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Re: Meshing Small Fluid Elements Help

Hi Blas,

 

Thanks for the Hex meshing video! However, the rest of the model has complex geometry that will require TET elements, so I'll wait for you to record another video that shows TET meshing.

 

Thank you so much for your help!

Re: Meshing Small Fluid Elements Help

Solution Partner Phenom Solution Partner Phenom
Solution Partner Phenom

Hello!,

In this video you will learn how to mesh an Assembly of 3D solids geometry with Tetrahedral solid elements with mesh transition and with the help of "GEOMETRY > SURFACES > NonManifold-Add" command, an option in the Parasolid modeling kernel of FEMAP which creates “General Bodies” as opposed to regular solids.
The use of "Geometry, Surface, Recover Manifold Geometry" command will separate all components into regular solids where the imprints between surfaces remains, making possible the "adjacent surface matching". This step is critical when you are specifying sizes on multiple solids at the same time, setting a “slaved” mesh approach on surfaces that are adjacent to each other and which are the same size, assuring a consistent mesh. The mesher will automatically find surfaces which are adjacent between multiple solids and slaves them to each other, making node merging possible.


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: Meshing Small Fluid Elements Help

Hi Blas,

 

I successfully used the approach you show in the video to mesh the simple model, but when I tried it for the full model, I'm running into mesh errors saying "Unable to link mesh locations between Surface XXX and Surface YYY. Surfaces much be on same solid or coincident "

 

When I look at the surfaces, they appear to be coincident so I'm not sure why the surfaces are unable to link.

 

Thanks again!

Re: Meshing Small Fluid Elements Help

Solution Partner Phenom Solution Partner Phenom
Solution Partner Phenom

Hello!,

This is surely related with internal tolerances used by the mesher, working in meters could be the source of the problem, this is why the first I did was to convert your simply model from meters to milimeters using command TOOL > CONVERT UNITS. Also, for successful linking, both surfaces should be identical & adjacent/coincident to each other in space, and closely aligned.

Please note when surfaces are on different solids, they are meshed by matching the closest points on the surfaces. For this reason, to mesh properly, the surfaces must be positioned and aligned so that the points on the curves that are closest to each other result in the proper mapping between the surfaces. Surfaces that are rotated arbitrarily in space relative to each other will usually not meet this criteria. Again, this mode is primarily intended for matching adjacent surfaces between multiple solids.

Revise that both surfaces that give error have exactly the same points. Also, you can define "by hand" the matching using command "Mesh > Mesh Control > Approach on Surface > Matched - Link to Surface"

approach-on-surface-matched-link-to-surface.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: Meshing Small Fluid Elements Help

Hi Blas,

 

Converting to milimeters from meters helped. I was able to mesh without a problem after converting to milimeters. Would I be able to convert back to meters after meshing and before continuing to work on my model? All of my boundary conditions, properties, thermal contacts, etc are in meters and I have TMG solver set to Meter/Newtons/Celsius.

 

 

Thank you so much for your help!

 

 

Re: Meshing Small Fluid Elements Help

Solution Partner Phenom Solution Partner Phenom
Solution Partner Phenom

Hello!,

Yes, of course, once meshed you can convert back to meters (to SI system, International System of Units) the full FEMAP database using the same TOOLS > CONVERT UNITS command, take a look to the HELP (click F1 when the command is activated) because not a conversion factor file mm-to-meters.CF exist in the FEMAP database, then you need to create yours.

convert-units.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/
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Re: Meshing Small Fluid Elements Help

Thank you for all of your help!