PHAML version 1.18.1 can now be downloaded as the file phaml1.18.1.tar.gz (11.4 MB) for Unix systems and MS Windows with Cygwin. When unpacked, it will place everything in a directory named phaml1.18.1.
PHAML version 1.11.1 is also available but is not an official release. This is the code that was used for the paper A Comparison of hpAdaptive Strategies for Elliptic Partial Differential Equations, ACM Transactions on Mathematical Software, 41 (1), 2014. It is available in case someone wants to attempt to reproduce the results in that paper.
The User's Guide is included as a pdf file in the distribution, or it can be obtained here as a pdf file (3.8 MB). There is also a two page Quick Start guide.
Send questions, bug reports, etc. to phaml@nist.gov.
If you would like to be added to the PHAML announcement email list, send a request to phaml@nist.gov. This is a very low volume list used only for announcements concerning PHAML.
PHAML is in the public domain and not subject to copyright. Please see the LICENSE file.
An adaptive multilevel grid on four processors. Each panel shows the grid on one processor. The colors indicate which processor is the "owner" of the triangles. From left to right, the processor colors are green, cyan, purple and red. The grids have been separated by refinement level to show the multigrid sequence. 
The primary goal of the PHAML (Parallel Hierarchical Adaptive MultiLevel method) project is to develop new methods and software for the efficient solution of 2D elliptic partial differential equations (PDEs) on distributed memory parallel computers and multicore computers using adaptive mesh refinement and multigrid solution techniques.
The main accomplishments and features of PHAML are:
With its wide range of features and choices, PHAML can be (and has been) used for many purposes including:
PHAML solution on four processors of an equation with a singular boundary condition. The colors or shades of gray indicate the region assigned to each processor. 
The research performed by the PHAML project has resulted in several advances in numerical methods for the solution of PDEs on parallel computers. Further details can be found by clicking on the link for each topic.
Two visualizations of an 8 processor partition of a grid adapted to a circular wave front. 
The methods developed by the PHAML project have been implemented in the research code PHAML. PHAML is written in Fortran 90 and uses MPI for message passing and OpenMP for shared memory parallelism. Further details can be found by clicking on the link for each topic.

A solution computed on eight processors. 
If you do not have the software to read the available formats, an alternate format or a paper copy of these documents will be mailed to you if requested from William Mitchell.
Mitchell, W.F., PHAML User's Guide , NISTIR 7374 , 2006. (original, pdf, 3.2M ) (latest revision, pdf)
Mitchell, W.F. and McClain, M.A., A Comparison of hpAdaptive Strategies for Elliptic Partial Differential Equations, ACM Transactions on Mathematical Software , 41 (1), 2014. (preprint, pdf, 792K) ( link to journal)
Mitchell, W.F. and McClain, M.A., A Comparison of hpAdaptive Strategies for Elliptic Partial Differential Equations (long version), NISTIR 7824, 2011. ( pdf, 33M, 215 pages)
Mitchell, W.F. A Collection of 2D Elliptic Problems for Testing Adaptive Algorithms, NISTIR 7668, 2010. ( pdf, 1.6M)
Mitchell, W.F. and McClain, M.A. A Survey of hpAdaptive Strategies for Elliptic Partial Differential Equations, in Recent Advances in Computational and Applied Mathematics (T. E. Simos, ed.), Springer, 2011, pp. 227258. (preprint, pdf, 16M)
Mitchell, W.F., A Refinementtree Based Partitioning Method for Dynamic Load Balancing with Adaptively Refined Grids , J. Par. Dist. Comp., 67 (4), 2007, pp. 417429. ( pdf, 2.5M) ( link to journal )
Mitchell, W.F., Hamiltonian Paths Through Two and ThreeDimensional Grids , NIST J. Res. , 110, (2005), pp. 127136. ( gzipped postscript, 79k)
Mitchell, W.F., Parallel Adaptive Multilevel Methods with Full Domain Partitions , App. Num. Anal. and Comp. Math., 1, (2004), pp. 3648. ( gzipped postscript, 286k)
Mitchell, W.F., The Design of a Parallel Adaptive MultiLevel Code in Fortran 90, Proceedings of the 2002 International Conference on Computational Science, 2002. ( gzipped postscript, 50k)
Mitchell, W.F., Adaptive Grid Refinement and Multigrid on Cluster Computers, Proceedings of the 15th International Parallel and Distributed Processing Symposium, IEEE Computer Society Press, 2001. ( gzipped postscript, 200k)
Mitchell, W.F., A Comparison of Three Fast Repartition Methods for Adaptive Grids, Proceedings of the Ninth SIAM Conference on Parallel Processing for Scientific Computing, 1999. ( gzipped postscript, 50k)
Mitchell, W.F., A Parallel Multigrid Method Using the Full Domain Partition, Electronic Transactions on Numerical Analysis, 6 (1998) pp. 224233, special issue for proceedings of the 8th Copper Mountain Conference on Multigrid Methods. ( gzipped postscript, 100k)
Mitchell, W.F., The Full Domain Partition Approach to Parallel Adaptive Refinement, IMA Volumes in Mathematics and its Applications, 113, SpringerVerlag, 1998, pp. 151162. Volume devoted to the IMA Workshop on Grid Generation and Adaptive Algorithms. ( gzipped postscript, 138k)
Mitchell, W.F., The RefinementTree Partition for Parallel Solution of Partial Differential Equations, NIST Journal of Research, 103 (1998), pp. 405414. ( gzipped postscript, 96k)
Mitchell, W.F., The Full Domain Partition Approach to Distributing Adaptive Grids, Applied Numerical Mathematics, 26 (1998) pp. 265275, special issue for the proceedings of Grid Adaptation in Computational PDEs: Theory and Applications. (gzipped postscript, 102k)
Mitchell, W.F., The Full Domain Partition Approach for Parallel Multigrid on Adaptive Grids, Proceedings of the Eighth SIAM Conference on Parallel Processing for Scientific Computing, 1997. (gzipped postscript, 179k)
Mitchell, W.F., Refinement Tree Based Partitioning for Adaptive Grids, Proceedings of the 7th SIAM Conference on Parallel Processing for Scientific Computing, SIAM, 1995, pp. 587592. (gzipped postscript, 75k)
Mitchell, W.F., Optimal multilevel iterative methods for adaptive grids, SIAM J. Sci. Statist. Comput. 13 (1992), pp. 146167.
Mitchell, W.F., Adaptive refinement for arbitrary finite element spaces with hierarchical bases, J. Comp. Appl. Math. 36 (1991), pp. 6578.
Mitchell, W.F. A comparison of adaptive refinement techniques for elliptic problems. ACM Trans. Math. Soft. 15 (1989), pp. 326347.
Mitchell, W.F., Unified multilevel adaptive finite element methods for elliptic problems, Ph.D. thesis, Technical report UIUCDCSR881436, Department of Computer Science, University of Illinois, Urbana, IL, 1988. ( gzipped postscript, 194k)
Development status: Active Development
Last change to this page: October 10, 2017
Date this page created: 1997
Contact: William Mitchell
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