%-------------------------------------------------------------------------------
% UF Sparse Matrix Collection, Tim Davis
% http://www.cise.ufl.edu/research/sparse/matrices/Janna/PFlow_742
% name: Janna/PFlow_742
% [3D pressure-temp evoluation in porous media]
% id: 2661
% date: 2014
% author: C. Janna, M. Ferronato
% ed: T. Davis
% fields: name title A id date author ed kind notes
% kind: 2D/3D problem
%-------------------------------------------------------------------------------
% notes:
% Janna/PFlow_742: 3D pressure-temperature evolution in porous media
%                                                                   
% Authors: Carlo Janna and Massimiliano Ferronato                   
% Symmetric Positive Definite Matrix                                
% # equations:     742,793                                          
% # non-zeroes: 37,138,461                                          
%                                                                   
% The matrix PFlow_742 is obtained from a 3D simulation of the      
% pressure-temperature field in a multilayered porous media         
% discretized by hexahedral Finite Elements. The ill-conditioning   
% of the matrix is due to the strong contrasts in the material      
% properties fo different layers.                                   
%                                                                   
% Further information may be found in the following paper:          
%                                                                   
% 1) C. Janna, M. Ferronato, G. Gambolati. "The use of supernodes   
% in factored sparse approximate inverse preconditioning". SIAM     
% Journal on Scientific Computing, submitted.                       
%-------------------------------------------------------------------------------
