how does paraview show U_magnitude plot ??
 

Hi,
i am new to Openfoam, if suppose i give velocity in both x and y direction, after the simulation is done . I have noticed in paraview , variables of plot over line has U_magnitude along with Ux,Uy and Uz , how does openFoam calculate U_magnitude??

and is it possible to obtain U_magnitude by using other post-processing methods like singleGraph, if so can u plz tell me how ?