Center of Excellence in Exascale CFD (CEEC)

📍 CEEC at #SIAMPP26 | Berlin
🔬 GALAEXI: Architecture-agnostic GPU acceleration for legacy Fortran CFD
🗓️ Mar 3, 18:25–18:50
Join Spencer Starr on practical CUDA/HIP porting, CPU/GPU support, MPI, and performance portability.
ceec-coe.eu/event/galaex...
#HPC #Fortran #CFD

Performance Portability for Fortran Software – Experience from GALÆXI – CEEC CoE —

🎯 New year, new skills: performance portability for Fortran on GPUs
Watch the CEEC webinar on adapting the CFD solver GALÆXI for CPUs & GPUs, covering GPU basics, Fortran + CUDA/HIP, and verification at scale.
👉 ceec-coe.eu/2025/12/11/p...
#HPC #Fortran #GPUComputing #CFD

🎯 New year, new skills: performance portability for Fortran on GPUs
Watch the CEEC webinar on adapting the CFD solver GALÆXI for CPUs & GPUs, covering GPU basics, Fortran + CUDA/HIP, and verification at scale.
👉 ceec-coe.eu/2025/12/11/p...
#HPC #Fortran #CFD

A Matrix-Free Algebraic hp-Multigrid Method for Computational Fluid Dynamics Applications – CEEC CoE « All Events

📍 CEEC at SCA / #HPCAsia2026 — Talk 2
🔬 A Matrix-Free Algebraic hp-Multigrid Method for Computational Fluid Dynamics Applications
🏆 Best Paper Finalist
📅 January 28 | ⏰ 12:00–12:30
📍 Osaka, Japan | SCA / HPCAsia 2026

Task-decomposed Overlapped Preconditioner for Sustained Strong Scalability on Accelerated Exascale Systems – CEEC CoE « All Events

📍 CEEC at #HPCAsia2026 — Talk 1
🔬 Task-decomposed Overlapped Preconditioner for Sustained Strong Scalability on Accelerated Exascale Systems
📅 January 28 | ⏰ 11:30–12:00
📍 Osaka, Japan | SCA / HPCAsia 2026

The 12 Days of CEEC-ness – CEEC CoE —

Thank you for the last year and we'll see you in the new one! 🎉
ceec-coe.eu/2024/12/23/t...

🌲 We hope you've enjoyed our 12 Days of CEEC-ness parody and wish you a warm and relaxing holiday season! ❄️

🎤 The full lyrics to our song are in our last year's blog post, if you feel like starting a new sing-along tradition!

Merchant Ship Hull – CEEC CoE In contrast to aerospace, the marine industry lags behind in using high-fidelity simulations for design. Moreover, large vessels are a particularly challenging computational problem because they…

ceec-coe.eu/merchant-shi...

🎶...Nek code improvements, Atmo boundary models, Coupled waLBerla, Wind turbines eroding, Better Neko meshing, Fast static mixers, New SOD2D flows! solid Alya code, Plane wings that bend, FLEXI transonic flows, and an airplane that wants to fly free.🎶

Merchant Ship Hull – CEEC CoE In contrast to aerospace, the marine industry lags behind in using high-fidelity simulations for design. Moreover, large vessels are a particularly challenging computational problem because they…

🎶On the twelfth day of CEEC-ness, my true love gave to me,
Merchant ships a-simming...🎶

Unlike #aerospace, #Maritime doesn't commonly use high-fidelity #CFD simulations for design. CEEC will capitalize on new, larger #HPC systems to start catching up on simulations for ship modeling.

🎶...Atmo boundary models, Coupled waLBerla, Wind turbines eroding, Better Neko meshing, Fast static mixers, New SOD2D flows! solid Alya code, Plane wings that bend, FLEXI transonic flows, and an airplane that wants to fly free.🎶

IN CEEC, we'll be both porting Nek to new hardware, such as for the Jupiter system from the @fz-juelich.de, as well as improving its large eddy simulations and wall modelling.
ceec-coe.eu/nek5000-nekrs/

Nek5000-NekRS – CEEC CoE Nek5000 and NekRS are highly-efficient and scalable open source incompressible and low Mach flow solvers employing the spectral element method (SEM), a high-order weighted residual technique for…

🎶on the eleventh day of CEEC-ness, my true love gave to me,
Nek code improvements...🎶

Nek has been around for decades, but hardware keeps evolving, which means Nek must too.

🎶...Coupled waLBerla, Wind turbines eroding, Better Neko meshing, Fast static mixers, New SOD2D flows! solid Alya code, Plane wings that bend, FLEXI transonic flows, and an airplane that wants to fly free.🎶

Atmospheric Boundary Layer flows – CEEC CoE In addition to vertically exchanging moisture and aerosols in the atmosphere, Atmospheric boundary layer (ABL) flows affect transportation, renewable power generation (wind and solar), pollutant…

... in size or detail given that atmosphere covers our entire planet. In CEEC, we're pushing the state of the art in this field to make more accurate, larger simulations possible, even on the newest generation of European supercomputers.
ceec-coe.eu/atmospheric-...

Atmospheric Boundary Layer flows – CEEC CoE In addition to vertically exchanging moisture and aerosols in the atmosphere, Atmospheric boundary layer (ABL) flows affect transportation, renewable power generation (wind and solar), pollutant…

🎶On the tenth day of CEEC-ness, my true love gave to me,
Atmo boundary models...🎶

Understanding or someday predicting our atmosphere has implications for solar energy, wind energy, urban modeling, and weather prediction (of course). These kinds of simulations have no upper limit ...

🎶...Wind turbines eroding, Better Neko meshing, Fast static mixers, New SOD2D flows! solid Alya code, Plane wings that bend, FLEXI transonic flows, and an airplane that wants to fly free.🎶

For the lighthouse case where we’re using waLBerla, we’re simulating coupled micro erosion fluid flow and particle flow. In CEEC, we're therefore improving the performance of this coupled fluid – particle flow simulation.
ceec-coe.eu/walberla/

waLBerla – CEEC CoE waLBerla is a modern open source multi-physics simulation software framework with a focus on CFD applications. The main unique feature of waLBerla is its uncompromising focus on large-scale…

🎶On the ninth day of CEEC-ness, my true love gave to me,
Coupled waLBerla...🎶

waLBerla uses the lattice Boltzmann method to simulate flow, unlike all the other CEEC codes that solve the Navier-Stokes equations.

🎶...Better Neko meshing, Fast static mixers, New SOD2D flows! solid Alya code, Plane wings that bend, FLEXI transonic flows, and an airplane that wants to fly free.

Erosion and micro erosion can cause suction pylon installation to fail, though. So, we’re building a simulation of this erosion to understand how to make suction installation more successful.
ceec-coe.eu/localized-er...

Localized erosion – CEEC CoE Suction foundations for offshore wind turbines can have a significant risk of erosive failure. Nevertheless, this type of marine foundation is gaining growing relevance as an environmentally friendly…

🎶On the eighth day of CEEC-ness, my true love gave to me,
Wind turbines eroding...🎶

Off-shore wind energy has great potential but also environmental impacts. One solution is suction mounting the turbine pylons, which is much quieter.

🎶...Fast static mixers, New SOD2D flows! solid Alya code, Plane wings that bend, FLEXI transonic flows, and an airplane that wants to fly free.🎶

That said, it could be better at building meshes for complex geometries. That's one of the things we're working on improving to enable the two lighthouse cases where we're using #Neko - yesterday's static mixers as well as day 12 of this song parody being published next Friday.
ceec-coe.eu/neko/

Neko – CEEC CoE Neko is a portable framework for high-order spectral element based simulations, focusing on the incompressible regime. The framework is written in modern Fortran and adopts an object-oriented…

🎶On the seventh day of CEEC-ness, my true love gave to me,
Better Neko meshing…🎶

#Neko is incredibly fast and paralel as well as easy to use across hardware architectures, with it's abstraction layer that takes care of choosing the correct kernal for the system.

🎶...New SOD2D flows! solid Alya code, Plane wings that bend, FLEXI transonic flows, and an airplane that wants to fly free.🎶

However, finding the best balance between speed of flow and thoroughness mixing is difficult. We're teaching #Neko to simulate this optimal topology!
ceec-coe.eu/topology-opt...

Topology Optimization – CEEC CoE Static mixers, a part of a pipe in which the incoming fluid streams are mixed by the internal pipe geometry while decreasing pressure as little as possible, have been used since the 1970s for…

🎶On the sixth day of CEEC-ness, my true love gave to me,
Fast static mixers...🎶

Static mixers, tubes whose internal topology mixes fluids without any moving parts,are therefore low maintenance and cost effective for many industries spanning medicine to food.

🎶...solid Alya code, Plane wings that bend, FLEXI transonic flows, and an airplane that wants to fly free. 🎶

We're scaling and speeding up SOD2D while making it couple with Alya for solid mechanics simulations - a technical challenge full of unknown unknowns.
ceec-coe.eu/sod2d/

SOD2D – CEEC CoE Sod2 implements a numerical solution for the equations governing compressible and incompressible fluid flow in three dimensions. The code is based on the spectral element method (SEM) and is designed…

🎶On the fifth day of CEEC-ness, my true love gave to me,
New SOD2D flows!🎶

The newest of the CEEC codes is SOD2D, also from @bsc-cns.bsky.social. SOD2D is the only other code in CEEC aside from FLEXI that can simulate fluid flows at high speeds, so called compressible flows.