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Scope

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.

 

Presentation

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.

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Keywords

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

 

History

TimeLineArcher

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.

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Contributers

Current major contributers are:

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

 

Publications

Thesis

Main publications

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Most recent publications

And more ...

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