Introduction
Notus opensource CFD code is a 2015 initiative of Institute of Mechanical Engineering  Bordeaux (I2M, Bordeaux University). It is dedicated to the modelisation and simulation of incompressible fluid flows in a massively parallel context. Its numerical framework is the 2D/3D Finite Volume methods on Cartesian staggered grids.
The aims of the project are to provide a code:
 for the mechanical community, that is easy to use and adapt, based on proven stateoftheart numerical methods;
 for the mathematical community in order to develop new numerical schemes without having to rewrite a complete code, offering a fast, efficient and approved framework for comparative and qualitative tests on numerical and physical cases;
 that runs on massively parallel supercomputers (such as the ones available at GENCI/PRACE and various French mesocentres), while masking parallelism complexities for easy programming;
 that offers numerical tools that can be easily used to solve novel mathematical and physical problems of your own;
 that is thoroughly validated and documented.
More information can be found on its Web site.
Documentation
Documention can be found on Documentation web site.
Forum
Forum can be found on Forum web site.
Credits

Initial developers
 Mathieu Coquerelle
 Stéphane Glockner  Head of the project
 Antoine Lemoine
 Joris Picot

Current developpers
 Theo Baldaccino
 Mirco Ciallella
 Mathieu Coquerelle
 Florian Desmons
 Stéphane Glockner
 Jérôme Jansen
 Matthias Largen
 Antoine Lemoine
 Asaph Kim Homer Palencia
 Cédric Palka
 Fabien Salmon
 Alban Vergnaud

Past Contributors
 Joris Picot, Hamed Bouare, Idriss Daoudi, Anna Lefay, Nicolas Bourdineaud, Gabriel Suau, Robin Colombier, Antoine Michael Diego Jost, Félix Henri, Quentin Thomas, Odelin Gentieu
Contact
To contact Notus developers, please send an email to notusdevelopers@bordeauxinp.fr.
Licence
Notus is distributed under the CeCILL FREE SOFTWARE LICENSE AGREEMENT.
Changelogs
Notus 0.6.0
Notus is still under active development (till version 1.0.0).

NavierStokes
 Subsonic compressible method (material properties: perfect gas, Peng Robinson, polynomial and neutral network material laws)
 WALE LES model

Multiphase
 MOF: analytic formula for tetrahedra and GaussNewton algorithm
 Conservative VOFPLIC method (Weymouth)
 Levelset: reinitialisation with Closest Points + Kinks
 Smoothing: Bspline cubic kernel smoothing
 Phase change: linearised enthalpy method

Immersed boundaries
 Repartitioning process to exclude "solid" partitions from the domain

Miscellaneous
 Update build system
 Nonregression: implement database in python script, convergence tools
 Automatic checkpoint file names
 NTS language improved
 Solvers: refactor the solver interfaces

...and some minor improvements and bugs fixed here and there.
Notus 0.6.0

Immersed boundaries
 Framework improved
 Explicit part improved
 Cut cells generation improved
 Some test cases added

Schemes
 WENO3/5 schemes optimized (CPU time)
 HOUC3/5 schemes added
 LaxWendroff TVD limiters addition  minmod, Van Leer, MC, Sweby limiter, TVDal, & TVDblend
 QUICK implicit scheme for scalar equations added

NavierStokes
 Momentum preserving method improved
 Driving pressure added (Boussinesq approximation)

Multiphase
 Levelset: some Heaviside approximations added
 MOF2D: Implement MOF in axisymmetric coordinates
 MOF2D: Navier boundary condition added
 MOF2D: add support of immersed boundaries in MOF reconstruction
 MOF3D: analytic reconstruction improved
 Height function: with axisymmetric coordinate system (VOFPLIC + MOF)
 3D curvature computation with height function improved

Miscellaneous
 notus.py script modifications + Linux Slurm template
 Add a scalability mode in Python script
 Add raytracing to shapes
 Unify all build scripts into build_notus.sh
 Add generic routines for algebraic operations that include OpenMP directives
 Some code architecture changes
 Add a checkpoint metric (cpu_time or time_iteration)
 Add user fields and variables initialization routines
 Doc updated

IO
 ADIOS singleprecision support
 Third party T3PIO library
 XMDF, Pixie, ADIOS2 file format (3D only)

...and some minor improvements and bugs fixed here and there.
Notus 0.4.0

Immersed boundaries
 New 2D/3D methods for Cartesian grids that reduce stencil size and/or improve precision
 Some explicit schemes developed to be compatible with immersed boundaries (LW TVD Superbee)

Schemes
 LaxWendroff TVD Superbee limiter for scalar and NavierStokes
 Some schemes compatible with asymmetric coordinate system
 User implicit scheme for scalar equation
 Implicit second order schme for diffusion and rectilinear (stretched) grids
 SBDF3 for energy equation
 Optimized WENO schemes for the inertial term on uniform grids

Navierstokes
 Pressure correction method : approximation of Dodd (density) and Frantzis (boundary condition)
 Implicit / Explicit / CrankNicholson integration of the gravity term

Turbulence
 RANS komega & v2f (first step)
 Improved statistic module

Multiphase
 Improved redistanciation
 MOF 3D reconstruction, add filters to MOF 2D
 Refined grid approach (MOF, VOFPLIC)
 Height function computation of curvature (MOF, VOFPLIC)
 Momentum preserving method

Performance
 Setup of Hypre solvers done only once
 Improved performance of some key routines
 Removed limitation to 2.2 billion cells in partitioning
 Hybrid OpenMP / MPI approach (1st step)

Miscellaneous
 Robin boundary conditions for scalar
 Quadratic boundary condition schemes
 Validation improved
 Add several diagnostic tools
 NaN detection to stop simulations

Linear system solver
 Add a Notus solver (BiCGStab)

IO
 Add probe point and probe lines
 Improved checkpoint / restart
 Add EnSight Gold writer

...and some bugs fixed here and there.
Notus 0.3.0

NTS files

Validation of the code
 new validation script notus.py that includes parametric validation (@PARAMETER)
 cleanup of some test case files (reference solution, initialization, source term can be written in the NTS file)

Material block (solid, fluid). Phase initialization is independent of phase advection.

Immersed boundary (by equation, several immersed boundaries now possible)

Time step: fixed or adaptive

Post processing
 print fields on a set of probe points and/or lines

Boundary condition:
 line_segment (2D) and rectangle/circle (3D) shapes
 Robin boundary condition (for scalar equation)

Checkpoint/restart
 use of ADIOS bp files (it is possible to restart with a different number of processors)
 initialization of a simple field thanks to a bp file
 option to set the final time instead of the number of iterations

Documentation
 Improve documentation : installation guide, howtos, best practices, detailed numerical schemes, etc.

Multiphase
 MOF 2D : filament treatment
 MOF 3D : polyhedron flood algorithm, polyhedron clipping algorithm
 Stable and accurate advanced Level Set methods (advection, reinitialization: eikonal, HCR2)
 Front tracking interface representation: coupling with FronTier (C++) library for 2D flows with surface tension

Immersed boudarie methods
 2D and 3D improvements
 SBDF2 method for advection terms (NS, energy, species) coupled with highorder explicit schemes (WENO3, WENO5), various fluxes (Godunov, LW, FLIC, FORCE) and NSSP time integration schemes.
 New interpolation/reconstruction/finite difference schemes (generic Lagrange, WENO, Peskin, etc.)

Miscellaneous
 2D asymmetric (NavierStokes, Energy, Levelset)
 Add a Poisson equation (used to initialize hydrostatic pressure)
 Renaming of some variables, routines
 MPI exchange on edges
 Experimental works: generic lagrangian particles and semilagrangian advection schemes
 New test cases added
 Notus can ben run from any directory (if included in PATH variable)
 New structures for boundary conditions
 New objects (torus, half space)

... and some bugs fixed here and there.