Learning Forum

[atulsingh92]

Hello,

I Have a periodic unit of a tube. A small surface groove on the circumference of one pitch. Blends to smooth the edge due to the groove.

This makes a very sharp edge at the inlet and outlet sections (seen in orangish patch ), which are turning out to be difficult to mesh without stair-stepping.

I have tried reducing the gap factor to 0.1 and 0.2, which didn't proove much help.

Also tried, combining the blue and golden region to combine them as one wall and then generete boundary layer, which also didn't help.

And then have tried chaning min max global size controls, which also didn't gave a stable/high quality mesh as well.

Could I request some pointers on resolving this?

[Keyur Kanade]

Stair stepping is happening due to sharp angle. Please check if you can remove that sharp angle to modify geometry.
Changing gap factor etc. may give you mesh but quality may not be good. So best option is to modify geometry.
Please go through help manual for more details
Regards Keyur
How to access Ansys Online Help Document
Guidelines on the Student Community

[atulsingh92]

That wouldn't work, as I have to test various pitch of these surface grooves, so reducing this sharp angle means, increasing the pitch, which does belong to my larger design space, but that doesn't necessarily eliminate this design, only because the angle was too sharp.
Any other suggestions?

[Rob]

If you unite the annular surfaces it'll help. Also, if you extend the tube by around one cell height the change is unlikely to alter the result but will improve the mesh.