October 6, 2022 at 4:53 am
October 6, 2022 at 8:29 amRobAnsys Employee
Are those planes/iso surfaces that you're monitoring? How does the mass flux look on inlet & outlet?
October 7, 2022 at 8:13 amOhiroSubscriber
Hi Rob, inlet is 1.9755497e-05, and outlet is -1.9755497e-05.
Inlet should be the same surface with delta_y=0.06 and outlet should be with delta_y=0, but the values are not equivalent to those in the second image.
October 7, 2022 at 9:30 amRobAnsys Employee
OK, and you're using a plane or isosurface for those other faces?
October 11, 2022 at 12:47 amOhiroSubscriber
Right, all 7 faces normal to the y-axis are isosurfaces. They are named delta_y=0, delta_y=0.01,... from the right side of the picture.
October 17, 2022 at 8:18 amRobAnsys Employee
OK. Iso surfaces & planes use interpolated data, ie they interpolate from the nearest cell centres and then integrate/average/whatever. As a result they'll always be marginally less accurate than a defined surface from the mesh (interior, inlet, wall etc) which stores data on the facets. Assuming y=0 & y=0.06 are on the flow boundaries the interpolation may be a little worse than surfaces inside the domain as there's less data available.
October 18, 2022 at 1:27 amOhiroSubscriber
So, if there is a plane I want to see the flow rate (or other physical quantities) on the inside, should I make a defined surface by cutting the body so that the face is boundary?
October 18, 2022 at 9:52 amRobAnsys Employee
If you need exact values yes, split in geometry or (whole cells only) you can split the mesh in Fluent. In most cases the difference is negligable, so you may need to check mesh resolution.
October 20, 2022 at 8:51 amOhiroSubscriber
OK. Thank you so much for your answer, Rob!
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