Learning Forum

[HaniCFD]

Hello, I have been trying to run a simulation for a turbine driven by an inlet-velocity flow. A fully triangular mesh has been used for the entire geometry with dynamic mesh properties. The turbine runs on 6DOF rotation active while the inner mesh is passive.

However, every time I run the calculations, the solution starts diverging after the third timestep until I get the warning: negative cell volumes have been detected. I have tried all the solutions provided in other forum threads that include reducing the timestep duration yet I am still experiencing the issue with 1e-06 time step.

Could I get your help on how to fix this issue? You can find the mesh attached to thread.

[Karthik Remella]

Hello Have you identified where you are detecting the negative cell volume? You could create a Field Variable Register in Fluent using the Field Value - Cell Volume. If you have negative cells, should be able to display all the cells with a volume less than 0. This should help you identify the region. To access this - Domain -> Adapt -> Automatic -> Cell Registers -> New
Also, what are your Dynamic meshing setting? Are you using the Remeshing option?
Karthik