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ARCHER is a High-Performance-Computing code developed at the CORIA laboratory. It stands for Academic Research Code for Hydrodynamic Equations Resolution. It also takes its name from the fish, the Archerfish (Toxotidae), known for preying insects by spitting a jet of water.

Archer is aimed at carrying Direct Numerical Simulations of two-phase flows may they be turbulent, incompressible or compressible, with phase change or in presence of solid boundaries. Data from Archer are used for probing the physical properties (either geometrical, morphological, topological, or dynamical) of different phenomena such as atomization, spray formation, dispersion, evaporation, phase separation, capture of solid aerosols. The close connection of the Archer developers with experimentalist is further noticeable. This wide knowledge serves for building or reinforcing physics-informed models, notably the Eulerian Lagragian Spray Atomization model (ELSA).

It was one of the first code worldwide, undertaking the simulation of liquid-jet atomization under a realistic injection configuration.



ARCHER solves on a staggered Cartesian mesh the one-fluid formulation of the incompressible Navier-Stokes equation. In this objective, the convective term is written in conservative form and solved using an improved Rudman’s technique. The latter allows mass and momentum to be transported in a consistent manner thereby enabling flows with large liquid/gas density ratios to be simulated accurately. To ensure incompressibility of the velocity field, a Poisson equation is solved. The latter accounts for the surface tension force and is solved using a MultiGrid preconditioned Conjugate Gradient algorithm (MGCG) coupled with a Ghost-Fluid method.

For transporting the interface, use is made of a coupled level-set and volume-of-fluid (CLSVOF) solver, in which the level-set function accurately describes the geometric features of the interface (its normal and curvature) and the volume-of-fluid function ensures mass conservation. The density is calculated from the volume-of-fluid. The dynamic viscosity depends on the sign of the level-set function. In cells containing both a liquid and gas phase, a specific treatment is performed to evaluate the dynamic viscosity.

Current work is targeting compressible flow, evaporation, lagrangian particles.

ARCHER is written in Fortran+MPI and PyArcher is a Python (Dask+Xarray) library written to pre/post process data for ARCHER.



CLSMOF Level set method Coalescence Écoulements diphasiques Multiscale High speed flows Homogeneous isotropic turbulence 76A99 Chaos COMBUSTION CHAMBERS Liquid-liquid flow Injection Imbibition Frontières immergées IBM Evaporation Atomisation Gauss- Bonnet formula 53A17 Simulation numérique directe Direct numerical simulation DIPHASIQUE Coaxial liquid jet Curvature Disperse/separated phases Multiphase flow Fluid mechanics Experimental analysis Turbulence Mass conservation Curvatures Dynamics analysis Deformation Droplets Diffuse interface models Vaporization Image processing Incompressible flow Modeling Capillary instability Transformation Criteria DNS Center of mass CLSVOF Compressible Ligne triple Liquid Films Modélisation Atomisation primaire Two-phase flow Fraction volumique ELSA model Films liquides 35Q35 Gas-liquid interface MOF Drop size distribution Diffuse interface Immiscible two-phase flow Suivi d'interface Interface tracking Flow visualization Geometrical INTERFACE DIFFUSE Ghost fluid Multi-scale analysis Microchannel Drops Diphasique LES Gouttes Jet in crossflow JICF Immuno-evasion Centre de masse Benchmark Computational geometry Jet atomization Large Density Ratio Interface capture Moments method Atomization Airblast 65D99 Interface statistics Computational fluid dynamics Fiber medium Gas kinetic scheme Double-pulsed femtosecond laser system Altitude relight Contact angle Air assisted atomization MODELE REDUIT Diesel spray Interface capturing models Interface Fragmentation Cellular interactions Collision Immersed boundary method IBM Angle de contact Level set




The Archer project took shape in 2001 thanks to the impulsion of Alain Berlemont who supervised the first two PhDs (S. Tanguy 2001-2004, T. Ménard 2003-2007), sparking the first developments of the code. Since then, 11 PhD students, 7 post-doctorates and many Master students have contributed to its progress. It now constitutes a compulsory tool for many researchers of the CORIA laboratory (A. Berlemont, T. Ménard, P. Desjonqueres, J. Cousin, F-X. Demoulin, J. Reveillon, B. Duret, A. Poux, J.C.B. de Motta, F. Thiesset, C. Dumouchel) and is involved in many projects funded by either national (ANR) or international (Marie-Curie ITN) agencies.

The chart on the left retraces the main steps of the Archer project.





Current major contributers are:

  • Thibaut Ménard (code leader)
  • Benjamin Duret (compressible)
  • Jorge-César Brandle de Motta (lagrangian)
  • Alexandre Poux (numerics)





Main publications


Most recent publications

And more ...