Formation of Delta-Shocks and Vacuum States in the Vanishing Pressure
Limit of Solutions to the Isentropic Euler Equations
Authors: Gui-Qiang Chen and Hailiang Liu
Title:
Formation of Delta-Shocks and Vacuum States in the Vanishing Pressure
Limit of Solutions to the Isentropic Euler Equations
Abstract
The phenomena of concentration and cavitation and the formation of
$\delta$-shocks and vacuum states in the vanishing pressure limit are
identified and analyzed in inviscid compressible fluid flow.
It is shown that any two-shock Riemann solution of the Euler equations
for isentropic fluids tends to a $\delta$-shock solution of the Euler
equations for pressureless fluids, and the intermediate density between
the two shocks tends to a $\delta$-mass that forms the $\delta$-shock;
by contrast, any two-rarefaction-wave Riemann solution for isentropic
fluids tends to a two-contact-discontinuity solution whose
intermediate state between the two contact discontinuities is a vacuum
state for pressureless fluids,
even when the initial data stay away from the vacuum.
Some numerical results, which exhibit the formation processes of
$\delta$-shocks and vacuum states, are presented.
This article will be appeared in:
SIAM J. Mathematical Analysis
vol. 34,
pages 925-938 (2003)
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A closely related paper is Change me.
Author Address
Gui-Qiang Chen
Department of Mathematics
Northwestern University
Evanston, IL 60208-2730
gqchen@math.nwu.edu