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Fail to converge when solving with a fabricated solution 

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March 22, 2021, 07:33 
Fail to converge when solving with a fabricated solution

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zizhou huang
Join Date: Jul 2019
Posts: 18
Rep Power: 5 
Hi,
I got "Divergence detected in AMG solver" when trying to solve with the exact solution on the domain as follows, it's from paper http://tarjomefa.com/wpcontent/uplo...TarjomeFa.pdf. where Here's the log. Code:
Updating solution at time levels N and N1. done. iter continuity xvelocity yvelocity zvelocity time/iter Stabilizing xmomentum to enhance linear solver robustness. Stabilizing xmomentum using GMRES to enhance linear Error at Node 1: floating point exception Error at Node 0: floating point exception Error at Node 2: floating point exception Error at Node 3: floating point exception Stabilizing xmomentum to enhance linear solver robustness. Stabilizing xmomentum using GMRES to enhance linear solver robustness. Divergence detected in AMG solver: xmomentum Stabilizing ymomentum to enhance linear solver robustness. Stabilizing ymomentum using GMRES to enhance linear solver robustness. Divergence detected in AMG solver: ymomentum Stabilizing zmomentum to enhance linear solver robustness. Stabilizing zmomentum using GMRES to enhance linear solver robustness. Divergence detected in AMG solver: zmomentum Stabilizing xmomentum to enhance linear solver robustness. Stabilizing xmomentum using GMRES to enhance linear solver robustness. Divergence detected in AMG solver: xmomentum Stabilizing ymomentum to enhance linear solver robustness. Stabilizing ymomentum using GMRES to enhance linear solver robustness. Divergence detected in AMG solver: ymomentum Stabilizing zmomentum to enhance linear solver robustness. Stabilizing zmomentum using GMRES to enhance linear solver robustness. Divergence detected in AMG solver: zmomentum Stabilizing xmomentum to enhance linear solver robustness. Stabilizing xmomentum using GMRES to enhance linear solver robustness. Divergence detected in AMG solver: xmomentum Stabilizing ymomentum to enhance linear solver robustness. Stabilizing ymomentum using GMRES to enhance linear solver robustness. Divergence detected in AMG solver: ymomentum Stabilizing zmomentum to enhance linear solver robustness. Stabilizing zmomentum using GMRES to enhance linear solver robustness. Divergence detected in AMG solver: zmomentum Stabilizing xmomentum to enhance linear solver robustness. Stabilizing xmomentum using GMRES to enhance linear solver robustness. Divergence detected in AMG solver: xmomentum Stabilizing ymomentum to enhance linear solver robustness. Stabilizing ymomentum using GMRES to enhance linear solver robustness. Divergence detected in AMG solver: ymomentum Stabilizing zmomentum to enhance linear solver robustness. Stabilizing zmomentum using GMRES to enhance linear solver robustness. Divergence detected in AMG solver: zmomentum Stabilizing xmomentum to enhance linear solver robustness. Stabilizing xmomentum using GMRES to enhance linear solver robustness. Divergence detected in AMG solver: xmomentum Stabilizing ymomentum to enhance linear solver robustness. Stabilizing ymomentum using GMRES to enhance linear solver robustness. Divergence detected in AMG solver: ymomentum Stabilizing zmomentum to enhance linear solver robustness. Stabilizing zmomentum using GMRES to enhance linear solver robustness. Divergence detected in AMG solver: zmomentum Stabilizing pressure correction to enhance linear solver robustness. Stabilizing pressure correction using GMRES to enhance linear solver robustness. Divergence detected in AMG solver: pressure correction Stabilizing pressure correction to enhance linear solver robustness. Stabilizing pressure correction using GMRES to enhance linear solver robustness. Divergence detected in AMG solver: pressure correction Stabilizing pressure correction to enhance linear solver robustness. Stabilizing pressure correction using GMRES to enhance linear solver robustness. Divergence detected in AMG solver: pressure correction Stabilizing pressure correction to enhance linear solver robustness. Stabilizing pressure correction using GMRES to enhance linear solver robustness. Divergence detected in AMG solver: pressure correction Stabilizing pressure correction to enhance linear solver robustness. Stabilizing pressure correction using GMRES to enhance linear solver robustness. Divergence detected in AMG solver: pressure correction Stabilizing pressure correction to enhance linear solver robustness. Stabilizing pressure correction using GMRES to enhance linear solver robustness. Divergence detected in AMG solver: pressure correction Stabilizing pressure correction to enhance linear solver robustness. Stabilizing pressure correction using GMRES to enhance linear solver robustness. Divergence detected in AMG solver: pressure correction Stabilizing pressure correction to enhance linear solver robustness. Stabilizing pressure correction using GMRES to enhance linear solver robustness. Divergence detected in AMG solver: pressure correction Stabilizing pressure correction to enhance linear solver robustness. Stabilizing pressure correction using GMRES to enhance linear solver robustness. Divergence detected in AMG solver: pressure correction Stabilizing pressure correction to enhance linear solver robustness. Stabilizing pressure correction using GMRES to enhance linear solver robustness. Divergence detected in AMG solver: pressure correction Stabilizing pressure correction to enhance linear solver robustness. Stabilizing pressure correction using GMRES to enhance linear solver robustness. Divergence detected in AMG solver: pressure correction Stabilizing pressure correction to enhance linear solver robustness. Stabilizing pressure correction using GMRES to enhance linear solver robustness. Divergence detected in AMG solver: pressure correction Stabilizing pressure correction to enhance linear solver robustness. Stabilizing pressure correction using GMRES to enhance linear solver robustness. Divergence detected in AMG solver: pressure correction Stabilizing pressure correction to enhance linear solver robustness. Stabilizing pressure correction using GMRES to enhance linear solver robustness. Divergence detected in AMG solver: pressure correction Stabilizing pressure correction to enhance linear solver robustness. Stabilizing pressure correction using GMRES to enhance linear solver robustness. Divergence detected in AMG solver: pressure correction Stabilizing pressure correction to enhance linear solver robustness. Stabilizing pressure correction using GMRES to enhance linear solver robustness. Divergence detected in AMG solver: pressure correction Stabilizing pressure correction to enhance linear solver robustness. Stabilizing pressure correction using GMRES to enhance linear solver robustness. Divergence detected in AMG solver: pressure correction Stabilizing pressure correction to enhance linear solver robustness. Stabilizing pressure correction using GMRES to enhance linear solver robustness. Divergence detected in AMG solver: pressure correction Stabilizing pressure correction to enhance linear solver robustness. Stabilizing pressure correction using GMRES to enhance linear solver robustness. Divergence detected in AMG solver: pressure correction Stabilizing pressure correction to enhance linear solver robustness. Stabilizing pressure correction using GMRES to enhance linear solver robustness. Divergence detected in AMG solver: pressure correction Stabilizing pressure correction to enhance linear solver robustness. Stabilizing pressure correction using GMRES to enhance linear solver robustness. Divergence detected in AMG solver: pressure correction Stabilizing pressure correction to enhance linear solver robustness. Stabilizing pressure correction using GMRES to enhance linear solver robustness. Divergence detected in AMG solver: pressure correction Divergence detected in AMG solver: xmomentum Divergence detected in AMG solver: ymomentum Divergence detected in AMG solver: zmomentum Divergence detected in AMG solver: xmomentum Divergence detected in AMG solver: ymomentum Divergence detected in AMG solver: zmomentum Divergence detected in AMG solver: xmomentum Divergence detected in AMG solver: ymomentum Divergence detected in AMG solver: zmomentum Divergence detected in AMG solver: xmomentum Divergence detected in AMG solver: ymomentum Divergence detected in AMG solver: zmomentum Divergence detected in AMG solver: xmomentum Divergence detected in AMG solver: ymomentum Divergence detected in AMG solver: zmomentum Divergence detected in AMG solver: pressure correction Divergence detected in AMG solver: pressure correction Divergence detected in AMG solver: pressure correction Divergence detected in AMG solver: pressure correction Divergence detected in AMG solver: pressure correction Divergence detected in AMG solver: pressure correction Divergence detected in AMG solver: pressure correction Divergence detected in AMG solver: pressure correction Divergence detected in AMG solver: pressure correction Divergence detected in AMG solver: pressure correction Divergence detected in AMG solver: pressure correction Divergence detected in AMG solver: pressure correction Divergence detected in AMG solver: pressure correction Divergence detected in AMG solver: pressure correction Divergence detected in AMG solver: pressure correction Divergence detected in AMG solver: pressure correction Divergence detected in AMG solver: pressure correction Divergence detected in AMG solver: pressure correction Divergence detected in AMG solver: pressure correction Divergence detected in AMG solver: pressure correction Divergence detected in AMG solver: pressure correction Divergence detected in AMG solver: pressure correction Divergence detected in AMG solver: xmomentum Divergence detected in AMG solver: ymomentum Divergence detected in AMG solver: zmomentum Divergence detected in AMG solver: xmomentum Divergence detected in AMG solver: ymomentum Divergence detected in AMG solver: zmomentum Divergence detected in AMG solver: xmomentum Divergence detected in AMG solver: ymomentum Divergence detected in AMG solver: zmomentum Divergence detected in AMG solver: xmomentum Divergence detected in AMG solver: ymomentum Divergence detected in AMG solver: zmomentum Divergence detected in AMG solver: xmomentum Divergence detected in AMG solver: ymomentum Divergence detected in AMG solver: zmomentum Divergence detected in AMG solver: pressure correction Divergence detected in AMG solver: pressure correction Divergence detected in AMG solver: pressure correction Divergence detected in AMG solver: pressure correction Divergence detected in AMG solver: pressure correction Divergence detected in AMG solver: pressure correction Divergence detected in AMG solver: pressure correction Divergence detected in AMG solver: pressure correction Divergence detected in AMG solver: pressure correction Divergence detected in AMG solver: pressure correction Divergence detected in AMG solver: pressure correction Divergence detected in AMG solver: pressure correction Divergence detected in AMG solver: pressure correction Divergence detected in AMG solver: pressure correction Divergence detected in AMG solver: pressure correction Divergence detected in AMG solver: pressure correction Divergence detected in AMG solver: pressure correction Divergence detected in AMG solver: pressure correction Divergence detected in AMG solver: pressure correction Divergence detected in AMG solver: pressure correction Divergence detected in AMG solver: pressure correction Divergence detected in AMG solver: pressure correction Divergence detected in AMG solver: xmomentum Divergence detected in AMG solver: ymomentum Divergence detected in AMG solver: zmomentum Divergence detected in AMG solver: xmomentum Divergence detected in AMG solver: ymomentum Divergence detected in AMG solver: zmomentum Divergence detected in AMG solver: xmomentum Divergence detected in AMG solver: ymomentum Divergence detected in AMG solver: zmomentum Divergence detected in AMG solver: xmomentum Divergence detected in AMG solver: ymomentum Divergence detected in AMG solver: zmomentum Divergence detected in AMG solver: xmomentum Divergence detected in AMG solver: ymomentum Divergence detected in AMG solver: zmomentum Divergence detected in AMG solver: pressure correction Divergence detected in AMG solver: pressure correction Divergence detected in AMG solver: pressure correction Divergence detected in AMG solver: pressure correction Divergence detected in AMG solver: pressure correction Divergence detected in AMG solver: pressure correction Divergence detected in AMG solver: pressure correction Divergence detected in AMG solver: pressure correction Divergence detected in AMG solver: pressure correction Divergence detected in AMG solver: pressure correction Divergence detected in AMG solver: pressure correction Divergence detected in AMG solver: pressure correction Divergence detected in AMG solver: pressure correction Divergence detected in AMG solver: pressure correction Divergence detected in AMG solver: pressure correction Divergence detected in AMG solver: pressure correction Divergence detected in AMG solver: pressure correction Divergence detected in AMG solver: pressure correction Divergence detected in AMG solver: pressure correction Divergence detected in AMG solver: pressure correction Divergence detected in AMG solver: pressure correction Divergence detected in AMG solver: pressure correction I also tried with the taylor green vortex solution (as shown below) with the same settings, and it works. However, I really want to try something nontrivial in the third dimension. I'm wondering whether it's because fluent cannot solve with this solution? Or did I make any mistake? Thanks a lot! 

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