解算时出现不明错误?不知是何原因?

解算时出现不明错误?不知是何原因?

Internal error in write_case_one_group: fan "fan.4" --
domain error: argument not in valid range
domain error: argument not in valid range
    while executing
"expr ($y - $yn1) / ($x - $prev_x)"
    (procedure "get_fan_curve" line 38)
    invoked from within
"get_fan_curve $obj $cspec $area $dens $vratio"
    (procedure "obsolve_uns_fan" line 440)
    invoked from within
"$func $obj $map $sh $side $nof"
    (procedure "write_case_obsolve" line 7)
    invoked from within
"write_case_obsolve $func $obj $map $sh $side $nof"
Internal error in write_case_one_group: fan "fan.3" --
domain error: argument not in valid range
domain error: argument not in valid range
    while executing
"expr ($y - $yn1) / ($x - $prev_x)"
    (procedure "get_fan_curve" line 38)
    invoked from within
"get_fan_curve $obj $cspec $area $dens $vratio"
    (procedure "obsolve_uns_fan" line 440)
    invoked from within
"$func $obj $map $sh $side $nof"
    (procedure "write_case_obsolve" line 7)
    invoked from within
"write_case_obsolve $func $obj $map $sh $side $nof"
Writing fluent/uns input to F:/20170122/20170122_files/dp0/IPK-11/Icepak/IcepakProj/IcepakProj00.cas
Not starting solver - case file has errors.

一般是网格问题