An overflow error in Ansys Fluent can occur when the solver encounters a numerical instability or a divergence in the solution. This can be caused by various factors, such as:
- Inappropriate boundary conditions or initial conditions
- Poor mesh quality or resolution
- Incorrect physical models or parameters
- Large time steps or under-relaxation factors
- Round-off errors or machine precision limitations
To avoid overflow errors, you can try some of the following suggestions:
- Check your geometry and mesh for any errors or defects. You can use the Fault Detection tool in Design Modeler² or the Mesh Check tool in Fluent¹ to identify and fix any problems.
- Refine your mesh to capture the important features and regions of your domain. You can use the Proximity and Curvature meshing option in ANSYS Mesher² to generate a high-quality mesh that adapts to the geometry shape.
- Initialize your solution with reasonable values that are close to the expected solution. You can use the Hybrid Initialization option in Fluent to initialize the flow variables based on the boundary conditions.
- Choose the appropriate physical models and parameters for your problem. You can consult the Fluent User's Guide or the Fluent Theory Guide for guidance on selecting the best models for your case.
- Reduce your time step size or your under-relaxation factors to improve the stability and convergence of your solution. You can use the Courant Number option in Fluent to automatically adjust the time step based on the local flow velocity and mesh size.
- Increase the solver precision or switch to double precision to reduce the round-off errors and increase the accuracy of your solution. You can change the solver precision in the Solver Settings panel in Fluent.
I hope these tips help you avoid overflow errors in Ansys Fluent. If you have any further questions, please feel free to ask me. 😊
Source:
(1) ANSYS Fluent - Tips, Tricks, and Troubleshooting – Nimbix. https://support.nimbix.net/hc/en-us/articles/360044738671-ANSYS-Fluent-Tips-Tricks-and-Troubleshooting.
(2) Overflow error - Ansys Learning Forum. https://forum.ansys.com/forums/topic/overflow-error/.
(3) Floating Point Exception (Core Dumped): How To Fix This Error. https://www.positioniseverything.net/floating-point-exception-core-dumped/.
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