Steady-State Relative Differential Norm nan but solve converges well

[xu7875]

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Question

Hello MOOSE community,

I have a question on detecting steady state.

I got a report "Steady-State Relative Differential Norm: -nan" from my solve. However, my solve converges well.

After several time steps, my nonlinear residual already drops below my set tolerance, which means the my system does not evolve anymore. However, Steady-State Relative Differential Norm: -nan.

My question is how come such on one hand, it converges, on the other hand, Steady-State Relative Differential Norm: -nan?

Thank you,

Jiangang

[xu7875]

I have figured it out.
I haved turned on check_aux = true however there is no auxvariable or auxkernel in my input file.
Thank you.