Acta mathematica scientia,Series B ›› 2023, Vol. 43 ›› Issue (4): 1668-1674.doi: 10.1007/s10473-023-0414-y

Previous Articles     Next Articles

THE GLOBAL EXISTENCE OF BV SOLUTIONS OF THE ISENTROPIC p-SYSTEM WITH LARGE INITIAL DATA

Fei WU, Zejun WANG, Fangqi CHEN   

  1. Department of Mathematics, Nanjing University of Aeronautics and Astronautics, Nanjing 211106, China; Key Laboratory of Mathematical Modelling and High Performance Computing of Air Vehicles (NUAA), MIIT, Nanjing 211106, China
  • Received:2022-04-25 Published:2023-08-08
  • Contact: †Fangqi CHEN, E-mail: fangqichen1963@126.com
  • About author:Fei WU, E-mail: wufei003@nuaa.edu.cn; Zejun WANG, E-mail: wangzejun@gmail.com
  • Supported by:
    *Zejun Wang was partially supported by the NSFC (11671193); Fangqi Chen was partially supported by the NSFC (12172166, 11872201).

Abstract: In this paper, we study the global existence of BV solutions of the initial value problem for the isentropic p-system, where the state equation of the gas is given by P=Avγ. For γ>1, the general existence result for large initial data has not been obtained. By using the Glimm scheme, Nishida, Smoller and Diperna successively obtained the global existence results for (γ1)TV(v0(x),u0(x)) being small. In the present paper, by adopting a rescaling technique, we improve these results and obtain the global existence result under the condition that (γ1)γ+1(TV(v0(x)))γ1(TV(u0(x)))2 is small, which implies that, for fixed γ>1, either TV(v0(x)) or TV(u0(x)) can be arbitrarily large.

Key words: conservation laws, p-system, vanishing viscosity method, BV solutions

Trendmd