CanteraError thrown by CVodesIntegrator::step: CVodes error encountered.

[Francesca]

Hi all,

I am conducting a ignition delay time simulation on 2-methyl-2-butene mechanism from Westbrook et al. (2015) as assignment.

I got the following error by running the simluation in a non ideal shock tube reactor. I'm not sure to what this problem is related as this is my first practice with cantera and with combustions. I saw other similar problems in this conversation, but I'm not sure I undesrtood how to fix mine. I appreciate if someone can help me out. Thank you in advance for your time and help.

OS: Windows 10

Interface: Python

Cantera version: 2.5.0

CanteraError: 

***********************************************************************

CanteraError thrown by CVodesIntegrator::step:

CVodes error encountered. Error code: -9

Exceptions caught during RHS evaluation:

***********************************************************************

CanteraError thrown by checkFinite:

ydot contains non-finite elements:

ydot[3] = -nan

ydot[4] = -nan

ydot[5] = -nan

ydot[7] = -nan

ydot[9] = -nan

ydot[14] = -nan

ydot[15] = -nan

ydot[17] = -nan

ydot[33] = -nan

ydot[34] = -nan

ydot[35] = -nan

ydot[37] = -nan

ydot[39] = -nan

ydot[40] = -nan

ydot[41] = -nan

ydot[72] = -nan

ydot[91] = -nan

ydot[93] = -nan

ydot[98] = -nan

ydot[122] = -nan

ydot[213] = -nan

ydot[367] = -nan

ydot[373] = -nan

***********************************************************************

The right-hand side routine failed at the first call.

Components with largest weighted error estimates:

623: -6.736079086516795e-295

613: -6.68175601045738e-295

603: -6.627432947350587e-295

593: -6.573109871291173e-295

583: -6.518786782279135e-295

573: -6.464463706220511e-295

563: -6.410140435886776e-295

553: -6.355817359826571e-295

543: -6.301494270816114e-295

533: -6.2471711947567e-295

***********************************************************************

[Bryan Weber]

Hi Francesca,

Can you please attach your script and input file? It is very hard to help without seeing the code. Thanks!

Bryan

[Federica Bortolo]

Yes, sorry I tried to do that on the first email but I got an error message. Here they are.

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[Bryan Weber]

Hi Francesca,

Thank you! Can you attach the circiri.cti file? Or is it the same as the mech.cti file you attached? I didn't see a R-K phase in that file.

Best,

Bryan

[Federica Bortolo]

Dear Bryan,

To solve the problem I converted the initial input and therm data with another way. Now I don't get any error message.

Thank you for your time and help.

Best regards.

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[Delight Ezeh]

Hi Federica 

Please what other way did you convert the initial input and therm data cos I am having similar errors too

*******************************************************************************

CanteraError thrown by checkFinite:
ydot contains non-finite elements:

ydot[2] = -nan*******************************************************************************

CanteraError thrown by checkFinite:
ydot contains non-finite elements:

ydot[2] = -nan

Quite very new to canterra despite having gone over the documentations, etc.