Lamb dipole stability without sign condition
Abstract
For the 2D incompressible Euler equations on the half-plane, we establish Lyapunov stability of the Lamb dipole without sign condition on the vorticity. The main challenge arises from growth of the x2 weighted norm for mixed sign vorticities, whereas this norm is conserved and responsible for dipole stability in the single signed vorticity case. This difficulty is handled by a Lagrangian bootstrap argument, based on carefully dividing the solution into several pieces and analyzing interactions among them, with the most delicate interaction involving vorticity drifting to infinity in the vertical direction. We expect that the strategy developed here will provide a starting point for the stability analysis of more general vortex configurations, including interactions among multiple vortex dipoles and among multiple vortex rings in settings involving mixed-sign vorticity.
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BibTeX
@misc{abe2026lamb,
title = {{Lamb dipole stability without sign condition}},
author = {Ken Abe and Kyudong Choi and In-Jee Jeong and Guolin Qin},
howpublished = {arXiv},
year = {2026},
month = oct,
doi = {10.48550/arxiv.2609.33578},
eprint = {2609.33578},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2609.33578},
note = {CC BY 4.0},
}
RIS
TY - UNPB
TI - Lamb dipole stability without sign condition
AU - Ken Abe
AU - Kyudong Choi
AU - In-Jee Jeong
AU - Guolin Qin
PY - 2026
DA - 2026/10/12
PB - arXiv
DO - 10.48550/arxiv.2609.33578
UR - https://arxiv.org/abs/2609.33578
AB - For the 2D incompressible Euler equations on the half-plane, we establish Lyapunov stability of the Lamb dipole without sign condition on the vorticity. The main challenge arises from growth of the x_2 weighted norm for mixed sign vorticities, whereas this norm is conserved and responsible for dipole stability in the single signed vorticity case. This difficulty is handled by a Lagrangian bootstrap argument, based on carefully dividing the solution into several pieces and analyzing interactions among them, with the most delicate interaction involving vorticity drifting to infinity in the vertical direction. We expect that the strategy developed here will provide a starting point for the stability analysis of more general vortex configurations, including interactions among multiple vortex dipoles and among multiple vortex rings in settings involving mixed-sign vorticity.
ER -