Journal
ENVIRONMENTAL MODELLING & SOFTWARE
Volume 141, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.envsoft.2021.105034
Keywords
2D flood model; Open source; Multi-GPU; High-resolution; Shallow water equations
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Funding
- US Air Force Numerical Weather Modeling Program
- US Department of Energy [DE-AC05-00OR22725]
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This work presents a new open source multi-GPU 2D flood model called TRITON, which is first order accurate, robust, and effectively utilizes heterogeneous architectures, showing promising runtimes.
A new open source multi-GPU 2D flood model called TRITON is presented in this work. The model solves the 2D shallow water equations with source terms using a time-explicit first order upwind scheme based on an Augmented Roe's solver that incorporates a careful estimation of bed strengths and a local implicit formulation of friction terms. The scheme is demonstrated to be first order accurate, robust and able to solve for flows under various conditions. TRITON is implemented such that the model effectively utilizes heterogeneous architectures, from single to multiple CPUs and GPUs. Different test cases are shown to illustrate the capabilities and performance of the model, showing promising runtimes for large spatial and temporal scales when leveraging the computer power of GPUs. Under this hardware configuration, communication and input/output subroutines may impact the scalability. The code is developed under an open source license and can be freely downloaded in https ://code.ornl.gov/hydro/triton.
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