YALES2 - Revision history

Moureauv: /* Extreme CFD workshop & hackathon */

2026-09-05T08:33:54Z

‎Extreme CFD workshop & hackathon

Moureauv: /* Extreme CFD workshop & hackathon */

2026-09-05T08:33:36Z

‎Extreme CFD workshop & hackathon

Moureauv: Expand Extreme CFD workshop subsection; update image to the 9th-edition logo

2026-09-05T08:31:43Z

Expand Extreme CFD workshop subsection; update image to the 9th-edition logo

Moureauv at 08:27, 5 September 2026

2026-09-05T08:27:33Z

Moureauv: Expand Key features (solvers, models, numerics, post-processing, coupling, recent releases) from the sphinx handbook and release notes

2026-09-05T07:29:46Z

Expand Key features (solvers, models, numerics, post-processing, coupling, recent releases) from the sphinx handbook and release notes

Moureauv: Refresh page: updated features/flower diagram, solver list, agile-dev stats (prepared with Claude Code, published by the page maintainer)

2026-09-05T07:18:20Z

Refresh page: updated features/flower diagram, solver list, agile-dev stats (prepared with Claude Code, published by the page maintainer)

Mendez: /* YALES2 Library and solvers */

2025-02-17T09:20:30Z

‎YALES2 Library and solvers

Moureauv at 21:15, 24 March 2024

2024-03-24T21:15:14Z

Bioche: /* Motivation */

2024-03-04T13:57:32Z

‎Motivation

Bioche: /* Motivation */

2024-03-04T13:52:56Z

‎Motivation

@@ Line 125: / Line 125: @@
 The '''Extreme CFD workshop & hackathon''' is the flagship annual event for the YALES2 community and the wider massively-parallel CFD community. Each year, about 80 researchers, engineers and PhD students from academia and industry gather for two full weeks to push HPC codes such as YALES2, AVBP, SONICS, DOROTHY, ...  onto the latest hybrid, GPU-accelerated supercomputers, through plenary sessions, a dedicated GPU-porting hackathon, and thematic workshops (combustion, dynamic mesh adaptation, multi-phase flows, numerics, turbulent flows, user experience). Much of the community-driven development highlighted above in [[#Key features|Key features]] is discussed, tested or born there — it is a major reason YALES2 keeps pace with new HPC architectures and the energy-transition challenges they target.
-The 9th edition takes place on 19-30 January 2026 at Houlgate, France.
+The 9th edition took place on 19-30 January 2026 at Houlgate, France.
 [[File:Ecfd9_logo.png | center | 700px | 9th Extreme CFD workshop & hackathon, 19-30 January 2026 - https://ecfd.coria-cfd.fr]]

@@ Line 123: / Line 123: @@
 === Extreme CFD workshop & hackathon ===
-The '''Extreme CFD workshop & hackathon''' is the flagship annual event for the YALES2 community and the wider massively-parallel CFD community. Each year, about 80 researchers, engineers and PhD students from academia and industry gather for two full weeks to push YALES2 and sister codes (such as AVBP) onto the latest hybrid, GPU-accelerated supercomputers, through plenary sessions, a dedicated GPU-porting hackathon, and thematic workshops (combustion, dynamic mesh adaptation, multi-phase flows, numerics, turbulent flows, user experience). Much of the community-driven development highlighted above in [[#Key features|Key features]] is discussed, tested or born there — it is a major reason YALES2 keeps pace with new HPC architectures and the energy-transition challenges they target.
+The '''Extreme CFD workshop & hackathon''' is the flagship annual event for the YALES2 community and the wider massively-parallel CFD community. Each year, about 80 researchers, engineers and PhD students from academia and industry gather for two full weeks to push HPC codes such as YALES2, AVBP, SONICS, DOROTHY, ...  onto the latest hybrid, GPU-accelerated supercomputers, through plenary sessions, a dedicated GPU-porting hackathon, and thematic workshops (combustion, dynamic mesh adaptation, multi-phase flows, numerics, turbulent flows, user experience). Much of the community-driven development highlighted above in [[#Key features|Key features]] is discussed, tested or born there — it is a major reason YALES2 keeps pace with new HPC architectures and the energy-transition challenges they target.
 The 9th edition takes place on 19-30 January 2026 at Houlgate, France.
 [[File:Ecfd9_logo.png | center | 700px | 9th Extreme CFD workshop & hackathon, 19-30 January 2026 - https://ecfd.coria-cfd.fr]]
 == Agile development ==

@@ Line 121: / Line 121: @@
 [[File:Commitment.jpg | center | thumb | 700px | YALES2 team commitment]]
-Here an example of event you can participate to:
+=== Extreme CFD workshop & hackathon ===
-[[File:Extreme CFD.jpg | center | thumb | 700px | Extreme CFD event, https://ecfd.coria-cfd.fr/index.php/Ecfd:ecfd_4th_edition]]
+The '''Extreme CFD workshop & hackathon''' is the flagship annual event for the YALES2 community and the wider massively-parallel CFD community. Each year, about 80 researchers, engineers and PhD students from academia and industry gather for two full weeks to push YALES2 and sister codes (such as AVBP) onto the latest hybrid, GPU-accelerated supercomputers, through plenary sessions, a dedicated GPU-porting hackathon, and thematic workshops (combustion, dynamic mesh adaptation, multi-phase flows, numerics, turbulent flows, user experience). Much of the community-driven development highlighted above in [[#Key features|Key features]] is discussed, tested or born there — it is a major reason YALES2 keeps pace with new HPC architectures and the energy-transition challenges they target.

@@ Line 6: / Line 6: @@
 </div>
-[[File:Y2_banner.png | center | 900px]]
+[[File:Y2_banner.png | center | 1200px]]
 == Motivation ==
@@ Line 58: / Line 58: @@
 [[File:Y2_modular_platform.png | center | thumb | 900px | The YALES2 modular platform: the YALES2LIB numerical core (center) and the modules built around it]]
-=== 45 solvers ===
+=== 45+ solvers ===
-Built on top of the library, YALES2 currently ships '''45 different solvers''', covering incompressible/variable-density/compressible flows, spray, ALE, multifluid, heat transfer, MHD, structural mechanics, fluid-structure interaction, phase change/boiling, biomedical flows (thrombosis, endovascular, heart, red blood cells), acoustics, and more.
+Built on top of the library, YALES2 currently ships '''45+ different solvers''', covering incompressible/variable-density/compressible flows, spray, ALE, multifluid, heat transfer, MHD, structural mechanics, fluid-structure interaction, phase change/boiling, biomedical flows (thrombosis, endovascular, heart, red blood cells), acoustics, and more. Simple solvers are first designed to validate the physics and improve the performances, and are then coupled together to target complex multi-physics flows.
 [[File:Y2_solver_list.png | center | 700px | Full YALES2 solver list]]
-</div>
-</div>
 === Turbulence, combustion & multiphysics models ===

@@ Line 24: / Line 24: @@
 == Key features ==
-YALES2 is a massively parallel, unstructured-mesh, finite-volume platform built around a shared numerical library (''YALES2LIB'') and some 45 dedicated physics solvers. Its main features are organized below by domain.
+YALES2 is a massively parallel, unstructured-mesh, finite-volume platform built around a shared numerical library (''YALES2LIB'') and some 45 dedicated physics solvers, documented end-to-end in the sphinx handbook (yales2.coria-cfd.fr, login required). Its main features are organized below by domain.
 === Core numerics & HPC infrastructure ===
 * Unstructured meshes with adaptive grid refinement, suited for massively parallel computing (tested beyond 32'000 cores)
-* Hybrid MPI/OpenMP communications with a 4-level domain decomposition
+* Hybrid MPI/OpenMP communications with a 4-level domain decomposition; OpenACC port for GPU platforms
-* Object-oriented, parallel data structures; dynamic load balancing
+* Object-oriented, parallel data structures with a pair-based connectivity shared by every solver
-* Highly efficient linear solvers for system inversion (PCG, DPCG, ...)
+* 4th-order central pair-based finite-volume method, with a dedicated high-order (least-squares) extension
-* 4th-order central pair-based finite-volume method
+* Spatial schemes library: MUSCL limiters (CHARM, OSPRE, SMART, UMIST, HCUS, HQUICK, ...), WENO, QUICK, Barth & Jespersen reconstruction
-* 4th-order time integration (hybrid Lax-Wendroff / Taylor scheme)
+* Time integration: Runge-Kutta, Lax-Wendroff, TFV4A, Crank-Nicolson and BDF, plus implicit scalar schemes (IRK, SDIRK)
-* Differential operators library, look-up table management
+* Linear solvers: PCG, DPCG, GMRES, GMRES-DR, L-GMRES, solvers on a deflation grid, and Direct/Inverse Broyden non-linear solvers
 * Parallel I/Os and automatic post-processing
-=== Mesh generation & adaptation ===
+=== Mesh generation, adaptation & load balancing ===
-* Fully parallel meshing
+* Fully parallel meshing; support for GAMBIT, XMF, HDF, AVBP, Fluent and GMSH v4 formats, with automatic element swapping
-* Automatic (isotropic and anisotropic) mesh refinement
+* Automatic isotropic and anisotropic mesh refinement, driven by Automatic Mesh Convergence (element-count or QOI-based drivers)
-* Dynamic mesh adaptation, coupled to the solvers, for moving fronts and interfaces
+* Dynamic mesh adaptation via the MMG library, coupled to the solvers for moving fronts, interfaces and periodic domains
-* Mesh management tools: boundary displacement, grid deformation, rigid body motion
+* Dynamic adaptation around tracked surfaces (YALES2BIO / RBC), with conservative interpolation types (DELEZE, CONSERVATIVE, ...)
-* Automatic boundary-layer generation
+* Mesh management tools: boundary displacement, grid deformation, rigid-body and conformal-body motion (6 DoF, contact penalization)
-=== Physical models ===
+=== Solvers — physics engines ===
-* Low-Mach number Navier-Stokes equations (incompressible and variable density)
+Every solver shares the same mesh, I/O and linear-algebra layer. Among the 45 available:
-* Turbulence models: LES (dynamic Smagorinsky, WALE, SIGMA), RANS/URANS (k-epsilon, k-omega), PANS
+* '''Flow & interface solvers''' — Incompressible (ICS), variable-density low-Mach (VDS, with spray/evaporation coupling), explicit (ECS) and semi-implicit (CPS/SIC/SII) compressible, fully-implicit steady incompressible (FII), ALE for moving meshes, spray (SPS), Volume-of-Fluid interface capturing (VFS) and VOF-based spray (VOF-SPS), multifluid (MFS), phase-change (PCS, with NIST tables), granular flow (GFS), Kazhikhov-Smagulov (KSS), Smoothed Particle Hydrodynamics (SPH)
-* Combustion modeling: tabulated or finite-rate chemistry, stiff integrators, NOx model
+* '''Heat, acoustics, EM & structures''' — Heat transfer (HTS, multi-material), radiative transfer (RDS, RTE with user-defined models), linear acoustics (ACS, Helmholtz/Newmark), electrostatics (ESS), structural mechanics (SMS, finite-element dynamics), fluid-structure interaction (FSI: FSI_ALE / FSI_SMS, Aitken relaxation, Neo-Hookean materials)
-* Two-phase flows: Lagrangian particle transport, spray and atomization (level-set / ghost-fluid method)
+* '''Particle & biomedical solvers''' — Lagrangian particle transport (LGS), deformable-membrane transport for red blood cells and beyond (RBC), Von Willebrand Factor filaments (VWF), endovascular flows (EVS), thrombosis/blood biochemistry (TBS), Force Coupling Method for rigid particles (FCM), Conservative (Lagrangian) Immersed Body solver (CLIB/CIB), heart simulations (HFS)
-* Heat & mass transfer, radiative transfer (discrete ordinates method)
+* '''Other''' — Chemical reactor (CRS), Darcy flow in porous media (DCY), cavitation (CAV), scalar transport-only solver (SCS)
-* Discrete Element Method for granular flows
-* Structural mechanics and fluid-structure interaction
-−
-=== Digital-twin & workflow tools ===
-* y2_workflow.py for the management of heavy workflows (500+ coupled simulations, e.g. for machine-learning datasets)
-* Coupling with data-analysis tools: uncertainty quantification, parameter-space exploration, topological optimization
-* Coupling with LAGUN/NEXTSTEP (https://gitlab.com/drti/lagun)
-* External coupling with third-party codes
 [[File:Y2_modular_platform.png | center | thumb | 900px | The YALES2 modular platform: the YALES2LIB numerical core (center) and the modules built around it]]
@@ Line 72: / Line 70: @@
 </div>
 </div>
 == Community ==

@@ Line 5: / Line 5: @@
 </div>
 == Motivation ==
@@ Line 14: / Line 16: @@
 More information may be found in the following presentation: [[media:yales2_course.pdf | YALES2 presentation]]
-== Community ==
+'''YALES2 objectives:'''
-YALES2 is developed by a large community with more than 500 researchers/engineers who were trained by the CORIA laboratory since 2009. The community regroups academic partners, HPC centers, industrial partners, HPC experts, SMEs and more. The code is also used for CFD training in academic courses at INSA of Rouen in the Energy and Propulsion department.
+== Key features ==
-[[File:Network.jpg | center | thumb | 700px | YALES2 network]]
+YALES2 is a massively parallel, unstructured-mesh, finite-volume platform built around a shared numerical library (''YALES2LIB'') and some 45 dedicated physics solvers. Its main features are organized below by domain.
-== Commitments ==
+=== Mesh generation & adaptation ===
-The YALES2 team is committed to supporting code users through training, meetings, projects or events.
+=== Physical models ===
-[[File:Commitment.jpg | center | thumb | 700px | YALES2 team commitment]]
+=== Digital-twin & workflow tools ===
-Here an example of event you can participate to:
+[[File:Y2_modular_platform.png | center | thumb | 900px | The YALES2 modular platform: the YALES2LIB numerical core (center) and the modules built around it]]
-[[File:Extreme CFD.jpg | center | thumb | 700px | Extreme CFD event, https://ecfd.coria-cfd.fr/index.php/Ecfd:ecfd_4th_edition]]
+=== 45 solvers ===
-== YALES2 Library and solvers ==
+[[File:Y2_solver_panel.png | center | thumb | 420px | Some of the main YALES2 solvers]]
-The numerical library YALES2LIB consists of all the numerical methods required to develop solvers:
+<div class="mw-collapsible mw-collapsed" style="width:700px">
-[[File:Library.jpg | center | thumb | 800px | YALES2 library]]
+== Community ==
-We have plenty of solvers today, here are the main ones:
+[[File:Extreme CFD.jpg | center | thumb | 700px | Extreme CFD event, https://ecfd.coria-cfd.fr/index.php/Ecfd:ecfd_4th_edition]]
 == Agile development ==
@@ Line 46: / Line 97: @@
 * programming: modular structure of the code with more than 200 objects and 420 modules
 * non-regression and testing: private gitlab forge, nightly pipelines with more than 300 automatic jobs
-* fast compiling: automatic dependencies, two pass compiling, 1m15s to compile 850'000 lines of fortran
+* fast compiling: automatic dependencies, two pass compiling
 * easy debugging: 2 compilation modes (optim, debug), many helpers (memory consumption, number of arrays, ...)
 A few figures:
-* 16 major releases since 2007
+* 20 major releases since 2007
-* 850 000 object-oriented Fortran 2008 lines for YALES2_2023.04
+* 1.2M+ object-oriented Fortran 2008 lines
-* 15 600+ commits
+* 30 000+ commits (15+ commits per day)
-* 200+ active branches
+* 300+ active branches
-* 1000+ merge requests
+* 2 000+ merge requests
-* 600+ members on the gitlab projects
+* 700+ members on the gitlab projects, 250+ active users
-* 100+ contributors
+* 120+ contributors
 == Gallery ==
 Some computation examples are given in the [[YALES2_Gallery|gallery]] and on the Youtube video channel [https://www.youtube.com/@CoriaCFD]

← Older revision		Revision as of 21:15, 24 March 2024
Line 62:		Line 62:
	== Gallery ==		== Gallery ==
	Some computation examples are given in the [[YALES2_Gallery\|gallery]] and on the Youtube video channel [https://www.youtube.com/@CoriaCFD]		Some computation examples are given in the [[YALES2_Gallery\|gallery]] and on the Youtube video channel [https://www.youtube.com/@CoriaCFD]
−
−
−	~~== Performances ==~~
−	Thanks to highly efficient linear solvers, the speed-up of YALES2 is almost linear for meshes with several billion elements. These measures up to 21 billion elements were performed at IDRIS in France and at the Juelich Supercomputing Center in Germany.
−
−	~~[[File:YALES2 2010 Scale up.png\|left\|thumb\|600px\|YALES2 scale-up on Blue Gene/P machines]]~~

@@ Line 10: / Line 10: @@
 YALES2 aims at the solving of two-phase combustion from primary atomization to pollutant prediction on massive complex meshes. It is able to handle efficiently unstructured meshes with several billions of elements, thus enabling the Direct Numerical Simulation of laboratory and semi-industrial configurations.
-YALES2 was developed from 2007 to 2010 by [[User:Moureauv|V. Moureau]] and is maintained since 2011 by [[User:Moureauv|V. Moureau]] and [[User:Lartigue|G. Lartigue]], joined later by P. Bénard and K. Bioche at CORIA and several other [[User|people]] in research laboratories.
+YALES2 was developed from 2007 to 2010 by [[User:Moureauv|V. Moureau]] and is maintained since 2011 by [[User:Moureauv|V. Moureau]] and [[User:Lartigue|G. Lartigue]], joined later by P. Bénard and [[User:Bioche|K. Bioche]] at CORIA and several other [[User|people]] in research laboratories.
 More information may be found in the following presentation: [[media:yales2_course.pdf | YALES2 presentation]]