I suppose that you need to apply boundary condition to the selected nodes...

Well Matlab is not good enough for this because you need to write down the subroutine how you exactly have created these nodes - it means that if you know how you have created the model then you are writing a macro to  combine nodes into a component.

Working only with ANSYS, of course, there is  the "selecting by picking " option in which  you are selecting options like "box", "polygon" or "circle" instead of "single" within the "select nodes" picking menu. This takes time, but it works!

Meanwhile, there is a professional tool to work with your problem /import-export in various CAD formats as well as in any FE looking formats (elements+nodes) and futher transformation into ANY FE format (ANSYS, ABAQUS, LS-DYNA etc) This tool also allows to correct your CAD for meshing and apply any boundary condition. This is "Hypermesh" from http://www.altairhyperworks.com

For selecting all nodes attached to a surface

In ANSYS APDL utility menu

Goto Select > Entities> Area (First drop down tab)> OK> (Select the surface containing nodes)

Again Goto Select > Entities> Nodes (First drop down tab)> Attached to (Second drop down tab)> Areas,all> From full>OK

Hopes this will help.

In order to clear the selection Select> Everything in the utility menu

Dear Sajith, the point is i have no area, cause i have an imported model...

I suppose that you need to apply boundary condition to the selected nodes...

Well Matlab is not good enough for this because you need to write down the subroutine how you exactly have created these nodes - it means that if you know how you have created the model then you are writing a macro to  combine nodes into a component.

Working only with ANSYS, of course, there is  the "selecting by picking " option in which  you are selecting options like "box", "polygon" or "circle" instead of "single" within the "select nodes" picking menu. This takes time, but it works!

Meanwhile, there is a professional tool to work with your problem /import-export in various CAD formats as well as in any FE looking formats (elements+nodes) and futher transformation into ANY FE format (ANSYS, ABAQUS, LS-DYNA etc) This tool also allows to correct your CAD for meshing and apply any boundary condition. This is "Hypermesh" from http://www.altairhyperworks.com

dear Alexander,

Hi.

yes, I'm familiar with HM and have done some FE with Optistruct...

I use Avizo to create a 3D model of some bony parts. using Avizo I can have all my model (separate bone pieces) all together in Ansys using .unv format and then converting it to a txt file loadable in ansys...

I think if I use HM, I must do lotsof work to define contact surfaces...

Dear Arsalan,

if your problem is dominantly "contact problem" then the most efficient way is to run LS-DYNA - the most powerfull search algorithm allows to run problem with "self-contact" without additional specification of contact surfaces. Many researchers (including my collegues) have been turning their computations from ANSYS and ABAQUS into LS-DYNA exactly due to this mentioned problem (a lot of contact surfaces)

hello my dear

I miss you.

have a good time.

best regard.

 Mr. A. Marghoub

Dear Sajith S,

Thanks, That helped a lot.

I wanted to assign Material attributes to a large number of element.

However, I still have problem. because now with your guide I can select them by I can not keep it to modify attributes. Do you know how should I do that?

thanks.

Dear Sajith S,

Thanks, That helped a lot.

I wanted to assign Material attributes to a large number of element.

However, I still have problem. because now with your guide I can select them by I can not keep it to modify attributes. Do you know how should I do that?

thanks.

i have meshed my 3-d model(pressure vessel) in hypermesh. After importing .cdb file into ansys apdl i am unable to select areas to apply pressure on the inside surface of the vessel. Can anyone suggest how to select the elements only on the inside of the surface all together in ansys apdl

Do you define the inside of your vessel as a material?

If yes, then it is easy, you just need to select the external nodes of that material.