YALES2¶

A massively parallel CFD platform solving two-phase combustion — from primary atomization to pollutant prediction — on unstructured meshes with billions of elements.

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See YALES2 in action

A few capabilities in motion — many more simulations are on our YouTube channel.

Turbulent combustion in the PRECCINSTA burner, resolved on 877 million tetrahedra — Turbulent combustion: reacting flow in the PRECCINSTA burner, resolved on 877M tetrahedra.

LES wake of a 10 MW wind turbine under yawed inflow — Wind-turbine aerodynamics: LES wake of a 10 MW turbine under yawed inflow.

Primary atomization of a liquid jet breaking up in a crossflow — Primary atomization: a liquid jet breaking up in a crossflow.

Dynamic mesh adaptation tracking a moving droplet interface.

Fluid-structure interaction: rigid versus chordwise-flexible blade wakes — Fluid–structure interaction: rigid vs. chordwise-flexible blade wakes.

Spray of droplets settling to spell out CORIA, colored by droplet diameter — Because simulating physics should still be fun.

1.4M+ Lines of Fortran 2008

45+ Dedicated physics solvers

32,000+ Parallel cores

700+ Trained researchers & engineers

23 Major releases since 2007

A platform for extreme-scale multiphysics

From incompressible aerodynamics to two-phase combustion and biomedical flows, YALES2 couples a high-order unstructured solver core with a growing family of physics modules, all running efficiently from a laptop to tens of thousands of cores.

Computational infrastructure

Unstructured meshes with adaptive refinement, hybrid MPI/OpenMP parallelism scaling to 32,000+ cores, GPU acceleration via OpenACC, and 4th-order central finite-volume schemes with high-order extensions.

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Physics solvers

45+ dedicated solvers spanning incompressible and compressible flows, two-phase sprays, heat and radiative transfer, structural mechanics and fluid–structure interaction, combustion, and biomedical flows.

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Advanced modeling

LES (Smagorinsky, WALE) and RANS turbulence closures, real-gas thermodynamics from NIST tables, atmospheric boundary layers, and porous-media flows.

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A living community

Developed at CORIA since 2007, with contributions from industrial partners and an annual Extreme CFD workshop bringing together about 100 researchers, engineers and PhD students.

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Recent results

A sample of 2025–2026 simulations run with YALES2, from combustion and fire safety to primary atomization and phase change.

Primary atomization of a liquid jet in crossflow with adaptive mesh and Lagrangian spray — Primary atomization of a liquid jet in crossflow: adaptive mesh (grey) coupled to a Lagrangian spray beyond breakup (colored droplets).

Thermodiffusive instabilities on a hydrogen/air flame front, in a side-wall quenching configuration.

Film boiling above a heated wall with adaptive mesh around the interface — Film boiling above a heated wall: temperature field and the dynamically adapted mesh tracking the liquid/vapor interface.

Sloshing-tank benchmark liquid sheet impact and temperature field — Sloshing-tank benchmark (Himeno et al.): liquid-sheet impact and the resulting temperature field, used to validate two-phase heat-transfer modeling.

Where to go next

Whether you want to read the science, browse the code, or join the community.

Documentation

Tutorials, input-file reference and developer guides live on the project documentation site.

yales2.coria-cfd.fr
Source code

YALES2 is developed in the open on our self-hosted GitLab forge.

gitlab.coria-cfd.fr
Getting access

YALES2 is distributed under a lightweight registration process. See how to request access.

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