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arXiv 1708.02490math.AP
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具有随机初值的非线性守恒律方程的N-点函数族

Hierarchies of N-Point Functions for Nonlinear Conservation Laws with Random Initial Data

Carey Caginalp

摘要:

随机初始条件下的非线性守恒律在激波和稀薄化的演化和相互作用中提出了基本问题。使用一个离散集的值的解决方案,我们推导出一个层次的方程的状态,在两种不同的方法。这个层次涉及n-点函数,即解在不同位置取不同值的概率,根据n+1-点函数。在第一种方法中,这些方程可以闭合,但所得到的解在激波相互作用中并不持久。在第二种方法中,n点函数用n+1-点函数表示,并且通过冲击碰撞保持有效。

英文摘要:

Nonlinear conservation laws subject to random initial conditions pose fundamental problems in the evolution and interactions of shocks and rarefactions. Using a discrete set of values for the solution, we derive a hierarchy of equations in terms of the states in two different methods. This hierarchy involves the n-point function, the probability that the solution takes on various values at different positions, in terms of the n+1-point function. In the first approach, these equations can be closed but the resulting solutions do not persist through shock interactions. In our second approach, the n-point function is expressed in terms of the n+1-point functions, and remains valid through collisions of shocks.

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