Limit of Riemann Solutions to the Nonsymmetric System of Keyfitz-Kranzer Type
The limit of Riemann solutions to the nonsymmetric system of Keyfitz-Kranzer type with a scaled pressure is considered for both polytropic gas and generalized Chaplygin gas. In the former case, the delta shock wave can be obtained as the limit of shock wave and contact discontinuity when u->u+ an...
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Wiley
2014-01-01
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| Series: | The Scientific World Journal |
| Online Access: | http://dx.doi.org/10.1155/2014/287256 |
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| author | Lihui Guo Gan Yin |
| author_facet | Lihui Guo Gan Yin |
| author_sort | Lihui Guo |
| collection | DOAJ |
| description | The limit of Riemann solutions to the nonsymmetric system of Keyfitz-Kranzer type with a scaled pressure is considered for both polytropic gas and generalized Chaplygin gas. In the former case, the delta shock wave can be obtained as the limit of shock wave and contact discontinuity when u->u+ and the parameter ϵ tends to zero. The point is, the delta shock wave is not the one of transport equations, which is obviously different from cases of some other systems such as Euler equations or relativistic Euler equations. For the generalized Chaplygin gas, unlike the polytropic or isothermal gas, there exists a certain critical value ϵ2 depending only on the Riemann initial data, such that when ϵ drops to ϵ2, the delta shock wave appears as u->u+, which is actually a delta solution of the same system in one critical case. Then as ϵ becomes smaller and goes to zero at last, the delta shock wave solution is the exact one of transport equations. Furthermore, the vacuum states and contact discontinuities can be obtained as the limit of Riemann solutions when u-<u+ and u-=u+, respectively. |
| format | Article |
| id | doaj-art-150de8ad0de44b51b25020f5404180b4 |
| institution | Kabale University |
| issn | 2356-6140 1537-744X |
| language | English |
| publishDate | 2014-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | The Scientific World Journal |
| spelling | doaj-art-150de8ad0de44b51b25020f5404180b42025-08-20T03:54:29ZengWileyThe Scientific World Journal2356-61401537-744X2014-01-01201410.1155/2014/287256287256Limit of Riemann Solutions to the Nonsymmetric System of Keyfitz-Kranzer TypeLihui Guo0Gan Yin1College of Mathematics and System Sciences, Xinjiang University, Urumqi 830046, ChinaCollege of Mathematics and System Sciences, Xinjiang University, Urumqi 830046, ChinaThe limit of Riemann solutions to the nonsymmetric system of Keyfitz-Kranzer type with a scaled pressure is considered for both polytropic gas and generalized Chaplygin gas. In the former case, the delta shock wave can be obtained as the limit of shock wave and contact discontinuity when u->u+ and the parameter ϵ tends to zero. The point is, the delta shock wave is not the one of transport equations, which is obviously different from cases of some other systems such as Euler equations or relativistic Euler equations. For the generalized Chaplygin gas, unlike the polytropic or isothermal gas, there exists a certain critical value ϵ2 depending only on the Riemann initial data, such that when ϵ drops to ϵ2, the delta shock wave appears as u->u+, which is actually a delta solution of the same system in one critical case. Then as ϵ becomes smaller and goes to zero at last, the delta shock wave solution is the exact one of transport equations. Furthermore, the vacuum states and contact discontinuities can be obtained as the limit of Riemann solutions when u-<u+ and u-=u+, respectively.http://dx.doi.org/10.1155/2014/287256 |
| spellingShingle | Lihui Guo Gan Yin Limit of Riemann Solutions to the Nonsymmetric System of Keyfitz-Kranzer Type The Scientific World Journal |
| title | Limit of Riemann Solutions to the Nonsymmetric System of Keyfitz-Kranzer Type |
| title_full | Limit of Riemann Solutions to the Nonsymmetric System of Keyfitz-Kranzer Type |
| title_fullStr | Limit of Riemann Solutions to the Nonsymmetric System of Keyfitz-Kranzer Type |
| title_full_unstemmed | Limit of Riemann Solutions to the Nonsymmetric System of Keyfitz-Kranzer Type |
| title_short | Limit of Riemann Solutions to the Nonsymmetric System of Keyfitz-Kranzer Type |
| title_sort | limit of riemann solutions to the nonsymmetric system of keyfitz kranzer type |
| url | http://dx.doi.org/10.1155/2014/287256 |
| work_keys_str_mv | AT lihuiguo limitofriemannsolutionstothenonsymmetricsystemofkeyfitzkranzertype AT ganyin limitofriemannsolutionstothenonsymmetricsystemofkeyfitzkranzertype |