Stage-parallel fully implicit Runge–Kutta solvers for discontinuous Galerkin fluid simulations
- Brown Univ., Providence, RI (United States)
- Univ. of California, Berkeley, CA (United States)
In this paper, we develop new techniques for solving the large, coupled linear systems that arise from fully implicit Runge–Kutta methods. This method makes use of the iterative preconditioned GMRES algorithm for solving the linear systems, which has seen success for fluid flow problems and discontinuous Galerkin discretizations. By transforming the resulting linear system of equations, one can obtain a method which is much less computationally expensive than the untransformed formulation, and which compares competitively with other time-integration schemes, such as diagonally implicit Runge–Kutta (DIRK) methods. We develop and test several ILU-based preconditioners effective for these large systems. We additionally employ a parallel-in-time strategy to compute the Runge–Kutta stages simultaneously. Numerical experiments are performed on the Navier–Stokes equations using Euler vortex and 2D and 3D NACA airfoil test cases in serial and in parallel settings. In conclusion, the fully implicit Radau IIA Runge–Kutta methods compare favorably with equal-order DIRK methods in terms of accuracy, number of GMRES iterations, number of matrix–vector multiplications, and wall-clock time, for a wide range of time steps.
- Research Organization:
- Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States). National Energy Research Scientific Computing Center (NERSC); Univ. of California, Oakland, CA (United States)
- Sponsoring Organization:
- USDOE
- Grant/Contract Number:
- AC02-05CH11231
- OSTI ID:
- 1543560
- Alternate ID(s):
- OSTI ID: 1398120
- Journal Information:
- Journal of Computational Physics, Vol. 335, Issue C; ISSN 0021-9991
- Publisher:
- ElsevierCopyright Statement
- Country of Publication:
- United States
- Language:
- English
Web of Science
Evaluation of Fully Implicit Runge Kutta Schemes for Unsteady Flow Calculations
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journal | July 2017 |
Analysis and Entropy Stability of the Line-Based Discontinuous Galerkin Method
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journal | March 2019 |
Analysis and entropy stability of the line-based discontinuous Galerkin method | text | January 2018 |
Reinterpretation of Multi-Stage Methods for Stiff Systems: A Comprehensive Review on Current Perspectives and Recommendations
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journal | December 2019 |
Irksome: Automating Runge--Kutta time-stepping for finite element methods | preprint | January 2020 |
Kernel-based Active Subspaces with application to CFD parametric problems using Discontinuous Galerkin method | text | January 2020 |
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