Limits of Riemann solutions for isentropic MHD in a variable
cross-section duct as magnetic field vanishes
- Wancheng Sheng,
- Tao Xiao
Abstract
The stability for magnetic field to the solution of the Riemann problem
for the polytropic fluid in a variable cross-section duct is discussed.
By the vanishing magnetic field method, the stable solutions are
determined by comparing the limit solutions with the solutions of the
Riemann problem for the polytropic fluid in a duct obtained by the
entropy rate admissibility criterion.