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Enabling dynamic adaptive mesh refinement (in MESSy) using t8code

Holke, Johannes (2021) Enabling dynamic adaptive mesh refinement (in MESSy) using t8code. In: 10th EMAC Symposium. 10th EMAC Symposium, 31.05.2021 - 02.06.2021, Online.

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Abstract

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 t8code and MESSy.

Item URL in elib:https://elib.dlr.de/146910/
Document Type:Conference or Workshop Item (Speech, Poster)
Title:Enabling dynamic adaptive mesh refinement (in MESSy) using t8code
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Holke, JohannesJohannes.Holke (at) dlr.dehttps://orcid.org/0000-0002-2783-3286
Date:31 May 2021
Journal or Publication Title:10th EMAC Symposium
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Published
Keywords:Earth-system modelling, adaptive mesh, High-performance computing, t8code, AMR, MESSy
Event Title:10th EMAC Symposium
Event Location:Online
Event Type:Workshop
Event Dates:31.05.2021 - 02.06.2021
Organizer:The MESSy consortium
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:08 Dec 2021 11:52
Last Modified:08 Dec 2021 11:52

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