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【正文】 OABCDB 39。Eqs. (45) , p. 69 2222xuxpxupxxp xxxx???????????????????????? ??Fluid Mechanics 2022 CN Chapter 4 20 2. The NavierStokes Equations (6) 4. Inpressible Ideal Fluid Flow )1()()()(????????????????????????????????xuzuzuyuyuxuzxxzzxyzzyyzxyyxxy?????????The shear stress is related to the shear velocity and the dynamic viscosity. Furthermore, some shear stresses are equal. Eqs. (46) , p. 69 dtduzyxp xzxyxxx ??????????????????? ???1XForce equilibrium of a differential fluid particle in the xdirection : ???????????????????????????????????222yuxyuyuxuyyxyxyyx ????????????????????????????????????xzuzuxuzuzzzxzxzx222???Fluid Mechanics 2022 CN Chapter 4 21 2. The NavierStokes Equations (7) 4. Inpressible Ideal Fluid Flow Force equilibrium of a differential fluid particle in the xdirection : dtduxzuzuyuxyuxuxpX xzxxyx ??????????????????????????????????????? 2222222221 ??????????????????????222yuxyuyxyyx ????????????????????xzuzuzzxzx222??dtduzyxpdtduzyxpxzxyxxxxzxyxxx?????????????????????????????????????????????11X1X222xuxpxp xxx?????????? ?Fluid Mechanics 2022 CN Chapter 4 22 2. The NavierStokes Equations (8) 4. Inpressible Ideal Fluid Flow Force equilibrium of a differential fluid particle in the xdirection : dtduxzuzuyuxyuxuxpX xzxxyx ??????????????????????????????????????? 2222222221 ????dtduxuxzuxyuzuyuxuxpX xxzyxxx ????????????????????????????????????????22222222221?????dtduxuzuyuxzuyuxuxpX xxzyxxx ????????????????????????????????????????????? 2222221dtduxzuzuyuxyuxuxpX xzxxyx ??????????????????????????????? 2222222221 ?????dtduxzuxyuxuzuyuxuxpX xzyxxxx ????????????????????????????????????????? 22222222221???????Fluid Mechanics 2022 CN Chapter 4 23 2. The NavierStokes Equations (9) 4. Inpressible
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