how to set BCs when u know p bcs but didn't know u bcs
 

hi guys
i have some problems in set bcs
in reference documents , they set inlet pressure bcs as total pressure and set outlet pressure as static pressure ,but they didn't give any information about how to set velocity bcs.
in openfoam ,i set my pressure bcs like the reference said ,but i want to know how to set my inlet and outlet velocity bcs