Weiqiang Liu
hello, Rob and Federico,nThanks very much for your suggestions! My geometry is extremely simple which makes the quality of mesh very good. The geometry is just a straight channel and I tried to checked the quality in fluent or ICEM. They always give me perfect quality report. Therefore, I guess maybe it's the problem of chemical mechanism. Because I heared about some other people say that mechanisms matter in combustion simulation with fluent.nBest regardsnweiqiangn