Geometric Properties of the Maxwell Set and a Vortex Filament Structure for Burgers Equation |
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Authors: | A D Neate A Truman |
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Institution: | (1) Department of Mathematics, Swansea University, Singleton Park, Swansea, SA2 8PP, Wales, UK |
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Abstract: | The inviscid limit of the stochastic Burgers equation is discussed in terms of the level surfaces of the minimising Hamilton–Jacobi
function, the classical mechanical caustic and the Maxwell set and their algebraic pre-images under the classical mechanical
flow map. We examine the geometry of the Maxwell set in terms of the behaviour of the pre-Maxwell set, the pre-caustic and
the pre-level surfaces. In particular, contrary to the ideas of Helmholtz and Lord Kelvin, we prove that even if initially
the fluid flow is irrotational, in the inviscid limit, associated with the advent of the Maxwell set a non-zero vorticity
vector forms in the fluid with vortex lines on the Maxwell set. This suggests that in quite general circumstances for small
viscosity there is a vortex filament structure near the Maxwell set for both deterministic and stochastic Burgers equations.
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Keywords: | Mathematics Subject Classification (2000)" target="_blank">Mathematics Subject Classification (2000) 35R66 35Q53 60H15 60H30 76M35 |
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