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首页> 外文期刊>Bulletin of the American Physical Society >APS -70th Annual Meeting of the APS Division of Fluid Dynamics- Event - Vortex dipole as a mechanism of shedding for inviscid methods
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APS -70th Annual Meeting of the APS Division of Fluid Dynamics- Event - Vortex dipole as a mechanism of shedding for inviscid methods

机译：APS-流体动力学APS部门第70届年会-事件-涡流偶极子作为无粘性方法的脱落机制

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For a sharp edge of arbitrary interior angle it is shown that the physical mechanism of vortex shedding is the existence of a vortex dipole/doublet at the edge. This is obtained by applying the limit of a point vortex approaching the shedding edge while its circulation increases. Then the vortex merges with its image to create the dipole. In the case of a finite body (doubly-connected fluid region), such as an airfoil, this dipole establishes an equivalent bound circulation round the body. However, the complex potential is not actually constructed with a dipole at the trailing edge, but that this hypothetical potential determines the strength of an equivalent bound vortex that represents the effect of the formation of vorticity to be shed. The mechanism of vortex shedding can then be interpreted as a finite portion of the infinite vorticity/circulation of the dipole being ``torn apart,'' with the latter then regenerating with a new strength to instantaneously satisfy the regularized flow condition at the next instance of time. When done in a continuous manner, the result is a shed vortex sheet.
机译：对于任意内角的尖锐边缘，表明涡旋脱落的物理机理是在边缘处存在涡旋偶极子/双峰。这是通过在其循环增加时应用接近脱落边缘的点涡流的极限来实现的。然后，涡旋与其图像合并以产生偶极子。在有限的物体（双重连接的流体区域）（例如机翼）的情况下，该偶极子在物体周围建立了等效的约束循环。但是，复电位实际上并没有在后缘形成偶极子，而是这种假设电位决定了等效束缚涡流的强度，该强度代表了要摆脱的涡旋形成的影响。然后可以将涡旋脱落的机理解释为偶极子的无限涡度/循环的有限部分``被撕开''，然后偶极子以新的强度再生以在下一个实例瞬间满足正则流动条件时间。当以连续方式进行时，结果是涡流片脱落。

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