# 6.0.4
### Features:
 - Parallel computing framework for FEM by using PETSc, which also includes
   - Parallel input of partitioned mesh data.
   - Parallel output of solutions by using pvtu data format.
 - New data structures for mesh properties are used everywhere replacing
   Element's value member.
 - The penalty method to impose first-type boundary conditions was substituted
   with a non-penalty method for LIS and Eigen linear solvers.
 - Support for multiple nodal variables is extended to the boundary conditions,
   the sparsity pattern.
 - Passing of linear solver options from the project files is now possible.
 - The global matrix and global vector type of indices is consistent with the
   linear solver library being used.

### Infrastructure

- Added CMake option `OGS_CPU_ARCHITECTURE`, #858, [downloadable binaries](http://docs.opengeosys.org/download) build by Jenkins should now run on more CPUs
- Added CMake options for Boost, VTK and Eigen (`OGS_LIB_BOOST`, ...) to specify if libs are searched on the system first, then build them locally (`Default`), or you can specify to just use system libs (`System`) or force a local build (`Local`)
- Added CMake options for enabling Clang sanitizer:
  - `OGS_ADDRESS_SANITIZER`
  - `OGS_UNDEFINED_BEHAVIOR_SANITIZER`
- The zlib library is removed from ThirdParty directory.
- A LIS solver interface using Eigen's sparse matrices is now available through
  CMake option `OGS_USE_EIGENLIS`.
- CMake configuration uses [ccache](https://ccache.samba.org/) if available.

### Documentation

- Added [offline viewable Doxygen documentation](http://docs.opengeosys.org/docs/devguide/documentation/offline-documentation-viewer)

### Fixes
 - Fix all ogs-internal warnings on all OS.
 - Move eigen solver compute call to solve(); different fix for 0237275

# 6.0.3

### Features:
 - Mesh properties are now used for:
   - heterogeneous "initial conditions" (actually a start solution vector for the elliptic problem).
   - spatially heterogeneous hydraulic conductivity values in the groundwater flow process.
 - First steps towards time dependent problems: Time loop integration for processes is provided.
 - Interpolation of nodal quantities on elements using shape functions.

- Mesh generator can create surface meshes according to a given function

 - Utilities:
  - MoveGeometry

 - The DOF table handles now all of the provided element types: Hex 8 and 20, Line 2 and 3, Prism 6 and 15, Pyramid 5 and 13, Quad 4, 8, and 9, Tet 4 and 10, Triangle 3 and 6.
 - Eigen linear solver library can be used for solution of the linear systems of equations.

- Implemented [OctTree](https://github.com/ufz/ogs/pull/714) for fast searching
  points and nodes
 - Volumetric and surface grid
 - ElementSearcher NodeSearcher improvements
- Generalized the computation of rotation matrix to xy

### Fixes
 - FEFLOW interface supports element sets now.
 - Reduce compilation times by using forward declarations and removing unnecessary includes and using explicit template instantiation for often required classes.
 - GMSH2OGS: fixed bug in cases GMSH mesh does not contain line elements
 - CreateBoundaryConditionsAlongPolylines: fixed bug concerning the GeoLib and point ids.
 - PointVec corrected point id map
 - Shape interface creates polylines in a consistent state


### Infrastructure
- Replace quickcheck with autocheck. See https://github.com/thejohnfreeman/autocheck.git
for more details on autocheck
- Added support for cross-compiling with [MXE](http://mxe.cc/): build native Windows binaries on Linux and Mac OS, see [Cross-Compiling help page](http://docs.opengeosys.org/docs/devguide/advanced/cross-compiling) and #767
- Migrated to new Travis infrastructure (faster build times), see #775
- Simplified CMake library linking, see #769


## Test examples
- Test case: groundwater flow in the Unstrut catchment (model consists approximately of 9e6 hexahedral cells)
  - Simulations using homogeneous and heterogeneous hydraulic conductivity
  - Integrated rivers as Dirichlet type boundary conditions
  - Integrated groundwater recharge (spatialy homogeneous) as Neumann boundary condition

![unstrut_heterogeneous_rivers_top_layer_diff_recharge-no_recharge](https://cloud.githubusercontent.com/assets/329493/10043383/f75b837a-61f2-11e5-952e-f75d5d5a195b.png)

## Next steps
 The next big step will be the implementation of a parallelization scheme using PETSc library

### In development
- OGS#PETSc interface for parallel computing
- Solving of time dependent problems

### Planned
- Implementation of a linear parabolic pde solver
- Extending the linear elliptic solver to non-linear problems

# 6.0.2

| Released on 2015/06/15, [GitHub Release Link](https://github.com/ufz/ogs/releases/tag/6.0.2)

## Release notes

The second release of ogs6 introduces Neumann boundary conditions and VTK result output.

### Features:

- [Neumann boundary conditions](http://docs.opengeosys.org/docs/benchmarks/elliptic/groundwater-flow-neumann)
- Implement mesh properties for storage of data fields. This also includes mapped values (e.g. based on material id) [PR #542](https://github.com/ufz/ogs/pull/542), [PR #644](https://github.com/ufz/ogs/pull/644),
- Refactored mesh property classes to [enable VTK output](https://github.com/ufz/ogs/pull/692)
- Extended the available elements to quadratic (e.g. Quad8) based on generalized "element rules".  [#572](https://github.com/ufz/ogs/pull/572), [PR #656](https://github.com/ufz/ogs/pull/656), [PR #657](https://github.com/ufz/ogs/pull/657),
- Extend computation of shape matrices to lower dimensional elements embedded in higher dimensional space [#655](https://github.com/ufz/ogs/pull/655)
- Builds with MinGW (GCC) on Windows, see [Developer Guide](http://docs.opengeosys.org/docs/devguide/getting-started/prerequisites) and the new MinGW platform instructions
- [Cross-compiling for Windows with MXE on Mac OS](http://docs.opengeosys.org/docs/devguide/advanced/cross-compiling)
- [Support for new cross-platform IDE CLion](http://docs.opengeosys.org/docs/devguide/development-workflows/development-ides#clion)
- Add gradual refinement to the structured mesh generator [PR #539](https://github.com/ufz/ogs/pull/539)
- Add a command line tool "queryMesh" to search mesh information [PR #665](https://github.com/ufz/ogs/pull/665)
- Add a command line tool "AddTopLayer" to add an additional top layer (for example a soil layer, see also the [documentation](http://docs.opengeosys.org/docs/tools/meshing/addtoplayer)) [PR #649](https://github.com/ufz/ogs/pull/649)

### Fixes

- Performance optimizations in VTK mesh conversion, [PR #695](https://github.com/ufz/ogs/pull/695)
- Improve layered prism mesh construction
- Fix a lot of warnings on gcc/clang/msvc compilers improving the code


### Infrastructure

- Test runtime is monitored at Jenkins for [normal](https://svn.ufz.de:8443/job/OGS-6/job/Tests_Linux/) and [nightly large tests](https://svn.ufz.de:8443/job/OGS-6/job/Tests_Linux_Large/)
- Utilities are build by separate Jenkins Jobs, e.g. [Win_Utils](https://svn.ufz.de:8443/job/OGS-6/job/Win_Utils/)

## Test examples

- [Groundwater flow (Neumann)](http://docs.opengeosys.org/docs/benchmarks/elliptic/groundwater-flow-neumann):
![](http://docs.opengeosys.org/assets/files/Documentation/Selected-Benchmarks/groundwaterflow-neumann/square_1e2_neumann_result.png)

## Next steps

### In development

- Heterogeneous fields (for e.g. hydraulic conductivity parameters)
- Octree data structures for fast searches
- OGS#PETSc interface for parallel computing

### Planned

- Parallelization scheme using PETSc library
- Extending the linear elliptic solver to non-linear problems


--------------------------------------------------------------------------------

# 6.0.1

| Released 2015/03/02, [GitHub Release Link](https://github.com/ufz/ogs/releases/tag/6.0.1)

The 6th version of OpenGeoSys (OGS) is under way. After single and coupled FORTRAN modules in ROCKFLOW 1+2, the C version 3 with dynamic data structures, the object-oriented C++ parallelized version 4, completed with data integration and visualization tools by version 5; ogs6 - as an open source project - is aimed at performing on supercomputing platforms and providing complete workflows for solving of coupled multi-field problems in real world applications. The major paradigms of ogs6 are being developer-friendly, performing, and user-friendly.

## Important links:

- Getting started tutorial: http://docs.opengeosys.org/docs/quickstart
- Descriptions of selected benchmarks: http://docs.opengeosys.org/docs/benchmarks

- Source code access: https://github.com/ufz/ogs
- Developer guide: http://docs.opengeosys.org/docs/devguide

## Release notes
The first version ogs6 is dedicated for elliptic problems.

### Features:
 - Basic structures of processes
 - Mathematical operations are based on Eigen3 library
 - Linear solvers: DenseMatrix with Gauss elimination, and LIS (http://www.ssisc.org/lis/)
 - XML based IO
 - Standard finite element method (FEM)
 - Available element types: lines, triangles, quads, hexahedra
 - Dirichlet boundary conditions
 - Linear elliptic solver (e.g. Groundwater flow) for scalar quantities in homogeneous media

### Fixes
- DenseMatrix Gauss algorithm pivoting

## Test examples
![](https://cloud.githubusercontent.com/assets/329493/6170573/ce9fd96c-b2d5-11e4-9936-a470e7be281f.png)

 - Example 1: Unit square (access)
 - Example 2: Unit cube (access): has 1000 hexahedra  elements with Dirichlet boundary conditions (u=1|x=0) and (u=-1|x=1)

## Next steps

### In development
 - OGS#PETSc interface for parallel computing (02/2015*planned)
 - Neuman boundary conditions (03/2015*planned)

### Planned
 - Parabolic solver