Non-Linear Singularity Formation for Circular Vortex Sheets
| Autor: | Murray, Ryan, Wilcox, Galen |
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| Rok vydání: | 2023 |
| Předmět: | |
| Druh dokumentu: | Working Paper |
| Popis: | We study the evolution of vortex sheets according to the Birkhoff-Rott equation, which describe the motion of sharp shear interfaces governed by the incompressible Euler equation in two dimensions. In a recent work, the authors demonstrated within this context a marginal linear stability of circular vortex sheets, standing in sharp contrast with classical instability of the flat vortex sheet, which is known as the Kelvin-Helmholtz instability. This article continues that analysis by investigating how non-linear effects induce singularity formation near the circular vortex sheet. In high-frequency regimes, the singularity formation is primarily driven by a complex-valued, conjugated Burgers equation, which we study by modifying a classical argument from hyperbolic conservation laws. This provides a deeper understanding of the mechanisms driving the breakdown of circular vortex sheets, which are observed both numerically and experimentally. Comment: The paper "The Influence of Vortex Sheet Geometry on the Kelvin-Helmholtz Instability" contains a critical error which is repeated in this follow-up work. The mistake renders the linear and nonlinear transport equations (1.4) and (2.4) incorrect |
| Databáze: | arXiv |
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