ORNL / kelvin

This is a repository for Kelvin, a multiphysics sintering simulation code.

HOWTO Work with Kelvin

Prerequisites

Kelvin requires ORNL's Parsers utility library which you can download as source from https://github.com/jayjaybillings/parsers. Kelvin also requires the Modified Finite Element Method (MFEM) library, which you can download and build from http://mfem.org.

Build

Kelvin uses CMake to compile and build the source code into a library and executables. It can be built with many standard options, which can be viewed by passing the --help flag to CMake during that phase of the build. The "make install" step in Kelvin's will install the artifacts to the directoy specified by the CMake flag -DCMAKE_INSTALL_PREFIX=<your_install_path>. The entire project can be configured and build with a few easy steps, starting from the source directory:

$ mkdir build/
$ cd build/
$ cmake ../ -DPARSERS_DIR=$PARSERS_ROOT_DIR -DMFEM_DIR=$MFEM_ROOT_DIR
$ make

where $PARSERS_ROOT_DIR and $MFEM_ROOT_DIR are the locations of the Parsers and MFEM installation directories. Both directories are the installation directories, not the build or source directories. The following is an example for a user name bob:

$ cmake ../ -DPARSERS_DIR=/home/bob/parsers-install -DMFEM_DIR=/home/bob/mfem-install

For developers who are working with Eclipse, CMake will auto-generate the Eclipse project files with the following configuration options and setup a debug build with the following configuration:

$ cmake ../ -DCMAKE_BUILD_TYPE=Debug -G"Eclipse CDT4 - Unix Makefiles" -DCMAKE_ECLIPSE_VERSION=4.5 -DPARSERS_DIR=/home/bob/parsers-install -DMFEM_DIR=/home/bob/mfem-install 

Build flags, such as -Wall, can be set by prepending the CXX_FLAGS variable to the cmake command as such

CXX_FLAGS='-Wall' cmake ../fire -DCMAKE_BUILD_TYPE=Debug -G"Eclipse CDT4 - Unix Makefiles" -DCMAKE_ECLIPSE_VERSION=4.5

Optimization flags should be handled by setting -DCMAKE_BUILD_TYPE=Release instead of Debug. Likewise, an optimized build with debug information can be acheived by setting -DCMAKE_BUILD_TYPE=RelWithDebugInfo.

Testing

Unit tests can be executed after the build by executing

$ make test

Individual tests can be executed in the directories in which they were built. Debug text can be printed by modifying the command line:

$ BOOST_TEST_LOG_LEVEL=all ./test-to-run

Input

Kelvin uses a simple INI file format for input which consists of blocks, keys and values. See input.ini for a working example of the format.

Boundary Conditions

Dirichlet/Essential Boundary Conditions are specified using the conventions of MFEM. Meshes should number all boundary elements sequentially by side such that all boundary elements on side 1 are on number 1, 2 for those on side 2, etc.

By default the thermal boundary condition on each side is set using the surfaceTemperature element of the [thermal] block. Heat fluxes can be specified on a side-by-side basis. Initial temperature values for all interior nodes is set using the initialTemperature element.

Meshes

Mesh option block

[mesh]
file= # The name of the file in the local file system
order= # The order of the finite elements in the file 

Kelvin supports any meshes supported by MFEM. Note that when a NETGEN neutral format mesh is used it is necessary to add the word "NETGEN" as the first line in the mesh file if it is not already available.