Communications on Applied Mathematics and Computation ›› 2022, Vol. 4 ›› Issue (4): 1191-1228.doi: 10.1007/s42967-021-00159-w

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Optimized Runge-Kutta Methods with Automatic Step Size Control for Compressible Computational Fluid Dynamics

Hendrik Ranocha1, Lisandro Dalcin2, Matteo Parsani2, David I. Ketcheson3   

  1. 1. Applied Mathematics Münster, University of Münster, Münster, Germany;
    2. Computer Electrical and Mathematical Science and Engineering Division (CEMSE), Extreme Computing Research Center (ECRC), King Abdullah University of Science and Technology (KAUST), Thuwal, 23955-6900, Saudi Arabia;
    3. Computer Electrical and Mathematical Science and Engineering Division (CEMSE), King Abdullah University of Science and Technology (KAUST), Thuwal, 23955-6900, Saudi Arabia
  • Received:2021-04-14 Revised:2021-07-21 Online:2022-12-20 Published:2022-09-26
  • Supported by:
    Research reported in this publication was supported by the King Abdullah University of Science and Technology (KAUST). We are thankful for the computing resources of the Supercomputing Laboratory and the Extreme Computing Research Center at KAUST. Funded by the Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) under Germany's Excellence Strategy EXC 2044-390685587, Mathematics Münster:Dynamics-Geometry-Structure. Special thanks are extended to the McLaren F1 racing Team for providing data, CAD geometries, and setup of the Imperial Front Wing test case.

Abstract: We develop error-control based time integration algorithms for compressible fluid dynamics (CFD) applications and show that they are efficient and robust in both the accuracy-limited and stability-limited regime. Focusing on discontinuous spectral element semidiscretizations, we design new controllers for existing methods and for some new embedded Runge-Kutta pairs. We demonstrate the importance of choosing adequate controller parameters and provide a means to obtain these in practice. We compare a wide range of error-control-based methods, along with the common approach in which step size control is based on the Courant-Friedrichs-Lewy (CFL) number. The optimized methods give improved performance and naturally adopt a step size close to the maximum stable CFL number at loose tolerances, while additionally providing control of the temporal error at tighter tolerances. The numerical examples include challenging industrial CFD applications.

Key words: Explicit Runge-Kutta methods, Step size control, Compressible Euler equations, Compressible Navier-Stokes equations, hp-adaptive spatial discretizations

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