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arXiv 2008.09451math.APcs.NAmath-phmath.MPmath.NA
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标量图像测速的稳定性估计

Stability estimate for scalar image velocimetry

E. Burman, J. J. J. Gillissen, L. Oksanen

摘要:

本文分析了标量图像测速系统的偏微分方程组的稳定性。我们首先回顾了一个成功的数值技术,重建速度矢量${u}$从图像的被动标量场$ψ$通过最小化的成本功能,惩罚重建的标量场$ϕ$和测量的标量场$ψ$之间的差异,$ϕ$平流的约束下,重建的速度场${u}$,这再次是由Navier-斯托克斯方程。我们研究了重建的稳定性,通过将这种方法应用到二维湍流中的合成标量场,这是由数值模拟产生的。然后对非线性耦合问题进行了数学分析,证明了在二维情形下,Navier-斯托克斯方程的光滑解是由测量的标量场唯一确定的。我们还证明了一个条件稳定性估计表明,从测量的标量场$ψ$的重建速度场$u$的映射,在任何内部子集,是Hölder连续的。

英文摘要:

In this paper we analyse the stability of the system of partial differential equations modelling scalar image velocimetry. We first revisit a successful numerical technique to reconstruct velocity vectors ${u}$ from images of a passive scalar field $ψ$ by minimising a cost functional, that penalises the difference between the reconstructed scalar field $ϕ$ and the measured scalar field $ψ$, under the constraint that $ϕ$ is advected by the reconstructed velocity field ${u}$, which again is governed by the Navier-Stokes equations. We investigate the stability of the reconstruction by applying this method to synthetic scalar fields in two-dimensional turbulence, that are generated by numerical simulation. Then we present a mathematical analysis of the nonlinear coupled problem and prove that, in the two dimensional case, smooth solutions of the Navier-Stokes equations are uniquely determined by the measured scalar field. We also prove a conditional stability estimate showing that the map from the measured scalar field $ψ$ to the reconstructed velocity field $u$, on any interior subset, is Hölder continuous.

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