We study a system of conservation laws that describes
multi-species kinematic flows with an emphasis on
models of multiclass traffic flow and of the creaming of oil-in-water
dispersions. The flux can have a spatial discontinuity which models
abrupt changes of road surface conditions or of the
cross-sectional area in a settling vessel. For this system,
an entropy inequality is proposed that singles out a relevant
solution at the interface. It is shown that "piecewise smooth" limit solutions generated
by the semi-discrete version of a numerical scheme the authors recently proposed
[R. Bürger, A. García, K.H. Karlsen and J.D. Towers,
J. Engrg. Math. 60:387-425, 2008] satisfy this entropy inequality.
We present an improvement to this scheme by means of a special
interface flux that is activated only at a few grid points where the
discontinuity is located. While an entropy inequality is established for
the semi-discrete versions of the scheme only, numerical experiments
support that the fully discrete scheme are equally entropy-admissible.
Citation: Raimund Bürger, Kenneth H. Karlsen, John D. Towers. On some difference schemes and entropy conditions for a class ofmulti-species kinematic flow models with discontinuous flux[J]. Networks and Heterogeneous Media, 2010, 5(3): 461-485. doi: 10.3934/nhm.2010.5.461
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Raimund Bürger, Kenneth H. Karlsen, John D. Towers .
On some difference schemes and entropy conditions for a class of
multi-species kinematic flow models with discontinuous flux. Networks and Heterogeneous Media, 2010, 5(3): 461-485.
doi: 10.3934/nhm.2010.5.461
|
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Abstract
We study a system of conservation laws that describes
multi-species kinematic flows with an emphasis on
models of multiclass traffic flow and of the creaming of oil-in-water
dispersions. The flux can have a spatial discontinuity which models
abrupt changes of road surface conditions or of the
cross-sectional area in a settling vessel. For this system,
an entropy inequality is proposed that singles out a relevant
solution at the interface. It is shown that "piecewise smooth" limit solutions generated
by the semi-discrete version of a numerical scheme the authors recently proposed
[R. Bürger, A. García, K.H. Karlsen and J.D. Towers,
J. Engrg. Math. 60:387-425, 2008] satisfy this entropy inequality.
We present an improvement to this scheme by means of a special
interface flux that is activated only at a few grid points where the
discontinuity is located. While an entropy inequality is established for
the semi-discrete versions of the scheme only, numerical experiments
support that the fully discrete scheme are equally entropy-admissible.