycLone
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I have no idea, have you contacted Hypermesh support?
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Old   February 29, 2008, 12:40
Default Re: Urgent Problem with Hypermesh and CFX
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Luk
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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
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Old   March 14, 2008, 05:59
Default help me please
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kamalhasan.kasi
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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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