Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!
  • Students Click Here

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

Improve Tet mesh quality - Cube with multiple spheres

Improve Tet mesh quality - Cube with multiple spheres

Improve Tet mesh quality - Cube with multiple spheres

Hi All,

I am working on modelling of a cube with multiple spheres which induces extremely complex geometry.
Using free mesh provided in Abaqus, I am able to generate the tetrahedral mesh (C3D4 element

However, it is very bad quality mesh, there are many distorted elements (~500 element). I think it is impossible to use Mesh Edit to manually edit each element.
I've tried Virtual Topology. It doesn't work well. And the geometry is too complex for Partitioning.
Could you please suggest any solution to obtain a quality mesh for this geometry?
In case you are interested, I upload .sat file of this model.

RE: Improve Tet mesh quality - Cube with multiple spheres

What is your expectation? You will always have elements with warnings when meshing a complex geometry. Especially when it's a very irregular and partially thin walled solid. So if you have no error and 0.1% warnings, then this isn't a major problem. Just make sure, that you have good elements in regions where you expect large distortions and where you want to have a closer look at the stresses. And be careful with linear tets.

RE: Improve Tet mesh quality - Cube with multiple spheres

Thanks Mustaine3 for your suggestion.
I did run a test and it seems to be good although with element distortion warning.
Btw, Can you explain more about "be careful with linear tets"?
I still don't understand your warning about C3D4 element?

RE: Improve Tet mesh quality - Cube with multiple spheres

The formulation of linear tets is too stiff. In general - not only in Abaqus.
For realistic results you should use parabolic tets.

RE: Improve Tet mesh quality - Cube with multiple spheres

Thanks Mustaine3.
I thought linear tet is only stiff for bending case.
But I did a quick search and linear tet certainly is too stiff as you said.
Thank you.

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members! Already a Member? Login


White Paper - How ESI is Helping Move New Medical Device Product to Market Quicker & More Cost Effic
Early Supplier Involvement has long been a strategy employed by manufacturers to produce innovative products. Now, it almost seems like a necessity. Because decisions made in the design phase can positively affect product quality and costs, this can help add value to OEM bottom lines. This white paper will discuss many facets of ESI, including why it’s so valuable today, what challenges limit the benefits of ESI, how cost is impacted, and more. Download Now
White Paper - Moving to a Driverless Future
This white paper describes what we see as the best practices to support a sustainable engineering process for autonomous vehicle design. It exposes how to use simulation and testing in common frameworks to enable design exploration, verification and validation for the development of autonomous cars at a system, software and full-vehicle level to drive a mature product development process for automated driving. Download Now
Research Report - How Engineers are Using Remote Access
Remote access enables engineers to work from anywhere provided they have an internet connection. We surveyed our audience of engineers, designers and product managers to learn how they use remote access within their organizations. We wanted to know which industries have adopted remote access, which software they are using, and what features matter most. Download Now

Close Box

Join Eng-Tips® Today!

Join your peers on the Internet's largest technical engineering professional community.
It's easy to join and it's free.

Here's Why Members Love Eng-Tips Forums:

Register now while it's still free!

Already a member? Close this window and log in.

Join Us             Close