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maximum mole fraction and pre-defined inlet methane mole fraction

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Old   May 10, 2019, 21:09
Default maximum mole fraction and pre-defined inlet methane mole fraction
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Weiqiang Liu
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Hi all,

I am modelling methane catalytic combustion in micro-channel including both gas phase and surface mechanism. My current work is to reproduce literature results. However, the maximum temperature is always 200 k lower than literature results. I put the computed temperature contour below.

All residuals are below 1e-6 and keeps flat. I can not figure out why this happen. I checked the contour of methane mole fraction and found the calculated maximum methane mole fraction is 0.09. However, the inlet pre-defined methane mole fraction is 0.105. I believe these two values should be the same. I also guess this is the reason why my simulation temperature is 200K lower than literature results.

I am wondering how can I solve this problem. Is it because the case still not converged or something wrong with my model.

Please help.

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File Type: png mole fraction.png (12.5 KB, 3 views)
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inlet, maximum temperature, mole fraction

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