工程流体力学分析,ansys
It is not these stresses but their gradient, which cause a net force on the differential volume. Px Py Pz dV dxdydz Rdxdydz ( )dxdydz dt x y z dV 1 Pi R [ ] dt xi
Momentum equation
Px xxi xy j xz kIn the like manner Py yxi yy j yz k Pz zxi zy j zz k
xy
xz
xx
Px