add change log

CHANGELOG.md

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+# BioDeg Change Log
+
+## Version 0.1 - June 2019
+* Full 3D implementation of static degradation model for Mg
+* Interface tracking based on Level set equation
+* Modeling the formation of a protective film and the effect of Cl ions
+* Automatic 3D mesh adaptation on the interface
+* Simple domain decomposition using MPI
+* Using MUMPS direct parallel solver to solve algebraic equations
+* Ability to adaptively refine and (basically) coarsen the mesh during simulation
+* Element-wise VTK output
+* Based on FreeFem++ 3.6
+
+## Version 0.2 - August 2019
+* Ability to import complex geometries in Eulerian mesh
+* Adding an ASCII art as the title
+
+## Version 0.3 - November 2019
+* Adding the pH changes modeling equation to the base model
+* Making the code more configurable
+* Changing the ASCII art to include university of Liege
+* Implementing a non-linear solver for OH equation (not released finally in the code)
+* Making the MPI parallelization scheme compatible with FreeFEM 4.x
+
+## Version 0.4 - January 2020
+* Massively parallel code using PETSc preconditioners and iterative solvers
+* Restricted additive Schwarz Domain decomposition using HPDDM
+* Using METIS for mesh partitioning
+* Not compatible with FreeFEM versions prior to 4.4.3!
+* Changing the VTK output to node-wise format (point data instead of cell data)
+
+## Version 0.5 - June 2020
+* Implementing a newton solver to calculate initial interface velocity
+* Mesh import improvement to include more elements for the scaffold
+* Adding more parameters and configuration settings
+* Ability to save the last state of the model on a non-overlapping mesh
+* Changing the boundary condition of Cl and OH equations to no-flux on the interface
+
+## Version 0.6 - October 2020
+* Ability to export the scaffold (material block) using Mmg
+* Ability to interpolate state variables on the original non-partitioned mesh
+* Dramatic mesh import improvement using chi function
+* Support to read preprocessed distance function (output of an external tool)
+* A minor change in the mesh partitioning technique
+* Saving mass loss fraction to the text output file
+
+## Version 0.7 - February 2021
+* Adding fluid flow equation to the core model
+* Adding convection effect on the transport equations
+* Ability to switch between full Navier-Stokes and Stokes equation
+* Ability to turn off flow effect and equation (or adjust if it should be solved every N steps)
+* Fieldsplit preconditioners for fluid flow equation
+
+## Version 0.8 - November 2021
+* Replacing density and viscosity with dynamic viscosity in fluid equations
+* Rewriting the redistancing code to be compatible with the parallelization scheme
+* Considering the porous characteristic of the film for the fluid equation
+* Fixing the convection behavior on the moving corrosion interface
+* Fixing the MPI buffer issue in Windows