Production version 3.0

Click here to dowload a 3.0.4 version with the installer.

Version 3.0, released in March 2013, is a "long-term support" version, and the 3.0 branch has undergone a full validation process. We recommend users still using version 2.0 to switch to version 3.0. The documentation has been updated.

The current bug-fix release is 3.0.4. It was released May 16, 2014.

As with any version, in case you detect bugs, we appreciate your feedback on the forum and bug-tracker, which will help us to provide you with patch releases for this stable series, as well as improvements for future developement versions.

Reminder: current Code_Saturne developpment cycles are based on a release approximately every 6 months, including a fully validated, "long-term support" version every 2 years.
Version 3.1 was first released in May 2013, 3.2 December 2013, and 3.3 May 2014, shifting the release cycle by a few months to synchronize with the SALOME platform, so 4.0 should be released early 2015.


The main improvements provided by Code_Saturne 3.0 as compared to the previous version (namely 2.0) are the following:

Physical modelling:

  • Lagrangian particles tracking

    • New deposition model

  • Combustion

    • New unified model for coal and fuel combustion for the gas phase

  • Fire

    • New dilatable model for fire modelling (idilat = 4)

  • Compressible

    • New Low-Mach algorithm (idilat = 3)

  • Atmospheric

    • New humid atmosphere model

    • New soil model

    • New solar radiation model

  • Turbulence

    • New v2f (bl-v2k) low Reynolds turbulence model (Billard, Uribe, & Laurence) (iturb = 51)

    • New Rij-EBRSM second order low Reynolds turbulence model (Manceau & Hanjalic, 2002) (iturb = 32)

    • New Spalart-Allmaras high Reynolds turbulence model (iturb = 70)

    • Correction models for rotation and curvature for eddy viscosity turbulence models

    • New turbulent thermal flux models: generalized gradient (GGDH, iturt = 10), algebraic model (AFM, iturt = 20) and transport model (DFM, ITURT = 30)

    • Synthetic Eddy Method (SEM) inlet boundary condition for LES

  • ALE

    • New free surface boundary condition

  • Generalities

    • New porosity model for incompressible flows (iporos)

    • New dilatable algorithm (idilat = 2)

    • New algorithm for stratified flows (iphydr = 2)

    • Radiative outlets



  • Mesh

    • Mesh modification tools

      • Unwarp smoother (non coplanar faces)

      • Thin walls

  • Algebra

    • Adaptation of the algebraic multigrid algorithm for a vectorial Poisson equation

    • New linear solver GMRES (iresol = 3)

  • Navier-Stokes solver

    • Coupling of velocity components (momentum equations) and coupling of the mesh velocity components in ALE (ivelco = 1)

    • New option (iswdyn(ipr) = 1, 2) for an automatic management of sweeps and relaxation coefficient on pressure equation.

    • A new residue is printed in the listing file. It’s now a residue on the complete resolution of the considered equation more representative of the resolution precision (it is no longer the final residual given by the linear solver - be careful: new residue cannot be compared to the previous one -).

    • Rewriting of the temperature equation: Cp is now out of the divergence term (to be consistent with the enthalpy equation). This modification has an influence only when Cp is variable. Be careful: now the diffusion term must not be divided by Cp.

    • New formulation for boundary conditions (split between the gradient and for the diffusive flux boundary conditions)

      • Wall post-treatment simplified to get Nusselt, strain coefficient, etc.

    • Improvement of the robustness of the eddy viscosity turbulence models

    • New numerical methods to solve more rigorously anisotropic diffusion equations (GGDH, head losses, ...).



  • SYRTHES 4.0(parallel version) with volumetric coupling

  • Code_Aster 11.0 via SALOME 6.6 (stabilisation of SALOME module FSI_COUPLING)




  • Unification of packages: bft, fvm, mei, ecs, and ncs are now regrouped in a single directory. The code installation and packaging is thus simplified.

  • The Fortran 95 standard (instead of fortran 90/77 format)

    • Memory dynamic allocation in Fortran files

    • Modules

  • The runcase (calculation launch script) has been simplified, advanced options for launch and pre-processing can be controlled with python scripts and C user files.

  • Factorisation and cleanings in Navier-Stoke solver subroutines

  • Migration to C language

    • Gradients computation is now in C

    • Pre-processing and post-processing user functions

    • New field structure to store solution field has been added. To help the addition of new variables and the migration to C (Ex.: rtp and rtpa arrays).

    • New post-processing structure (“writers” and “mesh”) to easily configure sub-mesh and advanced post-processing

    • Wrapping Fortran <-> C with the iso-c-binding features. To simplify the interaction between C and Fortran code and facilitate the migration to C.

  • Renaming and merging of the most common user subroutines.



  • Parallelisation of mesh joining algorithm (integrated to the kernel).

  • The mesh partitioning is done in parallel (integrated to the kernel).

  • New HPC performance management tool (performance tuning)

    • Automatic choice of the best options (case and machine dependent) to obtain the smaller computational cost (benchmark mode)

    • Simplified interface to select and test HPC options.

  • Parallelisation of Lagrangian particles tracking module

  • Hybrid parallelism MPI/OpenMP (work in progress)

    • Mesh renumbering tools to optimize cache and memory access


Graphical User Interface (GUI):

  • The following functionalities have been added or improved in the GUI:


    • Compressible model

    • Electric arcs

    • Improvement in other advanced modelling management

    • Improvement of pre-processing management

    • Linear algebra

    • Numerical options

    • Performance tuning

    • Batch system calculation management



  • Rewriting of the theory guide

  • A new documentation of source code and user subroutines/functions with Doxygen is now available, including user examples and key words description.

  • Creation of new tutorials and improvements on the previous ones.


New default options:

  • Velocity components coupling is activated by default (ivelco = 1)

  • Improvement of symmetric boundary condition for Rij is activated by default (iclsyr = 1)

    • The previous validation campaign shown that this option is highly recommended to obtain good result with Rij turbulence models in axi-symmetric configurations. Moreover the iclsyr = 1 option is, theoretically, a more exact formulation than the previous one.

  • Relaxation on k-ω has been deactivated (relaxv(iomg) = 1)

    •  The rewriting of eddy viscosity turbulence models previously mentioned to increase the robustness led to remove this relaxation.

  • Relaxation in steady algorithm is set to 0.7 (0.9 in 2.0)

    • This increases the robustness of the algorithm (but it could be more costly on a range of cases). Besides, 0.7 is the standard value in CFD codes.

  • k-ε with linear production turbulence model is suggested by default (in the GUI and in the cs_user_parameters.f90 file)

    • This model was already partially validated on the previous V&V stage and has been fully validated on this one. k-ε with linear production gives equivalent results than k-ε on most of test cases and gives significant better results on a part them (ex. jet impingement). We suggest using this model instead of standard k-ε.


For more details, the reader may refer either to the release notes of the version or to the svn ChangeLog and/or to the NEWS file.