Turn on suggestions

Auto-suggest helps you quickly narrow down your search results by suggesting possible matches as you type.

Showing results for

- Navigation
- Simcenter
- Forums
- Blogs
- Knowledge Bases

- Siemens PLM Community
- Simcenter
- CAE Simulation - Femap Forum
- Hex mesh T tube joints

Options

- Start Article
- Subscribe to RSS Feed
- Mark Topic as New
- Mark Topic as Read
- Float this Topic for Current User
- Bookmark
- Subscribe
- Printer Friendly Page

- Mark as New
- Bookmark
- Subscribe
- Subscribe to RSS Feed
- Permalink
- Email to a Friend
- Report Inappropriate Content

01-03-2018 07:19 AM

Hello everyone,

Does anyone know how to properly hex mesh a T tube joint in FEMAP?

I have tried several approaches, deviding the surfaces, extruding, etc. See the attached image for example.

A general approach for T tube joints of same diameter would be nice, if possible.

Thanks in advance.

Solved! Go to Solution.

9 REPLIES 9

- Mark as New
- Bookmark
- Subscribe
- Subscribe to RSS Feed
- Permalink
- Email to a Friend
- Report Inappropriate Content

01-03-2018 08:35 AM

Dear Igor,

Is very easy, for instance a T-Join tube of external diameter Ø220 mm and thickness 10 mm:

Simply split solid (use command **GEOMETRY > SOLID > SLICE**) using symmetry planes. Also use the length of the external arc to split the horizontal tube by plane X-Y. Next use the resulting distance "A" to split the vertical tube by plane X-Z. Also split the solid by the intersection plane of the two tubes, and you are done!.

Next use an element size to have 3 elements in the thickness or so, you will need to "tune" the number of elements to have a regular "mapped" mesh, play with number of divisions using the MESHING TOOLBOX to have the same number of elements at opposite curves, here you are mine:

And finally mesh the geometry using HEX elements, the resulting mesh will have the following element quality:

Check Element Quality 32655 Element(s) Selected... No Elements Outside of Maximum Allowable Value. Quality Check Number Failed Worst Value Hex AR 0 3.345548 Hex DetJ 0 3.713188 Hex Warp 0 0.999913 0 Elements Failed out of 32655 Checked.

Try yourself and enjoy!.

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/

IBERISA • 48004 BILBAO (SPAIN)

WEB: http://www.iberisa.com

Blog Femap-NX Nastran: http://iberisa.wordpress.com/

Re: Hex mesh T tube joints

- Mark as New
- Bookmark
- Subscribe
- Subscribe to RSS Feed
- Permalink
- Email to a Friend
- Report Inappropriate Content

01-03-2018 09:05 AM

Hi Blas,

Sorry, i think i did not make my question very clear, i intend to mesh the full volume for a CFD simulation.

The volume inside a tube.

Re: Hex mesh T tube joints

- Mark as New
- Bookmark
- Subscribe
- Subscribe to RSS Feed
- Permalink
- Email to a Friend
- Report Inappropriate Content

01-03-2018 10:07 AM - edited 01-03-2018 10:09 AM

Try using the command Geometry > Solid > Fill Hole and select one of the inner diameter arcs of the tube.

You can then use the method that Blas has shown to slice the solid and hex mesh the part.

Before:

After (hiding the original solid):

Re: Hex mesh T tube joints

- Mark as New
- Bookmark
- Subscribe
- Subscribe to RSS Feed
- Permalink
- Email to a Friend
- Report Inappropriate Content

01-03-2018 11:43 AM

Let me explain my problem a little further.

Here is all of my geometry:

Here are some of the joints, that are giving me trouble.

This is an "OK" mesh for CFD:

The ideal would be to have the mesh that i plan to extrude all over the model, but i dont know if that will be possible due to the joints, so basically i am trying to hex mesh the volume including the joints.

This is just to elaborate further my problem in case anybody else looks at this post.

@Blas_Molero and @T_Giampietro

Thank you both for your sugestions, i am going to try that right now. If it works i will post the result here.

Att

Igor

Re: Hex mesh T tube joints

- Mark as New
- Bookmark
- Subscribe
- Subscribe to RSS Feed
- Permalink
- Email to a Friend
- Report Inappropriate Content

01-03-2018 12:33 PM

Hello everyone,

It has worked when i followed @Blas_Molero's method.

@Blas_Molero thank you very much, i have a couple more question if you dont mind.

1- How do i plot the element quality like you did?

2- Do you think its possible to make a mesh like this :

Throughout the joints using the method you just posted? I'm going to try that now.

Thanks.

@T_Giampietro thank you very much too.

Att

Igor

Re: Hex mesh T tube joints

- Mark as New
- Bookmark
- Subscribe
- Subscribe to RSS Feed
- Permalink
- Email to a Friend
- Report Inappropriate Content

01-03-2018 12:53 PM

In the dialog box check "Show Model Data Contour" and expand Element Quality to select the criteria you would like to show.

Re: Hex mesh T tube joints

- Mark as New
- Bookmark
- Subscribe
- Subscribe to RSS Feed
- Permalink
- Email to a Friend
- Report Inappropriate Content

01-03-2018 02:14 PM

Dear Igor,

Well, I can do it, but takes time, is not immediate, with multiple joints at different orientation many solid splitting are required, and to arrive to a **consistent HEX mesh** with multi-solid sizing at the same time is complex, not doubt. Hopefully FEMAP in the future can make it at the push of a button?, we will see!

2- Do you think its possible to make a mesh like this :

Throughout the joints using the method you just posted?

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/

IBERISA • 48004 BILBAO (SPAIN)

WEB: http://www.iberisa.com

Blog Femap-NX Nastran: http://iberisa.wordpress.com/

Re: Hex mesh T tube joints

- Mark as New
- Bookmark
- Subscribe
- Subscribe to RSS Feed
- Permalink
- Email to a Friend
- Report Inappropriate Content

01-03-2018 04:31 PM

Many thanks, it worked

Re: Hex mesh T tube joints

- Mark as New
- Bookmark
- Subscribe
- Subscribe to RSS Feed
- Permalink
- Email to a Friend
- Report Inappropriate Content

01-03-2018 04:34 PM

Anyway, thanks for the help

Att

Start with these Femap Basics videos

Watch Femap How To videos on YouTube

Watch Femap Tips & Tricks videos on YouTube

Download the Femap 45 day Free Trial

Download the Femap Student Edition

Watch Femap How To videos on YouTube

Watch Femap Tips & Tricks videos on YouTube

Download the Femap 45 day Free Trial

Download the Femap Student Edition

Follow Siemens PLM Software

© 2019 Siemens Product Lifecycle Management Software Inc