want to know meaning
 

In post processing while loading the scalar data wt is the meaning of

Mass flux F1, Mass flux F2, Mass flux F3, Mass flux F4, Mass flux F5, Mass flux F6

what is meaning of F1, F2,F3,F4,F5,F6

F1 means + ve x direction mass flux.... F2 means - ve x direction mass flux

Is it right.... please give detail infomation @ it.