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arXiv 2603.01709math.NAcs.NA
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一种用于阻尼哈密顿系统的能量稳定分裂指数积分统一框架

A unified framework of energy-stable splitting exponential integrators for damped Hamiltonian systems

Sun Yat-sen University(中山大学);Shandong University(山东大学);Fudan University(复旦大学)

Lu Li, Xiaoli Li, Zaijiu Shang, Quanquan Xu

AI总结:

本文提出了一种统一的分裂指数积分框架,用于高效且稳定地模拟受线性扰动的哈密顿系统。

摘要:

本文研究了受线性扰动影响的哈密顿系统长期数值积分问题。通过引入能量诱导度量,我们建立了一个简洁、坐标无关的判据,用于确保对广泛线性扰动哈密顿系统的物理能量衰减。由于保守效应和耗散效应不能总能合并为单一梯度结构耗散,而经典为梯度流开发的能量稳定方法无法直接扩展到这种设置,我们提出了一种统一的框架,包含两种高效的、能量稳定的分裂指数积分器(SEI):SEISAV(基于标量辅助变量的SEI)和SEILM(基于拉格朗日乘数的SEI)。SEISAV方案将精确阻尼子流与基于SAV更新的指数积分器结合,用于哈密顿子流,并且在每个时间步只需求解一个一维线性代数方程。我们证明了对于修改后的能量,其离散衰减是无条件的,这反映了连续的能量耗散机制。为了强制原能量的衰减而不是修改后的能量,我们进一步开发了SEILM,通过在分裂指数框架内引入拉格朗日乘数公式,导致每个时间步只需求解一个非线性代数方程。在代表性线性阻尼哈密顿模型上的数值实验验证了预测的收敛速率、能量稳定性以及与最新方案相比的竞争力,表明所提出的框架为模拟线性扰动哈密顿动力学提供了一种简单且稳健的方法。

英文摘要:

In this work, we study long-time numerical integration of Hamiltonian systems subject to linear perturbations. We assume the energy-compatible linear-damping condition, which ensures that the physical energy is nonincreasing along the linear damping subflow. Since the conservative and dissipative effects cannot always be merged into a single gradient-structured dissipation and classical energy-stable methods developed for gradient flows cannot directly extend to this setting, we propose a unified framework of two efficient and energy-stable splitting exponential integrators (SEI) to separately handle the dissipative and conservative parts: SEISAV (SEI based on the scalar auxiliary variable) and SEILM (SEI based on Lagrange multiplier). The SEISAV scheme composes the exact damping subflow with an exponential integrator based on the SAV update for the Hamiltonian subflow and requires solving only a scalar linear equation at each time step. We prove a discrete modified-energy dissipation law for SEISAV that mirrors the continuous energy-dissipation mechanism. To enforce decay of the original energy rather than a modified one, we further develop SEILM by incorporating a Lagrange-multiplier formulation within the splitting exponential framework, leading to solving only a scalar nonlinear equation at each time step. Numerical experiments on representative linearly damped Hamiltonian models confirm the designed second-order accuracy, energy stability, and competitive efficiency relative to state-of-the-art schemes, indicating that the proposed framework provides a simple and robust approach for simulating linearly perturbed Hamiltonian dynamics.

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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