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TIOGA - Topology Independent Overset Grid Assembler

TIOGA-CI

TIOGA is a library for overset grid assembly on parallel distributed systems Copyright (C) 2015 Jay Sitaraman

This library is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by the Free Software Foundation; either version 2.1 of the License, or (at your option) any later version.

This library is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details.

You should have received a copy of the GNU Lesser General Public License along with this library; if not, write to the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA

Contact: Jay Sitaraman, jsitaraman@gmail.com, (301) 741 3216, Parallel Geometric Algorithms LLC, 814 S Mary Ave, Sunnyvale, CA 94087

Functionality

TIOGA can perform overset grid connectivity in 3-D between multiple unstructured (or structured) meshes that are in a distributed computing environment, i.e. each mesh is partitioned in to multiple parts. It can accept high-order call-back functions to perform p-consistent interpolation and searches for formulations with internal degrees of freedom within a computational element.

Notes

TIOGA is free software since it was developed in the personal time of the author. It is expected to serve as an academic/research counterpart for PUNDIT (which is the product of the CREATE A/V program and is export controlled). TIOGA has a subset of the functionality of PUNDIT and is about 3x slower owing to the use of Alternating Digital Tree (ADT) searches as the baseline point-location algorithm.

News

TIOGA is currently under development with funding from the DoE ExaWind program towards developing overset capability in the DoE ExaWind codes for large scale wind farm simulations. The original code is available here.

References

Michael J. Brazell, Jayanarayanan Sitaraman, Dimitri J. Mavriplis, An overset mesh approach for 3D mixed element high-order discretizations, In Journal of Computational Physics, Volume 322, 2016, Pages 33-51, ISSN 0021-9991, https://doi.org/10.1016/j.jcp.2016.06.031. (http://www.sciencedirect.com/science/article/pii/S002199911630256X)

Roget, B. and Sitaraman, J., "Robust and efficient overset grid assembly for partitioned unstructured meshes", Journal of Computational Physics, v 260, March 2014, Pages 1-24

Brazell, M., Sitaraman J. and Mavriplis D.,"An Overset Mesh Approach for 3D Mixed Element High Order Discretizations", Proceedings of 2014 Overset Grid Symposium, Atlanta, GA, Oct 6-9, 2014. http://2014.oversetgridsymposium.org/assets/presentations/3_1/Brazell_ogs_2014.pdf

Building

Building and installing TIOGA using CMake

TIOGA has been configured to use CMake to configure, build, and install the library. The user can choose standard CMake options as well as additional TIOGA-specific options to customize the build and installation process. A brief description of the CMake-based build process and configuration options are described in this document.

The minimal dependencies to build TIOGA on your system are CMake, a working C, C++, and Fortran compilers as well as an MPI library along with its headers. If the dependencies are satisfied, then execute the following commands to clone and build TIOGA:

git clone <TIOGA_GITHUB_URL>
cd tioga

# Create a build directory
mkdir build

# Configure build using auto-discovered parameters
cmake ../

# Build the library
make

When the steps are successfully executed, the compiled static library is located in tioga/build/src/libtioga.a.

Building driver and gridGen executables

By default, CMake does not build the tioga.exe driver code or the buildGrid executable. To enable these at configure phase:

cmake -DBUILD_TIOGA_EXE:BOOL=ON -DBUILD_GRIDGEN_EXE:BOOL=ON ../

followed by make. The executables will be located in build/driver/tioga.exe and build/gridGen/buildGrid respectively.

Customizing compilers

To use different compilers other than what is detected by CMake use the following configure command:

CC=mpicc CXX=mpicxx FC=mpif90 cmake ../

Release, Debug, and other compilation options

Use -DCMAKE_BUILD_TYPE with Release, Debug or RelWithDebInfo to build with different optimization or debugging flags. For example,

cmake -DCMAKE_BUILD_TYPE=Release ../

You can also use CMAKE_CXX_FLAGS, CMAKE_C_FLAGS, and CMAKE_Fortran_FLAGS to specify additional compile time flags of your choosing. For example,

cmake \
  -DCMAKE_BUILD_TYPE=RelWithDebInfo \
  -DCMAKE_Fortran_FLAGS="-fbounds-check -fbacktrace" \
  ../
Custom install location

Finally, it is usually desirable to specify the install location when using make install when using TIOGA with other codes.

# Configure TIOGA several options
CC=mpicc CXX=mpicxx FC=mpif90 cmake \
  -DCMAKE_INSTALL_PREFIX=${HOME}/software/ \
  -DBUILD_TIOGA_EXE=ON \
  -DBUILD_GRIDGEN_EXE=ON \
  -DCMAKE_BUILD_TYPE=RelWithDebInfo \
  -DCMAKE_Fortran_FLAGS="-fbounds-check -fbacktrace" \
  ../

# Compile library and install at user-defined location
make && make install