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Reflected Mesh association with Surface

Hi,

While meshing, I had to perform a bunch of element reflection operations to get a better mesh, especially around holes. Now the problem is, Femap is somehow not considering the reflected mesh as part of surface. If I try to mesh another strip of surface just below, Femap does not create elements just below the reflected entities. I have encountered this issue before as well. I have performed check coincident nodes operation and combined the nodes to create continguous mesh but still the issue persists. 

 

A picture to illustrate my issue

 

3 REPLIES

Re: Reflected Mesh association with Surface

Dear Nagaraj,

Do not reflect the surface, but the solid, use command GEOMETRY > REFLECT > SOLID, and activate flag for mesh sizing, etc ..., then the reflected sheet solid will have all the meshing attributes prescribed to the surface and you will be able to mesh the reflected surfaces with success, OK?.

 

reflect-solid.png

 

Best regards,

Blas.

Blas Molero Hidalgo, Ingeniero Industrial, Director
IBERISA • 48004 BILBAO (SPAIN)
WEB: http://www.iberisa.com
Blog Femap-NX Nastran: http://iberisa.wordpress.com/

Re: Reflected Mesh association with Surface

Hi Blas,

Thanks for responding. I am afraid you may have misunderstood my posting. I had to reflect mesh (elements) across a hole (as shown in pic #1). I had divided the hole in to 4 regions. Femap would give a beautiful mesh on one side of the hole but a bad quality mesh on the other side. So, I decided to mirror or reflect, the good quality mesh across the hole so that I would end up with good quality mesh on both sides of the hole.

 

Unfortunately, Femap doesn't associate the mirrored elements to the surface, as shown in pic #2 and thus subsequent meshing of a surface below produces a mesh with empty region near the mirrored elements of the adjoining surface.

 

Anyways, I overcame the above by manually moving nodes/elements etc., but an easier option would be nice since the manual method is time consuming.

Re: Reflected Mesh association with Surface

Dear Nagaraj,

I suggest always to reflect solid geometry, not mesh, as explained in my last post the solid geometry already have information of the meshing attributes (please note, sheet solid, not simply "surface"). Not only meshing attribute, but also loads & boundary conditions, contacts, etc.. all is transfered as well, then meshing is inmediate.

 

I do reflect or copy mesh as well many times, depending the case, specially when dealing with holes and Shell mesh, in this case I spend time preparing the geometry (midsurfacing, washer, imprints, pads, etc..) one time, mesh and reflect or copy mesh.

 

After reflecting the mesh on top of the plain midsurface geometry (without pads, washer, etc..) the target is to use command MODIFY > ASSOCIATIVITY > AUTOMATIC to associate the nodes & elements to the main entity (surfaces/sheet solids), the mesh will also be associated to the curves on those surfaces, and points on those curves allowing you to use geom­etry based commands in FEMAP (i.e., Loads and Constraints on geometry, etc.), this approach is critical!!.

 

Best regards,

Blas.

Blas Molero Hidalgo, Ingeniero Industrial, Director
IBERISA • 48004 BILBAO (SPAIN)
WEB: http://www.iberisa.com
Blog Femap-NX Nastran: http://iberisa.wordpress.com/