Acta mathematica scientia, Series B >
GLOBAL ASYMPTOTICS TOWARD THE REREFACTION WAVES FOR A PARABOLIC-ELLIPTIC SYSTEM RELATED TO THE CAMASSA-HOLM SHALLOW WATER EQUATION
Received date: 2006-09-30
Online published: 2009-03-20
Supported by
This work was supported by two grants from the National Natural Science Foundation of China under contracts 10431060 and 10329101, respectively
This article is concerned with the global existence and large time behavior of solutions to the Cauchy problem for
a parabolic-elliptic system related to the Camassa-Holm shallow water equation
{ut +(u2/2)x = εuxx, t > 0, x ∈R,
-αPxx + P = f(u) +α/2 u2x-1/2 u2, t >, x ∈R, (E)
with the initial data
u(0, x) = u0(x) → u±, as x → ±∝. (I)
Here, u− < u+ are two constants and f(u) is a sufficiently smooth function satisfying f′′(u) > 0 for all u under
consideration. Main aim of this article is to study the relation between solutions to the above Cauchy problem and those to the Riemann problem of the following nonlinear conservation law
{ut + f(u)x = 0,
u(0, x) ={u−, x < 0,
u+, x > 0. (R)
It is well known that if u− < u+, the above Riemann problem admits a unique global entropy solution uR(x/t)
uR(x/t) ={u−, x ≤ f′(u−)t,
(f′)−1(x/t), f′(u−)t ≤ x ≤ f′(u+)t,
u+, x ≥ f′(u+)t.
Let U(t, x) be the smooth approximation of the rarefaction wave profile constructed similar to that of [21, 22, 23], we show that if u0(x) − U(0, x) ∈H1(R) and u− < u+, the above Cauchy problem (E) and (I) admits a unique global classical solution u(t, x) which tends to the rarefaction wave uR(x/t) as t → +∝ in the maximum norm. The proof is given by an elementary energy method.
Ma Xuan|Yin Hui|Jing Jin . GLOBAL ASYMPTOTICS TOWARD THE REREFACTION WAVES FOR A PARABOLIC-ELLIPTIC SYSTEM RELATED TO THE CAMASSA-HOLM SHALLOW WATER EQUATION[J]. Acta mathematica scientia, Series B, 2009 , 29(2) : 371 -390 . DOI: 10.1016/S0252-9602(09)60037-0
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