Phalanx Documentation

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The Elevator Speech

Phalanx is a local field evaluation kernel specifically designed for general partial differential equation solvers. The main goal of Phalanx is to decompose a complex problem into a number of simpler problems with managed dependencies to support rapid development and extensibility of the PDE code. Through the use of template metaprogramming concepts, Phalanx supports arbitrary user defined data types and evaluation types. This allows for unprecedented flexibility for direct integration with user applications and provides extensive support for embedded technology such as automatic differentiation for sensitivity analysis, optimization, and uncertainty quantification.

Overview

Phalanx is a local field evaluation kernel specifically designed for general partial differential equation (PDE) solvers. It can be used with any cell-based discretization techniques including finite element and finite volume. The main goal of Phalanx is to decompose a complex problem into a number of simpler problems with managed dependencies to support rapid development and extensibility of the PDE code. This approach, coupled with the template capabilities of C++ offers a number of unique and powerful capabilities:

Phalanx is a hammer. It's use should be carefully considered. We recommend its use when writing a general PDE framework where one needs support for flexibility in equation sets. It should not be used for simple sets of PDEs where the equations rarely change. There are some drawbacks to using Phalanx that should be considered:

Managing these trade-offs can result in application code that both performs well and supports rapid development and extensibility.

Reporting Bugs and Making Enhancement Requests

To reports bugs or make enhancement requests, visit the Trilinos Bugzilla (Bug Tracking) Database, and use the following instructions.

History

Phalanx grew out of the Variable Manger in the Charon code and the Expression Manager in the Aria code. It is an attempt at merging the two capabilities and is slated to provide nonlinear function evaluation to the Intrepid discretiztion package.

Authors and Contributors

The following have contributed to the design through ideas, discussions, and/or code development of Phalanx:

Copyright

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       Phalanx: A Partial Differential Equation Field Evaluation 
      Kernel for Flexible Management of Complex Dependency Chains
                 Copyright (2008) Sandia Corporation

Under the terms of Contract DE-AC04-94AL85000 with Sandia Corporation,
the U.S. Government retains certain rights in this software.

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., 59 Temple Place, Suite 330, Boston, MA 02111-1307
USA

Questions? Contact Roger Pawlowski (rppawlo@sandia.gov), Sandia
National Laboratories.

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For All Questions and Comments...

Please contact Roger Pawlowski (rppawlo@sandia.gov).
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