工程流体力学第四章2(13)

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

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