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Concepts for performance improvements of shallow water flow simulations
Citation key steffen_ypncongress2020
Author Steffen, L., Amann, F., & Hinkelmann, R.
Year 2020
Month 11
Note 1st IAHR Young Professionals Congress, 17-18 November 2020, online conference, reviewed extended abstract and oral presentation
Abstract Flow simulations with the depth-averaged shallow water equations are applicable to many naturally occurring surface water flows, such as open channel flow or floods. Improving the performance of simulation software allows larger simulations or lower time and energy requirements. To explore avenues for performance improvements, an open-source C++ framework for explicit finite-volume-method solvers was designed and a robust shallow water equations solver was implemented. First results show significant speedups from vectorisation of cell-based calculations, and preliminary tests show measurable speedups from reordering edge flux computations to reduce cache misses and locks between threads. Furthermore, a simple load rebalancing scheme for distributed computations is introduced and two load criteria are compared.
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