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Grant awarded: Scientific exchange with NPS on GPU-accelerated weather simulations

Valentin Churavy has successfully applied for a travel grant at the Bavaria California Technology Center (BaCaTec,? https://bacatec.de).?Over the next two years, we will collaborate with Frank Giraldo and Lucas Wilcox?at the Navel Postgraduate School in Monterey, California. A multi-week visit of Valentin to California is planned for 2025, which will be reciprocated by scientist from NPS in 2026. Congratulations Valentin!

Abstract

Predictive modeling of extreme weather events is a key tool for addressing the impacts of climate change at both regional and global scales. Regions like California and Bavaria face immense challenges from the increasing frequency of such events. By employing predictive simulation methods, regional and municipal authorities can better plan and appropriately scale climate-resilient infrastructure. However, large-scale, high-fidelity numerical simulations are extremely computationally demanding and require advanced computational and mathematical methods for efficient prediction of regional climate impacts. To meet this need, our project will work towards extending the Julia-based simulation framework Trixi.jl to simulate local extreme weather events with solution-adaptive algorithms for GPU-based supercomputers. In addition, integrating machine learning and automatic differentiation will facilitate sensitivity analyses and enable more sophisticated surrogate modeling.?

Using p4est meshes for our simulations we implemented flexible multiphysics coupling across interface boundaries in Trixi.jl. Unlike structured meshes, p4est meshes can be much more flexible. They do not require to be rectangular or even simply connected. As a test case we show here two meshes. One writes the word "Trixi.jl" and the other is its complement. We couple an MHD system with an Euler system and initialize the domain with a linear pressure wave that travels to the left.
mhd_euler_t0
Coupled Euler-Mhd system using two p4est meshes. Shown is the gas density at time t = 0. ? 伟德国际_伟德国际1946$娱乐app游戏 of Augsburg
mhd_euler_t34
Coupled Euler-Mhd system using two p4est meshes. Shown is the gas density at time t = 34. ? 伟德国际_伟德国际1946$娱乐app游戏 of Augsburg

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