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arXiv 2412.07613math.NAcs.NAmath.APmath.PR
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完全随机欧拉方程的间断Galerkin方法

Discontinuous Galerkin methods for the complete stochastic Euler equations

Dominic Breit, Thamsanqa Castern Moyo, Philipp Öffner

AI总结:

针对含随机强迫项的完全随机欧拉方程,提出适配的熵耗散间断Galerkin谱元法,证明其依律收敛于耗散鞅解且强解期收敛阶至少1/2,数值验证了格式鲁棒性。

摘要:

近年来,随机效应在描述流体行为(尤其是湍流场景下)方面的重要性日益凸显。计算流体力学中描述无粘流体的核心模型是气体动力学欧拉方程,也是本文的研究重点。为纳入随机效应,我们在欧拉方程组的动量方程中引入随机强迫项。为求解该扩展方程组,我们采用包含有限体积设置的熵耗散间断Galerkin谱元法,将其调整适配随机欧拉方程,并分析其收敛性质。我们的分析基于Moyo于2023年在《J. Diff. Equ.》第365卷408-464页提出的耗散鞅解概念。在假设无真空形成且总能量有界的条件下,我们证明该格式依律收敛于耗散鞅解。在路径强解的存续期内,以相对能量的期望$L^1$范数衡量,我们实现了至少1/2阶的收敛性。这些结果与确定性情形下的相应结果形成对应。在数值模拟中,我们验证了该格式的鲁棒性,可视化了不同的随机实现,并分析了我们的理论结论。

英文摘要:

In recent years, stochastic effects have become increasingly relevant for describing fluid behaviour, particularly in the context of turbulence. The most important model for inviscid fluids in computational fluid dynamics are the Euler equations of gas dynamics which we focus on in this paper. To take stochastic effects into account, we incorporate a stochastic forcing term in the momentum equation of the Euler system. To solve the extended system, we apply an entropy dissipative discontinuous Galerkin spectral element method including the Finite Volume setting, adjust it to the stochastic Euler equations and analyze its convergence properties. Our analysis is grounded in the concept of dissipative martingale solutions, as recently introduced by Moyo (J. Diff. Equ. 365, 408-464, 2023). Assuming no vacuum formation and bounded total energy, we proof that our scheme converges in law to a dissipative martingale solution. During the lifespan of a pathwise strong solution, we achieve convergence of at least order 1/2, measured by the expected $L^1$ norm of the relative energy. The results built a counterpart of corresponding results in the deterministic case. In numerical simulations, we show the robustness of our scheme, visualise different stochastic realizations and analyze our theoretical findings.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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