FDS故意设置火灾的随机性: FDS initializes the flow field with a very small amount of “noise” to prevent the development of a perfectlysymmetric flow when the boundary and initial conditions are perfectly symmetric. To turn this off, setNOISE=F To control the amount of noise, set NOISE_VELOCITY. Its default value is 0.005 m/s. 即便你的网格尺寸不变,两次计算的结果也不一样。