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Author Topic: STOP: Numerical Instability (CHID: namefile)  (Read 1477 times)


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STOP: Numerical Instability (CHID: namefile)
« on: December 14, 2018, 07:48:44 am »

Smokeview did not finish the simulation. He gave the following error:

STOP: Numerical Instability (CHID: namefile)

What does it mean?

Jon Albrecht

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Re: STOP: Numerical Instability (CHID: namefile)
« Reply #1 on: December 14, 2018, 10:36:20 am »

It means that the FDS solver was unable to arrive at a solution to the problem you provided it. Without seeing your model, it is impossible to know the problem. PyroSim simplifies the use of FDS, but it does not absolve the user of responsibility for not understanding the underlying solver. I encourage you to spend some time reading through both the FDS User's Guide, and the FDS Technical Reference. If you are not at all familiar with the solver, it is also worth noting that Thunderhead Engineering hosts trainings on PyroSim and FDS for those who prefer an instructor to guide their learning process. You can send an email to for guidance on your problem.


Jon Albrecht
Thunderhead Engineering