Divergence detected in AMG solver

  • Last Post 24 February 2019
gunjanauti posted this 23 February 2019

I am solving a multiphase model using VOF, with energy and viscous laminar flow active. I have developed UDFs of mass, momentum and energy source terms. The simulation runs quite nicely as expected for a few time steps but after that this error pops up.

What does this error exactly mean and where exactly is the problem? (It shows divergence for all the equations it is solving even if the residuals are not diverging).


Thank you



abenhadj posted this 24 February 2019

It does mean floating Error in the Algebraic Multigird Solver for the linearized equations. Error might have several reasons. Try at First without UDF or with smaller Time Scales.

Best regards,


  • Liked by
  • gunjanauti