楼主注意看帮助:
MP
HF: Convection or film coefficient
SF
CONV VALUE is typically the film coefficient and VALUE2 (below) is typically the bulk temperature. If VALUE = -N, the film coefficient may be a function of temperature and is determined from the HF property table for material N [MP]. The temperature used to evaluate the film coefficient is usually the average between the bulk and wall temperatures, but may be user-defined for some elements. l
因此可以看出:
(1)hf是材料的对流或模系数,而Conv的值一般是膜(或对流)系数的值,若值为-N,则选取材料的HF值,这是原文帮助的意思,说白了,CONV的值可以是材料的对流或模系数,也可以是其它数值;
(2)理论上讲,一般地两个值是有关系,即Hf应该等于CONV,但也有特殊情况,此时两者有可能有差异,因此,设定两个量定义,以使程序更加灵活;