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算了一个二维可压缩流的甲烷空气燃烧的模拟,预混合的,采用EDC模型单步反应,k-w双方程模型标准壁面函数,时间离散为显式,对流项是二阶迎风,通量是AUSM格式,其他的各项用二阶迎风格式,我patch了一个2000k的高温区域,但是不知道为什么一直点不着火,哪位大佬可以解答一下吗?模型是一个长方形2个长边和其中一个短边边界条件为wall,另外一个短边是压力出口。