说明：  2维实现木材燃烧的CFD模拟，其中木材的热解挥发释放到气相的源相通过UDF源相来实现。焦炭燃烧过程的也通过源相来实现
(Two-dimensional CFD simulation of wood burning, in which the pyrolysis of wood is released into the gas phase is achieved by the UDF source phase. The coke combustion process is also realized by the source phase.)