工程流体力学分析,ansys
4.3 Differential Equation of Mass ConservationX inlet (mass flow)y ( u) dx]dydz x
udydz u mass flux per unit areaX outlet udydz
dy
[ u
x
( u) dz [ u dx]dydz z x dx ( u) X flow out dxdydz Infinitesimal fixed CV x ( v) ( w) dxdydz In the like manner dxdydz y z Flow out off the CV ( V )dxdydz6