Communications on Applied Mathematics and Computation ›› 2023, Vol. 5 ›› Issue (1): 343-369.doi: 10.1007/s42967-021-00171-0

• ORIGINAL PAPERS • Previous Articles     Next Articles

Quinpi: Integrating Conservation Laws with CWENO Implicit Methods

G. Puppo1, M. Semplice2, G. Visconti1   

  1. 1 Dipartimento di Matematica, Università La Sapienza, P. le Aldo Moro, 5, 00185 Roma, Italy;
    2 Dipartimento di Scienza e Alta Tecnologia, Università dell'Insubria, Via Valleggio, 11, 22100 Como, Italy
  • Received:2021-01-31 Revised:2021-08-02 Online:2023-03-20 Published:2023-03-08
  • Contact: G. Puppo,E-mail:gabriella.puppo@uniroma1.it;M. Semplice,E-mail:matteo.semplice@uninsubria.it;G. Visconti,E-mail:giuseppe.visconti@uniroma1.it E-mail:gabriella.puppo@uniroma1.it;matteo.semplice@uninsubria.it;giuseppe.visconti@uniroma1.it
  • Supported by:
    This work was partly supported by MIUR (Ministry of University and Research) PRIN2017 project number 2017KKJP4X, and Progetto di Ateneo Sapienza, number RM120172B41DBF3A.

Abstract: Many interesting applications of hyperbolic systems of equations are stiff, and require the time step to satisfy restrictive stability conditions. One way to avoid small time steps is to use implicit time integration. Implicit integration is quite straightforward for first-order schemes. High order schemes instead also need to control spurious oscillations, which requires limiting in space and time also in the linear case. We propose a framework to simplify considerably the application of high order non-oscillatory schemes through the introduction of a low order implicit predictor, which is used both to set up the nonlinear weights of a standard high order space reconstruction, and to achieve limiting in time. In this preliminary work, we concentrate on the case of a third-order scheme, based on diagonally implicit Runge Kutta (DIRK) integration in time and central weighted essentially non-oscillatory (CWENO) reconstruction in space. The numerical tests involve linear and nonlinear scalar conservation laws.

Key words: Implicit schemes, Essentially non-oscillatory schemes, Finite volumes, WENO and CWENO reconstructions

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