急！！！PDF模型中组分的质量分数怎么求啊？

LGLQ

如题。。论坛中有前辈说C_YI(c,t,i)不能用在PDF模型中，会出现如下错误：
Error:
FLUENT received fatal signal (ACCESS_VIOLATION)
1. Note exact events leading to error.
2. Save case/data under new name.
3. Exit program and restart to continue.
4. Report error to your distributor.
Error Object: ()

请教各位。。。