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Biomass gasification model: floating point error

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Old   December 3, 2016, 15:18
Exclamation Biomass gasification model: floating point error
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Jamie Bell
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Hi everyone,

I'm relatively new to star-ccm+ and CFD in general so apologies if any of my issues seem trivial. As part of my final year project at uni I have to create a model on star-ccm+ to simulate the gasification process in a downdraft gasifier. I've created the model using lagrangian multiphase to model the reactions between the solid feedstock and gasification agent & volatiles.

Before using the point injector to inject the biomass, I've simulated pre-heated air flowing into the gasifier to heat up the gasifier in preparation for the gasification process. However, when I try to run it with the biomass injector activated I get the following error:

"A floating point exception has occurred: floating point exception [Invalid operation]. The specific cause cannot be identified."

Can anyone help me with this? Sorry if I am not being descriptive enough. I've used the eddy break-up combustion and mixing model, I've also defined all my reactions along with the reaction coefficients. I have 6 boundaries, 4 of which are air inlets defined as mass flow inlets, 1 of the boundaries represents the walls of the gasifier, and the last boundary represents the pressure outlet.

Any help would be greatly appreciated.
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combustion modeling, floating point error, floating point exception, gasification cfd, lagrangian phase

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