A framework for high-order fluid flow simulations

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Runs on your hardware

Built with native CPUs, CUDA, HIP, and OpenCL kernels.
Exceptional performance and parallel scaling.
Device-abstraction layer to facilitate portable code development.

High-order discretization

Based on the spectral element method.
User-selectable polynomial basis order.
Hexahedral unstructured grids.

Research ready

Incompressible flow simulation with arbitrary number of additional scalars.
Large-eddy simulation and wall modelling.
Temporal statistics, forces, point probes, and other quality-of-life features.

Latest News

05 Dec 2025 Neko v1.0.0

This is a major release introducing several significant changes in terms of features and functionalities, user interaction, and code improvements.

12 Nov 2024 Neko v0.9.0

The Neko dev team is pleased to announce that Neko v0.9.0 has been released 😺! This is a major release, adding several new features and fixes sever...

07 Jul 2024 Neko v0.8.0

The Neko dev team is pleased to announce that Neko v0.8.0 has been released 😺! This is a major update in terms of features, user interaction, and i...

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Use Cases

von Karman turbulent boundary layer

A direct numerical simulation of the passive scalar evolution in the von Karman turbulent boundary layer induced by a rotating disk, highlighting near-wall streaks and the larger spiral organization that emerges farther from the wall.

Flat plate turbulent boundary layer

A canonical flat-plate turbulent boundary layer visualization, showing the developing vortical structures.

Turbulent flow in a rough pipe

Rough-pipe flow at friction Reynolds number 2000. The image shows slices of streamwise velocity.

The Flettner rotor

A simulation of the Flettner rotor, a device that leverages the Magnus effect to generate propulsion.

Shear-convective atmospheric boundary layer

Slices showing coherent temperature structures in a shear-convective atmospheric boundary layer. A large-eddy simulation with the buoyancy-corrected Vreman model.

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Publications

2026

Du, S., Münsch, M., Jansson, N., Schlatter, P. “Assessment of the gradient jump penalisation in large-eddy simulations of turbulence.” Acta Mechanica. DOI.

2026

Ohm P., Harper G., and Jansson N. “A Matrix-Free Algebraic hp-Multigrid Method for Computational Fluid Dynamics Applications.” Proceedings of the Supercomputing Asia and International Conference on High Performance Computing in Asia Pacific Region (SCA/HPCAsia '26). DOI.

2026

Stanly, R., Bagheri, E., Mukha, T., Schlatter, P. “Influence of turbulence inflow conditions on aeroacoustics of wall-bounded flows.” International Journal of Heat and Fluid Flow, 118, 110216. DOI.

2025

Baconnet, V., Karp, M., Hanifi, A., Lengani, D., Simoni, D., & Henningson, D.S. “Investigation of the Dynamics of Secondary Flow Vortex Systems in Low-Pressure Turbines Using Direct Numerical Simulation.” Proceedings of the ASME Turbo Expo 2025: Turbomachinery Technical Conference and Exposition. Volume 12. Memphis, Tennessee, USA. June 16-20, 2025. V012T36A005. ASME. DOI.

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The development of Neko was supported by the European Commission Horizon 2020 project grant EPiGRAM-HS: Exascale Programming Models for Heterogeneous Systems (grant reference 801039), the European High Performance Computing Joint Undertaking (JU) and Sweden, Germany, Spain, Greece and Denmark under grant "CEEC - Centre of Excellence for Exascale CFD" (grant agreement No 101093393), the Swedish Research Council project grant Efficient Algorithms for Exascale Computational Fluid Dynamics (grant reference 2019-04723) and the SeRC Exascale Simulation Software Initiative (SESSI).

The Neko logo was designed by Robert Hansen Jagrelius.

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