Learning Forum

[sadhurajesh]

1.geometry

[Keyur Kanade]

Please check following videos

Ansys Meshing: Decomposition for hex meshing:
https://www.youtube.com/watch?v=P19GOTQWmc0

Ansys Meshing: Meshing Methods:
https://www.youtube.com/watch?v=nEOC8rDnnRo

First check the locations of the bad elements. Please see following video for the same.

https://www.youtube.com/watch?v=ZDADSSN8hOs

Once you have locations, please check if you can improve mesh using different mesh sizing. Please see following video.

https://www.youtube.com/watch?v=w4q6q8nKF3U

If this does not help, you may need to check if you can use pinch control or virtual topology.

https://www.youtube.com/watch?v=wdKMqfJV1Ys
https://www.youtube.com/watch?v=RELLrEJ9chg

If this does not help, please go to geometry and modify or simplify geometry at those locations in SpaceClaim.
Regards Keyur
How to access Ansys Online Help Document
Guidelines on the Student Community

[sadhurajesh]

how to rectify this error

[Keyur Kanade]

Are you using multizone.
Please check tutorials on multizone. It would be better to split the geometry.

Ansys Meshing: Decomposition for hex meshing:
https://www.youtube.com/watch?v=P19GOTQWmc0

Ansys Meshing: Meshing Methods:
https://www.youtube.com/watch?v=nEOC8rDnnRo
Regards Keyur
How to access Ansys Online Help Document
Guidelines on the Student Community

[sadhurajesh]

how to split the geometry?

[Rob]

I tend to favour the Split command: have a look at the geometry tutorials.

[sadhurajesh]

where to where we have to split the body to get hex meshing

[Rob]

If you want a hex mesh you'll either need logical cubes (not something I'd try) or sweep. Personally, I'd be looking at Fluent Meshing and just poly the whole thing. How are you getting on with the tutorials?

[sadhurajesh]

Ansys Meshing: Decomposition for hex meshing:
https://www.youtube.com/watch?v=P19GOTQWmc0 I am unable to understand

[Rob]

Which bit?

[sadhurajesh]

after slicing
mesh
How to improve the mesh? while solving i am getting floating point exception

[Rob]

I'm assuming you checked the cell skew? What is causing the blocks to distort like that?

[sadhurajesh]

skewness - min 1.3057e-010, avg 6.0265e-002, max 0.97917
aspect ratio- min1.0002, max 82.067
orthogonal quality- min 2.0831e-002, max 1, avg 0.94992
element quality- min 3.6629e-003, max 1, avg 0.72873
these are the mesh quaities. how to improve skewness

[Rob]

By understanding why the skew cells are created: why are they getting squashed in the image?

[sadhurajesh]

after meshing they squashed

[Rob]

Look carefully, and use cut planes (show full cells) to see what's going on. Please post those images so I can see what's going on.

[sadhurajesh]

1

[sadhurajesh]

[Rob]

Click on the blue tetrahedron in the cut plane panel, that shows the full cells. However, I think your problem is that you've meshed the thickness of the baffles: the jump in cell size is then huge which isn't going to result in a stable run. You also want at least 6 cells between the plates to get anywhere near sufficient resolution to pick up the velocity profile.