Hello Antonio, how are you?

Usually, I get that error when the simulation diverges, so try to monitor the CFL to see if that is the case. If so, evaluate the possibility of reducing the time step.

However, that could be the option of something wrong with the setup or the combination of methods is not implemented. I'm suspicious about that because the error would be completely different, I guess so...

If you have solved the problem, please answer so it can be registered in the forum.

Att,

Daniel.

Em seg., 23 de dez. de 2024 às 21:36, ANTONIO MAZZARA <ant.mazzara@studenti.unina.it> escreveu:

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Dear all,

When I run a 2.5D simulation with a coordinate transformation and an extra passive scalar transport, I get the following error:

CG iterations made = 5001 using tolerance of 1e-09 (error = -nan, rhs_mag = 1)

Fatal : Level 0 assertion violation

Exceeded maximum number of iterations

However, if I repeat the simulation without the passive scalar transport, it proceeds correctly.

Has anyone else encountered the same problem? If so, would you be able to assist me in resolving it?

Thank you in advance for youe help,

Antonio.

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