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arXiv 2007.14735math.APmath.OCmath.PR
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一类随机对流Cahn-Hilliard方程的分析与最优速度控制

Analysis and optimal velocity control of a stochastic convective Cahn-Hilliard equation

Luca Scarpa

摘要:

研究了一类带随机乘性噪声和随机对流项的Cahn-Hilliard方程。该模型描述了等温相分离发生在一个移动的流体,并占在微观水平上出现的随机性在相分离本身和流动诱导过程。对流项中的随机分量的要求自然源于应用,因为流体的搅拌过程通常由机械或磁性装置引起。适定性的状态系统的处理和优化的标准跟踪型成本相对于速度控制的研究。证明了最优控制的存在性,并证明了控制-状态映射的Gâteaux-Fréchet可微性.最后,分析了相应的伴随倒向问题,并利用一个包含内在伴随变量的变分不等式导出了最优性的一阶必要条件.

英文摘要:

A Cahn-Hilliard equation with stochastic multiplicative noise and a random convection term is considered. The model describes isothermal phase-separation occurring in a moving fluid, and accounts for the randomness appearing at the microscopic level both in the phase-separation itself and in the flow-inducing process. The call for a random component in the convection term stems naturally from applications, as the fluid's stirring procedure is usually caused by mechanical or magnetic devices. Well-posedness of the state system is addressed and optimisation of a standard tracking type cost with respect to the velocity control is then studied. Existence of optimal controls is proved and the Gâteaux-Fréchet differentiability of the control-to-state map is shown. Lastly, the corresponding adjoint backward problem is analysed, and first-order necessary conditions for optimality are derived in terms of a variational inequality involving the intrinsic adjoint variables.

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