湍流混合对临界特性的影响
Effects of Turbulent Mixing on the Critical Behavior
摘要：
利用重整化群研究了强各向异性湍流混合对临界行为的影响。考虑两种模型：平衡模型A，它描述了一个非保守的标量序参量的纯弛豫动力学，和Gribov模型，它描述了在反应扩散系统的吸收和波动状态之间的非平衡相变。的速度是仿照d维推广的随机剪切流的背景下，被动标量平流的Avellaneda和Majda介绍。存在新的非平衡类型的临界制度（普适类）的建立。
英文摘要：
Effects of strongly anisotropic turbulent mixing on the critical behavior are studied by means of the renormalization group. Two models are considered: the equilibrium model A, which describes purely relaxational dynamics of a nonconserved scalar order parameter, and the Gribov model, which describes the nonequilibrium phase transition between the absorbing and fluctuating states in a reaction-diffusion system. The velocity is modelled by the d-dimensional generalization of the random shear flow introduced by Avellaneda and Majda within the context of passive scalar advection. Existence of new nonequilibrium types of critical regimes (universality classes) is established.
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