一个棘手的问题

adass

*** ERROR ***
Another ANSYS job with the same job name (file) is already running in this directory or the file.lock file has not been deleted from an abnormally terminated ANSYS run. To disable this check, set the ANSYS_LOCK environment variable to OFF.

请问怎样才操作将 ANSYS_LOCK环境变量置为OFF，我的目的就是每次运行的结果输出到同一个文件中，当前运行的输出结果覆盖掉上次运行的输出结果。系统环境变量中没有这个变量名，比较郁闷？？？

请各位高手给予指导，小弟感激不尽！！！