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Entity sets for Contact modeling

Hello,

I am modeling contact stress in the patellofemoral joint. I have models that have been meshed and made in Hypermesh and are being exported into a .cdb file to be read and analyzed using ANSYS 14.5. I have created a entity set in Hypermesh of nodes to allow me to use the contact wizard in ANSYS. I have been able to successfully import the model and run my simulation however the models are not initiating contact. I was talking with my PI and he suggested that perhaps the entity set is causing the nodes to lose association with their corresponding nodes. This is preventing contact from occurring. Is this the case? And if so how do I remedy the situation?

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Altair Forum User

Hi ladnimo

What is the version of HyperWorks are you using and their updates?

to find out version and updates follow this link http://forum.altairhyperworks.com/index.php?/topic/13435-to-identify-the-software-updatepatch-that-has-been-installed-in-your-machine/

Ansys 14.5 is officially supported from HW 12.0 with 110 update. Please confirm your updates.

Altair Forum User

Hello Prakash Pagadala,

I am currently using hypermesh 12.0. Which number corresponds to the update? The information is as given. Thank you for your help.

Altair Home: C:/Program Files/Altair/12.0

Updates Information:

------------------------------------------------------------

acusolve12.0

hwdesktop12.0

hwdesktophelp12.0

hwsolvers12.0

hwsolvershelp12.0

Versions:

------------------------------------------------------------

hgtrans.exe: 12.0.0.85 (Feb 8 2013)

hm12.dll: 12.0.0.85 (Feb 8 2013)

hmopengl.exe: 12.0.0.85 (Feb 8 2013)

hst_ng.exe: 12.0.0.85.437093 (Feb 8 2013)

hstbatch_ng.exe: 12.0.0.85.437093 (Feb 8 2013)

hstdss.exe: 12.0.0.85.437093 (Feb 8 2013)

hvp.exe: 12.0.0.85 (Feb 8 2013)

hw.exe: 12.0.0.85 (Feb 8 2013)

hwmbdmodel.dll: 12.0.0.85 (Feb 8 2013)

hwplot.dll: 12.0.0.85 (Feb 8 2013)

hwplot3d.dll: 12.0.0.85 (Feb 8 2013)

hwpost.dll: 12.0.0.85 (Feb 8 2013)

hwtext.dll: 12.0.0.85 (Feb 8 2013)

hwvideo.dll: 12.0.0.85 (Feb 8 2013)

hwx.exe: 12.0.0.85 (Feb 8 2013)

templex.exe: 12.0.0.85 (Feb 8 2013)

Altair Forum User

Hi,

Can you update to the latest patch and check if you are able to get reasonable results?

You can download the updates from http://www.altairhyperworks.com/ClientCenterHWUpdateDownload.aspx?pro_cat=HyperWorks

Altair Forum User

Hello,

Sorry for the delay in getting back. I was sorting out the update and license with another student. We have Hypermesh 13.0 now. I just wanted to check to see if this system information is compatible with ANSYS 14.5

Altair Home: C:/Program Files/Altair/13.0.110

Updates Information:

------------------------------------------------------------

hwdesktop13.0.110

Versions:

------------------------------------------------------------

hgtrans.exe: 13.0.110.31 (Jan 6 2015)

hmobj.dll: 13.0.110.31 (Jan 6 2015)

hmopengl.exe: 13.0.110.31 (Jan 6 2015)

hst.exe: 13.0.110.31.692825 (Jan 6 2015)

hstbatch.exe: 13.0.110.31.692825 (Jan 6 2015)

hstdss.exe: 13.0.110.31.692825 (Jan 6 2015)

hvp.exe: 13.0.110.31 (Jan 6 2015)

hw.exe: 13.0.110.31 (Jan 6 2015)

hwmbdmodel.dll: 13.0.110.31 (Jan 6 2015)

hwplot.dll: 13.0.110.31 (Jan 6 2015)

hwplot3d.dll: 13.0.110.31 (Jan 6 2015)

hwpost.dll: 13.0.110.31 (Jan 6 2015)

hwtext.dll: 13.0.110.31 (Jan 6 2015)

hwvideo.dll: 13.0.110.31 (Jan 6 2015)

hwx.exe: 13.0.110.31 (Jan 6 2015)

templex.exe: 13.0.110.31 (Jan 6 2015)

Altair Forum User

Hi,

Ansys 14.5 is supported from 12.0.110 update and also in 13.0;

Altair Forum User

Hello Prakash,

I have been playing around with a few things and I have gotten some interesting results. I am able to export and import as much as I like without any problems. However when I go to solve the system crashes and doesn't get anywhere. I think I have established everything correctly. My current attempts are just 2 basic blocks that will be moved into contact. I have a solid hexahedral mesh made with the loose shrink wrap function with solid 185 elements established in the component table. My understanding is that this is all I need to do in hypermesh in order to export models into ANSYS mechanical APDL. I establish all other loading conditions in ANSYS. Am I missing a step on the hypermesh side? If not I think my problems lie in ANSYS and I will seek help there. Thank you very much for your help so far.

Rahul Rajan_21763

Since you have used wrapper mesh there is chance that element quality of hex mesh might not be good.Please check element quality.

As you have mentioned it is crashing in Ansys mechanical.you can check with Ansys support as well.

Regards

Rahul R