July 2, 2021 at 12:23 pmaitor.amatriainSubscriber
I am simulating an axisymmetric problem. I have defined an iso-surface of interest,July 2, 2021 at 3:15 pmRobAnsys EmployeeIn 2d we assume the domain is 1m thick (I advise against changing the reference depth) and in 2d-axi it's either PI or 2PI, but I can never remember which. As your surface is at different radial positions I'd check which it is using one of the other boundaries.
July 5, 2021 at 7:07 amaitor.amatriainSubscriberHello Rob Thank you for your answer. I understand that the area of the surface is computed by means of the usual formula for revolution surface, but I still have a doubt in terms of the area of the cells.
In a 3D mesh, all cells in contact with a surface have a well defined area. However, in a 2D mesh and an additional assumption has to be done. How is the area of the cells in contact with the revolution surface computed? ANSYS Fluent considers that each of the cells covers all angles from 0 to 2*pi?
Thank you Aitor
July 5, 2021 at 9:07 amRobAnsys EmployeeAs you suspect we assume each cell is PI or 2PI radians (if you find the documentation post the link in here for future reference), so represents an annular volume. Remember your cell has a volume, and the surface (boundary) area is that of the sector. So the area may be PI r^2 (assuming it's circular) or PI d length in the event it's an annular surface.
July 5, 2021 at 11:20 amaitor.amatriainSubscriberThank you As far as I am concerned, this issue related to the cell area and volume in 2D axisymmetric problems affects to all the Chapter 30
Chapter 30: Reporting Alphanumeric Data (ansys.com)
It would be interesting for other users to include a warning/note mentioning that cells are assumed to cover all the circumference.
July 5, 2021 at 12:47 pmRobAnsys EmployeeLike this one? https://ansyshelp.ansys.com/account/Secured?returnurl=/Views/Secured/corp/v211/en/flu_ug/flu_ug_sec_report_conventions.html I knew it was somewhere!
July 6, 2021 at 6:42 amaitor.amatriainSubscriberYes! Thank you!
July 6, 2021 at 9:24 amDrAmineAnsys EmployeeWelcome!
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