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Exascale-ready adaptive mesh refinement and applications in Earth system modelling

Holke, Johannes (2021) Exascale-ready adaptive mesh refinement and applications in Earth system modelling. In: 19th Workshop on high performance computing in meteorology. 19th Workshop on high performance computing in meteorology, 20.09.2021 - 24.09.2021, Europe.

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Increasing the resolution of the computational mesh is one of the most effective tools to boost the accuracy of numerical earth system simulations and one of the current core challenges is enabling global sub-km scale simulations. However, increased mesh resolution comes at the cost of increased computational effort and memory consumption. With adaptive mesh refinement (AMR) the resolution can be dynamically controlled to use a fine resolution only when numerically necessary and keep a coarser mesh outside of regions of interest, hence reducing the required resources by orders of magnitude. Especially when the mesh refinement changes dynamically in time, efficiently managing the mesh and simulation data in parallel becomes a major challenge on its own. Modern space-filling curve (SFC) techniques are well-suited for this task due their low-memory footprint and fast scalable management algorithms. Previously, these techniques were only available for hexahedral or 2D triangular element shapes. We demonstrate the t8code library for massively scalable AMR that extends SFCs to all classic element shapes (Quadrilaterals, Triangles, Hexahedra, Tetrahedra, Prisms, Pyramids) and hence offers efficient and scalable mesh management for a wide variety of simulations. Our algorithms scale to over 1e12 mesh elements and 1 million parallel processes. In the ongoing Helmholtz incubator project Pilot Lab Exascale Earth System Modelling (PL-ExaESM) we couple t8code with the Modular Earth Submodel System framework MESSy in order to reduce the output file size of atmospheric chemistry simulations. In this talk we present our first results and discuss further plans with AMR in ESM.

Item URL in elib:https://elib.dlr.de/144163/
Document Type:Conference or Workshop Item (Speech)
Title:Exascale-ready adaptive mesh refinement and applications in Earth system modelling
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Holke, JohannesUNSPECIFIEDhttps://orcid.org/0000-0002-2783-3286UNSPECIFIED
Date:September 2021
Journal or Publication Title:19th Workshop on high performance computing in meteorology
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In ISI Web of Science:No
Keywords:Earth-system modelling, adaptive mesh, High-performance computing, t8code, AMR
Event Title:19th Workshop on high performance computing in meteorology
Event Location:Europe
Event Type:international Conference
Event Dates:20.09.2021 - 24.09.2021
Organizer:ECMWF - European Centre for Medium-Range Weather Forecasts
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Space System Technology
DLR - Research area:Raumfahrt
DLR - Program:R SY - Space System Technology
DLR - Research theme (Project):R - Tasks SISTEC
Location: Köln-Porz
Institutes and Institutions:Institute for Software Technology > High-Performance Computing
Institute for Software Technology
Deposited By: Holke, Johannes
Deposited On:04 Oct 2021 09:57
Last Modified:04 Oct 2021 09:57

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