Extract the coordinate of the nodes located on the boundary

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crayon posted this 18 April 2019

Hello everyone,

I have generated a tetrahedral volumetric mesh of a bounding box (nearly a cuboid). I wonder how to extract the coordinate of the nodes located at the boundary of the bounding box. I want to generate the displacement of these nodes (by combination with other displacement vector fields) and use them as constraint of subsequent fem boundary condition.
Your help is greatly appreciated!

Crayon

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kkanade posted this 4 weeks ago

in fluent you can export asci file which will have nodes and coordinates. 

crayon posted this 4 weeks ago

Thanks. But how can I identify which nodes are located on the boundary of the volumetric mesh? Can I extract coordinate of these nodes? Can I accomplish this using Ansys APDL? Hope for your advice!

Crayon

kkanade posted this 4 weeks ago

you can select particular boundary zone 

peteroznewman posted this 4 weeks ago

Crayon,

This might be what you are looking for.

Regards,
Peter

crayon posted this 4 weeks ago

Thank you. I have seen this discussion before. But what I need is not the nodal coordinates after deformation. In fact, I want to extract coordinates of the nodes which are located on the boundary of my volumetric mesh (the volumetric mesh was generated from stl file which is a surface mesh originally). After extracting the coordinates of boundary nodes, I can then get the displacement of these nodes (combined with other results) and further use them as boundary condition of fem (In other words, I want to load the displacement of boundary nodes). Also I want to know how to apply displacement of many certain nodes in Ansys (maybe using apdl?). I guess my problem is quite infrequent because I have been looking through many forums but still can't find the proper way to solve it. Your help is greatly appreciated!

Crayon

crayon posted this 4 weeks ago

Thank you. But could you please tell more details? In fact, I have a stl file which is a surface mesh segmented from human anatomy and then I generate volumetric mesh in Ansys ICEM. What I need to do is extracting the coordinates of boundary nodes, then I can get the displacement of these nodes (combined with other results) and further use them as boundary condition of fem (In other words, I want to load the displacement of boundary nodes). What do you mean by selecting particular boundary zone? Combined with surface mesh representing the object? I have no idea exactly. Your advice is highly appreciated!

Crayon

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