Releases

ECOGEN_v5.0

2025-09-30

A new release, ECOGEN_v5.0, is available on GitHub. It includes new features and fixes bugs.

Possibility to use second-order numerical scheme on unstructured meshes. Although still in beta.
Acoustic waves can now be modelled through source terms (sinusoidal or Gaussian pulses). This follows the work of Maeda & Colonius (2017) for single-phase flows and has been extended here for multiphase systems of equations.
For developers: Improvement of the CI now including code coverage, clang-formatting, better artefact management, use of address sanitizer and pre-commit.
Clang-format applied to the whole code.

Gnuplot scripts added for pdf generation of results with GNU output format
Add velocity in x-direction to the 1D output using Gnuplot.
Correction of translation: restart -> resume.
The CFL length estimation has been improved for quadrangle elements.
Possibility to add record frequency for cuts.
Correction of memory errors (deallocations).
Possibility to compile the code using `cmake` instead of `makefile` (for advanced users).
Update of documentation and test cases, as usual.
Use `VTK` key instead of `XML` one for `outputMode` tag of `main.xml` file.
Modify the deepness of all 1D and 2D test cases to unity. This was made to avoid possible issues during the visualisation of the results with tools such as Paraview.

Update names of manuals to be coherent with input files from the test cases.
Update Cv from air EOS.
Fix bug and variables names update on `ModUEq::solveRIemannInletInjTemp`.
Fix EOS assignment in boundary conditions and add that the EOS key must be present in `dataFluid` tag of boundary conditions (must be consistent with model EOS).
Fix `Euler` test cases missing EOS key in `dataFluid` tag of boundary conditions.
Fix memory errors during termination of the execution when EOS is missing.
Fix unstructured-mesh file parsing using msh v4 format (working now, although only for serial simulations).
Fix wrong elapsed time from simulations (was using CPU time, now uses wall time).

2023-09-18

A new release, ECOGEN_v4.0, is available on GitHub. It includes new features and fixes bugs.

Removed the version numbers of the input file names (break compatibility with previous version).
Possibility to use finite pressure relaxation on UEq model for more than two phases. More information in: Schmidmayer et al. (2023)
Possibility to initialize an unstructured simulation with the result of a previous simulation performed on a similar mesh and/or a different number of CPUs. This feature is particularly useful to fasten steady state convergence on a fine mesh using coarse mesh results. More information in: Cazé et al. (2024). Modelling and simulation of the cavitation phenomenon in space-engine turbopumps.
PUEq phase-change model (handled through PTMu relaxation) does not require mass fraction threshold anymore to trigger mass transfer. Also more information in: Cazé et al. (2024).
Add Moving Reference Frame coupling of a rotating region with a static one. Also more information in: Cazé et al. (2024).
Renamed boundary condition names (break compatibility with previous version).
Immersed boundaries can be added in a Cartesian mesh domain (physicalEntity = -1). Similarly to: Trummler et al.

Option to record boundary quantities such as pressure forces and shear stress (useful for aerodynamic coefficient computation).
Possibility to display cells' reference length on XML output with unstructured mesh.
Add a tutorial on mesh mapping and low-Mach preconditionning options.
Add scripts related to droplet shock-induced cavitation. More information in: Biasiori-Poulanges & Schmidmayer (2023) and Schmidmayer & Biasiori-Poulanges (2023).
Improve variable name style for Gnuplot output.
Increase code coverage by nonreg.
Updated AMR refinement criteria to match the different modelling.
Always a little more source code translation from French to English.
A wall is now considered as a symmetry BC if viscosity is ignored.
Update of documentation.

Fix the getTemperature() and copyPhase() methods for multiphase models.
Fix restart bug when using alphaNull on PUEq model.
Fix bug on simulation progress when using iteration control mode.
Fix a MPI data type that caused a crash during MPI_Allreduce on some compilers.
Minor fix for Euler-Korteweg model.
Correction on UEq BC for volume fraction flux, using sM instead of uStar to respect transport equation.
Update non-regression scripts to make them compatible with OS X.
Correction for phase change with a second-order method.

2022-01-27

ECOGEN_v3.1 is available on GitHub. It includes new features and fixes bugs.

Add velocity-equilibrium model. Read the following paper for more information: K. Schmidmayer, J. Cazé, F. Petitpas, E. Daniel, N. Favrie. "Modelling interactions between waves and diffused interfaces". 2021.
Add velocity-equilibrium model based on total-energy equations. Read the previous paper for more information.
Possibility to use another gradient method (Green-Gauss) which is compatible with unstructured meshes. Previously, finite differences were the only available.
Possibility to use low-Mach preconditioning technique for Euler & pressure-velocity-equilibrium models.
Option to use 1D with smooth cross-section-variation scheme (useful for nozzles).
Add models augmented Euler-Korteweg and defocusing non-linear Schrödinger as well as Van der Waals equation of state. Mainly experimental work.

Possibility to reduce output variable number for UEq and PUEq models.
Restarting computation possible for all models for XML format output.
Possibility to record flux on boundary (massflow, total enthalpy) and/or flow quantities (density, pressure, velocity) in agreement with Moving Reference Frame method.
Possibility to set precision for specific outputs (probes, cuts, global quantities, boundary flux/quantities).
Possibility to run test cases from a different folder.
Minor modification of axi-symmetric computations for second-order simulations.
Better handling of pressure relaxations when Newton-Raphson method does not converge.
Update of documentation regarding test cases.

2021-03-10

ECOGEN_v3.0 is available on GitHub. It includes new features and fixes bugs:

2020-05-11

ECOGEN_v2.0 is available on GitHub. It includes new features and fixes bugs:

2020-04-29

ECOGEN_v1.0 is available on GitHub. It includes new features and fixes bugs.

2017-11-27

First version of ECOGEN, ECOGEN_v0.0, available on GitHub.