The "Divergence detected in AMG solver" error in ANSYS Fluent indicates that the Algebraic Multigrid (AMG) solver is struggling to converge. This can arise from several factors, including:
* Mesh quality: Ensure your mesh is well-defined, with good aspect ratios and minimal skewness. Consider refining the mesh, particularly in areas with high gradients or complex geometry.
* Under-relaxation factors (URFs): URFs control the rate at which solution values are updated between iterations. Excessive URFs can lead to divergence. Try reducing the URFs, especially for the temperature equation.
* Boundary conditions: Double-check that your boundary conditions are defined correctly and consistent with the physics of your problem. Inaccurate boundary conditions can lead to the solver struggling to find a solution.
* Solver settings: Experiment with different AMG solver settings, such as the coarsening scheme or relaxation method. You might also consider switching to a different solver, such as SIMPLE or PISO.
If you've already tried simplifying the problem and the error persists, consider sharing your mesh and boundary condition details on the CFD Online forum for more specific guidance from experienced users.
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