July 12, 2019 at 10:38 amDobaSubscriber
Geometry can be seen here - https://forum.ansys.com/forums/topic/some-of-the-residuals-increasing-sharply-after-20-or-so-iterations/
I am trying to follow this tutorial -
but it's not working out for my geometry. I am getting like 7 different errors at the same time.
July 12, 2019 at 12:44 pmRobAnsys Employee
I'd make sure share topology had been done and that the mesh controls were set for CFD-Fluent. Set a small minimum size & sensible larger size and tet the whole model. Ideally move to 2019R2 and use the new meshing workflow shown here
July 20, 2019 at 4:49 pmDobaSubscriber
I'm assuming you want me to use the Watertight Geometry meshing? I have a basic question about that. In the video it says that "Watertight refers to that models that don't require much cleanup". What does this mean exactly? How do I if my geometry requires much cleanup?
July 21, 2019 at 1:50 ampeteroznewmanSubscriber
If you want to study the airflow over a car body, and you were given all the panels, the underbody and the glass, there would be a large number of gaps. In years past, a lot of work would go into plugging all the gaps until the body was "watertight" then it could be subtracted from the air and meshing of the air could be done. Now ANSYS has some automation to drape a surface over the body and fill the gaps automatically.
Contrast that to a simple solid body representation of a pipe, with a flange face around the inlet and outlet. By simply identifying the two flanges, a watertight fluid cavity is easily identified. That requires no cleanup, it is considered "watertight" geometry.
July 21, 2019 at 10:44 am
July 22, 2019 at 11:18 amRobAnsys Employee
Now you've got the graph working zoom in on the poor quality cells. I suspect the decomposition you did to make the O-grid is giving some very small gaps/faces on the filter. If you merge all the fluid zones together and remesh how does it look? Note, keep zone separate if you need porous media.
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