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A New Entropic Riemann Solver of Conservation Law of Mixed Type Including Ziti’s δ-Method with some Experimental Tests

Received: 30 June 2017     Accepted: 11 July 2017     Published: 26 September 2017
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Abstract

Many problems in fluid mechanics and material sciences deal with liquid-vapour flows. In these flows, the ideal gas assumption is not accurate and the van der Waals equation of state is usually used. This equation of state is non-convex and causes the solution domain to have two hyperbolic regions separated by an elliptic region. Therefore, the governing equations of these flows have a mixed elliptic-hyperbolic nature. Numerical oscillations usually appear with standard finite-difference space discretization schemes, and they persist when the order of accuracy of the semi-discrete scheme is increased. In this study, we propose to use a new method called δ-ziti’s method for solving the governing equations. This method gives a new class of semi discrete, high-order scheme which are entropy conservative if the viscosity term is neglected. We implement a high resolution scheme for our mixed type problems that select the same viscosity solution as the Lax Friederich scheme with higher resolution. Several tests have been carried out to compare our results with those of [6] [9] [16], in the same situations, we obtained the same results but faster thanks to the CFL condition which reaches 0.8 and the simplicity of the method. We consider three types of pressure in these tests: Cubic, Van der Waals and linear in pieces. The comparison proved that the δ-ziti's method respects the generalized Liu entropy conditions, e.g. the existence of a viscous profile.

Published in Applied and Computational Mathematics (Volume 6, Issue 5)
DOI 10.11648/j.acm.20170605.12
Page(s) 222-232
Creative Commons

This is an Open Access article, distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution and reproduction in any medium or format, provided the original work is properly cited.

Copyright

Copyright © The Author(s), 2017. Published by Science Publishing Group

Keywords

Hyperbolic, Van Der Waals, δ-ziti’s Method, System Mixed Type, the Lax-Friedrichs Scheme, Shock Wave, Rarefaction Wave, Viscous Profile

References
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[2] R. Abeyaratne and J. K. Knowles, “Implications of viscosity and strain gradient effects for the kinetics of propagating phase boundaries”, SIAM J. Appl. Math. 51, 1205 (1991).
[3] M. Affouf and R. Caflisch, “A numerical study of Riemann problem solutions and stability for a system of viscous conservation laws of mixed type”, SIAM J. Appl. Math. 51, 605 (1991).
[4] L. BSISS, C. ZITI, “A new numerical method for the integral approximation and solving the differential problems: Non-oscillating scheme, detecting the singularity in one and several dimensions”, J. Ponte, Vol. 73, Issue 2, pp. 126-172.
[5] L. BSISS, C. ZITI, “A new Approximation (ziti’s δ-scheme) of the Entropic (Admissible) Solution of the Hyperbolic Problems in One and Several Dimensions: Applications to Convection, Burgers, Gas Dynamics and Some Biological Problems”, Turkish Journal of Analysis and Number Theory. 2016, 4(4), 98-108.
[6] C. Chalons and P. G. Le Floch, “High-Order Entropy-Conservative and Kinetic Relations for van der Waals Fluids”, Journal of Computational Physics. (2001), 184-206.
[7] C. Chalons and P. G. LeFloch, “A fully discrete scheme for diffusive-dispersive conservation laws”, Numerische Math. (2001), to appear.
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[16] S. Jin, “Numerical integrations of systems of conservation laws of mixed type”, SIAM J. Appl. Math. 55, 1536 (1995).
[17] P. G. Le Floch, “Propagating phase boundaries: Formulation of the problem and existence via the Glimm scheme”, Arch. Rational Mech. Anal. 123, 153 (1993).
[18] P. G. Le Floch, “An introduction to nonclassical shocks of systems of conservation laws, in Proceedings of the International School on Theory and Numerics for Conservation Laws”, Freiburg Littenweiler (Germany), 20–24 October 1997, edited by D. Kr¨oner, M. Ohlberger, and C. Rohde, Lecture Notes in Computational Science and Engineering, (1998), p. 28.
[19] P. G. LeFloch, “Hyperbolic Systems of Conservation Laws: The Theory of Classical and Nonclassical Shock Waves”, E. T. H. Lecture Notes Series, 2001, to appear.
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Cite This Article
  • APA Style

    Larbi Bsiss, Cherif Ziti. (2017). A New Entropic Riemann Solver of Conservation Law of Mixed Type Including Ziti’s δ-Method with some Experimental Tests. Applied and Computational Mathematics, 6(5), 222-232. https://doi.org/10.11648/j.acm.20170605.12

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    ACS Style

    Larbi Bsiss; Cherif Ziti. A New Entropic Riemann Solver of Conservation Law of Mixed Type Including Ziti’s δ-Method with some Experimental Tests. Appl. Comput. Math. 2017, 6(5), 222-232. doi: 10.11648/j.acm.20170605.12

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    AMA Style

    Larbi Bsiss, Cherif Ziti. A New Entropic Riemann Solver of Conservation Law of Mixed Type Including Ziti’s δ-Method with some Experimental Tests. Appl Comput Math. 2017;6(5):222-232. doi: 10.11648/j.acm.20170605.12

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  • @article{10.11648/j.acm.20170605.12,
      author = {Larbi Bsiss and Cherif Ziti},
      title = {A New Entropic Riemann Solver of Conservation Law of Mixed Type Including Ziti’s δ-Method with some Experimental Tests},
      journal = {Applied and Computational Mathematics},
      volume = {6},
      number = {5},
      pages = {222-232},
      doi = {10.11648/j.acm.20170605.12},
      url = {https://doi.org/10.11648/j.acm.20170605.12},
      eprint = {https://article.sciencepublishinggroup.com/pdf/10.11648.j.acm.20170605.12},
      abstract = {Many problems in fluid mechanics and material sciences deal with liquid-vapour flows. In these flows, the ideal gas assumption is not accurate and the van der Waals equation of state is usually used. This equation of state is non-convex and causes the solution domain to have two hyperbolic regions separated by an elliptic region. Therefore, the governing equations of these flows have a mixed elliptic-hyperbolic nature. Numerical oscillations usually appear with standard finite-difference space discretization schemes, and they persist when the order of accuracy of the semi-discrete scheme is increased. In this study, we propose to use a new method called δ-ziti’s method for solving the governing equations. This method gives a new class of semi discrete, high-order scheme which are entropy conservative if the viscosity term is neglected. We implement a high resolution scheme for our mixed type problems that select the same viscosity solution as the Lax Friederich scheme with higher resolution. Several tests have been carried out to compare our results with those of [6] [9] [16], in the same situations, we obtained the same results but faster thanks to the CFL condition which reaches 0.8 and the simplicity of the method. We consider three types of pressure in these tests: Cubic, Van der Waals and linear in pieces. The comparison proved that the δ-ziti's method respects the generalized Liu entropy conditions, e.g. the existence of a viscous profile.},
     year = {2017}
    }
    

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  • TY  - JOUR
    T1  - A New Entropic Riemann Solver of Conservation Law of Mixed Type Including Ziti’s δ-Method with some Experimental Tests
    AU  - Larbi Bsiss
    AU  - Cherif Ziti
    Y1  - 2017/09/26
    PY  - 2017
    N1  - https://doi.org/10.11648/j.acm.20170605.12
    DO  - 10.11648/j.acm.20170605.12
    T2  - Applied and Computational Mathematics
    JF  - Applied and Computational Mathematics
    JO  - Applied and Computational Mathematics
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    EP  - 232
    PB  - Science Publishing Group
    SN  - 2328-5613
    UR  - https://doi.org/10.11648/j.acm.20170605.12
    AB  - Many problems in fluid mechanics and material sciences deal with liquid-vapour flows. In these flows, the ideal gas assumption is not accurate and the van der Waals equation of state is usually used. This equation of state is non-convex and causes the solution domain to have two hyperbolic regions separated by an elliptic region. Therefore, the governing equations of these flows have a mixed elliptic-hyperbolic nature. Numerical oscillations usually appear with standard finite-difference space discretization schemes, and they persist when the order of accuracy of the semi-discrete scheme is increased. In this study, we propose to use a new method called δ-ziti’s method for solving the governing equations. This method gives a new class of semi discrete, high-order scheme which are entropy conservative if the viscosity term is neglected. We implement a high resolution scheme for our mixed type problems that select the same viscosity solution as the Lax Friederich scheme with higher resolution. Several tests have been carried out to compare our results with those of [6] [9] [16], in the same situations, we obtained the same results but faster thanks to the CFL condition which reaches 0.8 and the simplicity of the method. We consider three types of pressure in these tests: Cubic, Van der Waals and linear in pieces. The comparison proved that the δ-ziti's method respects the generalized Liu entropy conditions, e.g. the existence of a viscous profile.
    VL  - 6
    IS  - 5
    ER  - 

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Author Information
  • Department of Mathematics, University Moulay Ismail, Meknes, Morocco

  • Department of Mathematics, University Moulay Ismail, Meknes, Morocco

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