Learning Forum

[z.alinca]

Hello, 

I am doing static analysis right now and I've realized that the strain results are different when I use sphere of influence instead of body of influence. I've used same element size for both. I am not sure which one is more accurate and I dont know why there is a difference between them. Could you please help me to understand? 

Thanks a lot,

[Kaushal Vadnere]

Hello,

The difference in strain results between Sphere of Influence and Body of Influence mesh sizing is due to how each method controls mesh density and element distribution:

Sphere of Influence applies a strict element size in the defined spherical region (hard setting), leading to abrupt mesh transitions and more localized refinement. This can capture local strain gradients better but may introduce numerical artifacts.
Body of Influence sets a local maximum element size within a defined (often non-spherical) region (soft setting), resulting in smoother mesh transitions. It’s better for global accuracy but may not resolve highly localized phenomena as well.
Neither method is universally more accurate; the choice depends on your geometry and analysis needs. For strict control in spherical regions, use Sphere of Influence. For smoother transitions in broader or non-spherical regions, use Body of Influence.
Always check mesh quality and perform convergence studies to ensure reliable strain results.

For more details, refer to this article on Local sizing controls in Ansys Help documentation: https://ansyshelp.ansys.com/public/account/secured?returnurl=/Views/Secured/corp/v251/en/wb_msh/wb_msh_q1d_zhp_1w.html

 

Regards,
Kaushal

[ErKo]

Hi Zehran

 

We have got your request (Ansys structural meshing methods) for support in our ACSS portal and will help you there instead (we can look at models there but not here).

 

All the best

Erko