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arXiv 0904.3572math.AP
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具有熵的双曲-抛物方程组的弱非线性耗散逼近

Weakly Nonlinear-Dissipative Approximations of Hyperbolic-Parabolic Systems with Entropy

Ning Jiang, C. David Levermore

摘要:

双曲抛物系统具有空间均匀的定态。当耗散是弱的,人们可以推导出弱非线性耗散近似,管理这些恒定状态的扰动。这些近似是二次非线性的。当原系统具有熵时,近似在自然希尔伯特空间中形式上是耗散的。我们证明了当逼近是严格耗散的时,对于该希尔伯特空间中的所有初始数据,它具有整体弱解。我们还证明了它的一个弱-强唯一性定理,并给出了它是严格耗散的Kawashima型判据。我们应用该理论的可压缩Navier-Stokes系统。

英文摘要:

Hyperbolic-parabolic systems have spatially homogenous stationary states. When the dissipation is weak, one can derive weakly nonlinear-dissipative approximations that govern perturbations of these constant states. These approximations are quadratically nonlinear. When the original system has an entropy, the approximation is formally dissipative in a natural Hilbert space. We show that when the approximation is strictly dissipative it has global weak solutions for all initial data in that Hilbert space. We also prove a weak-strong uniqueness theorem for it. In addition, we give a Kawashima type criterion for this approximation to be strictly dissipative. We apply the theory to the compressible Navier-Stokes system.

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