Please, could you give me some suggestions on how to solve this problem?
I am trying to simulate cavitation in a 2D venturi tube (in ANSYS FLUENT), however when I go from the meshing stage to the configuration stage, the console shows me the following message: "WARNING: 10000 cells with non-positive volume detected." I ignored this message and continued working, but when I try to initialize, the console shows me an error message and does not allow me to simulate.
I am attaching images of the errors that Ansys Fluent shows me, as well as my generated mesh. It should be noted that I tried to do the same job under the same boundary conditions in a 3D venturi tube and Ansys does not show me such an error. I tried to mesh with a tetra mesh, but the result is the same. In addition to that, I would like to comment that my mesh is hexa, conformal and with a minimum orthogonal quality of 0.94.
It has been years since I have used the grid generation tools for FLUENT. (Used to be called GAMBIT, might still be called GAMBIT) but I will take a stab at this.
The volumes in the mesh are not only defined by points but each segment has a direction around a closed loop. If the direction of one of your loops is opposite the others, the resulting grid volumes will be negative.
Render your grid for volumes, you should be able to see which volumes are negative. Then look at the segments that create the geometry that defines the affected volumes. One or more of those segments is going backwards.
I understand, thank you very much for your answer.
To solve the problem of cells with negative volumes I had to generate the two-dimensional geometry again, so that it would not have negative cells in the Y coordinate. However, the floating point exception error message persists.
Glad you were able to solve the negative volume issue. To fix the Float Point Exception, I would need to sit down at the console and poke around a bit. As I noted, it has been a number of years.
Looks like you are using a Student License. Is there a ANSYS/FLUENT users forum you could query? Might be more productive than broadcasting a software specific question on RG.
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