ECOGEN_v4.0

2023-09-18

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

Major points:

• 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.
• 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. (2023). 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. (2023).
• Add Moving Reference Frame coupling of a rotating region with a static one. Also more information in: Cazé et al. (2023).
• 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.

Minor points:

• 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.

Fixes:

• 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.

ECOGEN_v3.1

2022-01-27

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

Major points:

• 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.

Minor points:

• 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.

Fixes:

• Fix recording of probes with computational restart.
• Fix bug on unstructured meshes using hexaedron and prisms.
• Correction on NASG EOS to allow null volume fractions.
• Fix bug GNU dataset output precision.
• Fix bug AMR parallel when large domains were used
• Fix bug AMR parallel on printing of load.

ECOGEN_v3.0

2021-03-10

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

• General restructuration and cleaning.
• Correction of several bugs (viscous terms, etc.).
• Additionnal reference test cases.
• Non-regression test database and tool added.

ECOGEN_v2.0

2020-05-11

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

• AMR multicore computations are now efficiently load balanced.
• New equation of state implemented: Noble-Abel Stiffened-Gas EOS.

ECOGEN_v1.0

2020-04-29

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

ECOGEN_v0.0

2017-11-27

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