Learning Forum

[swathipharmacoo]

Hi, here i want to do static structural analysis for this geometry. I assigned virtual topology, but cant able to generate mesh. Please help to solve this issue.

[swathipharmacoo]

 

Here iam attaching Space claim file.https://drive.google.com/file/d/1QWwHc43E-yl4IjnjPSxAnBbsqH-YovYb/view?usp=sharing

 

[ErKo]

Ansys employees  can not open/download files - other forum members can chime in here and help perhaps (@peteroznewman).

All the best

Erik

[swathipharmacoo]

Please check this link.

https://drive.google.com/file/d/1eoCzrWXuLCvqfNw-NthOGPvfxcIV8S7J/view?usp=sharing.

 

[peteroznewman]

Opened in ANSYS 2025 R1, used Virtual Topology as shown:

Mesh settings:

[swathipharmacoo]

Thank you for your quick response.  I want to do  static structural analysis. In the above mesh settings you used Explicit method in physics preference. When i use Mechanical, then i could not able to generate. Here iam attaching the file.

https://drive.google.com/file/d/1xYxx8QvqcuNNXfM4YfJtXV6KB6CBxGh4/view?usp=sharing

[peteroznewman]

Don't use Mechanical as the Physics Preference because it fails to complete the mesh. 

The important difference between Explicit and Mechanical Physics Preferences is that the Explicit solver must use linear element order, while the Mechanical solver can use either linear or quadratic elements. The other difference between Explicit and Mechanical meshing preferences is in the size and shape of the elements.  Explicit meshing attempts to keep elements near to a uniform size and closer to an ideal shape, while Mechanical meshing does not, and I believe this is what enables the success.

You can leave the Physics Preference set to Explicit, but override the default setting and change Element Order to Quadratic.  In that way, you will get high element quality and Quadratic element order.

Note that this mesh has a similar element count as the linear mesh, but the node count went from 0.7 million to 5.4 million. I hope you have a lot of storage (like 2 TB free) to hold results and a lot of time and a lot of RAM to solve the quadratic model. I suggest you start with the linear mesh and see if you need the quadratic mesh.

[swathipharmacoo]

 

 

Hi, When i used Explicit method, linear element order, element size-0.002mm, i could not able to generate mesh. and i reduced element size to 0.00002mm it showed error. Here iam attaching images. Please look in to this.

 

[swathipharmacoo]

[peteroznewman]

I had success in the latest version, ANSYS 2025 R1.

What version of ANSYS are you using?

[swathipharmacoo]

2024R1

[peteroznewman]

ANSYS software developers improve the code in each release, so either the virtual topology and/or meshing code changed and can now succeed where two versions ago, it failed.

I don't have access to 2024 R1. I suggest you upgrade to the latest version.

[swathipharmacoo]

Thank you for the suggestion.

 

[oh737287]

The primary distinction between the mechanical and explicit physics preferences is that the mechanical solver can utilise either linear or quadratic elements, whilst the explicit solver is required to use linear element order. The size and shape of the elements are the other area where explicit and mechanical meshing choices diverge.  

https://drive.google.com/file/d/1QWwHc43E-yl4IjnjPSxAnBbsqH-YovYb/view?usp=sharing-Block Blast