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Content
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2. Success story: Enabling GPUs for Energy-Efficient Aerodynamics Simulations of an Aircraft
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3. Blog article: Explaining Scientific Code, Assisted by Large Language Models
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4. Blog article: EXCELLERAT at SLING Days 2025
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1. Welcome
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Welcome to the 31st issue of the EXCELLERAT newsletter – and to our very first issue of 2026. As we enter the final year of the EXCELLERAT P2 project, we are looking ahead with confidence and motivation, building on the strong technical foundations and community we have developed together.
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We have kicked off the year with our first event contribution at HiPEAC 2026, where we once again engaged with the European HPC and systems community. The coming months promise more opportunities for exchange: we are already preparing for the EuroHPC Summit in March, Hannover Messe in April, and many others!
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This issue particularly highlights a success story by Barcelona Supercomputing Center, focussing on GPU acceleration, and new technical insights on using large language models to support scientific code understanding by CERFACS.
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Best regards,
Bastian Koller
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EXCELLERAT P2 Project Coordinator
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2. Success story: Enabling GPUs for Energy-Efficient Aerodynamics Simulations of an Aircraft
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Researchers at the Barcelona Supercomputing Center demonstrated how GPU acceleration can significantly improve the performance and energy efficiency of large-scale aircraft aerodynamics simulations. By porting the Alya and Sod2D solvers to GPUs using OpenACC, the team achieved up to a 20× speed-up while consuming 10–12× less energy compared to CPU-based runs on MareNostrum V. The approach enables high-fidelity turbulence resolution at lower cost and reduced carbon footprint, with applications beyond aeronautics, including wind energy, climate modelling, and automotive aerodynamics.
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3. Blog article: Explaining Scientific Code, Assisted by Large Language Models
Explaining large and complex scientific codebases remains a time-consuming task. While large language models can help with small snippets, this approach does not scale well to full repositories. In a recent blog article, EXCELLERAT partner CERFACS introduces WalkingPrompt, a workflow that systematically traverses a codebase and generates structured, repository-level summaries with the help of language models. This results in more consistent explanations and a coherent first layer of documentation, while keeping human developers in control. The article also discusses key aspects such as reliability, privacy, and local deployment in HPC environments.
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4. Blog article: EXCELLERAT at SLING Days 2025
The SLING Days 2025, Slovenia’s flagship event for high-performance computing and artificial intelligence, took place from 19–21 November in Ljubljana, bringing together more than 700 participants in a hybrid format. EXCELLERAT P2 was featured through expert discussions and promotional activities alongside European HPC competence centres and initiatives. Project partners Arctur and UL-LECAD presented key simulation and engineering codes developed within EXCELLERAT and highlighted the EXCELLERAT Service Portal, reinforcing the project’s role in supporting industry-ready HPC solutions.
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5. Further News & Events
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Join the EXCELLERAT Community – Free of Charge: As an Interest Group Member, you will receive expert support, early access to innovations, and opportunities to showcase your work through the EXCELLERAT platform and events. Register now
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EuroHPC Summit 2026 | 10–12 March 2026 | Paphos, Cyprus
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EXCELLERAT P2 partners will participate in the EuroHPC Summit 2026, contributing to the poster session and presenting the services offered by the EXCELLERAT Centre of Excellence. The event brings together key stakeholders from European high-performance computing, quantum computing, and artificial intelligence to discuss recent developments and future opportunities. More information
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Aerospace & Aeronautics Survey: Help Shape Future HPC and AI Workflows
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EXCELLERAT is designing next-generation, high-fidelity, AI-enabled simulation workflows for aerospace engineering. We invite you to share your insights on current practices, challenges, and priority use cases. 5-minute survey (anonymous if preferred)
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Energy Sector Survey: Shape the Future of AI-Driven Simulation
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As EXCELLERAT enters its final project year and prepares for a potential next funding phase, we invite energy-sector stakeholders to share their perspectives on simulation workflows, challenges, and priorities. 5-minute survey (anonymous if preferred)
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Funded by the European Union. This work has received funding from the European High Performance Computing Joint Undertaking (JU) and Germany, Italy, Slovenia, Spain, Sweden, and France under grant agreement No 101092621.
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High-Performance Computing Center Stuttgart (HLRS) | Nobelstrasse 19
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70569 Stuttgart | Germany
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