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Lagrangian Description of Three-Dimensional Viscous Flows at Large Reynolds Numbers

机译:拉格朗日在大型雷诺数的三维粘性流的描述

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Boundary layer theory is used to show that, at large Reynolds numbers, the three-dimensional Navier-Stokes equations can be rewritten in a form with diffusion velocity that was previously known for the cases of two-dimensional and axisymmetric flows. Relying on this hypothesis, a closed system of equations that is a development of a similar model for the indicated special cases is derived to describe fluid flows in the Lagrangian approach. Simultaneously, a number of mathematical issues are investigated. The existence of an integral representation for the velocity field with integrals with respect to Lagrangian coordinates is proved by analyzing the equations of motion of selected Lagrangian particles and applying the theory of ordinary differential equations with parameters. An equation describing the vorticity flux from the body surface is derived.
机译:边界层理论用于表明,在大的雷诺数中,三维Navier-Stokes方程可以以先前已知的二维和轴对称流动的情况以先前已知的漫射速度重写。 依赖于该假设,封闭式的方程式,即衍生出用于指示特殊情况的类似模型的开发,以描述拉格朗日方法中的流体流动。 同时,调查了许多数学问题。 通过分析所选择的拉格朗日粒子的运动方程并利用参数应用常微分方程理论的方式,证明了具有相对于拉格朗日坐标的积分的速度场的整体表示。 推导了描述来自车身表面的涡流通量的等式。

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