Regarding the issue of the lack of fuel in the second porous region that you mentioned, the mass fraction contour of CH4 as shown in picture below indicates that the fuel concentration in the porous zone is similar to that in the combustion zone. Based on this observation, one would expect that since the contour of the mass fraction of fuel and CH4 is the same, there should be an adequate amount of fuel present in the porous zone. However, I'm unsure if my understanding of this is correct.
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