... processor computer factorization spe 79713 parallelization solver speedup reservoir simulation iteration upstream oil & gas model 2 modeling & simulation model 3 simulator solver iteration decision support system reduction ilu factorization spe reservoir simulation...

... matrix A . The basic idea of incomplete LU-factorization (ILU-factorization) is to preserve the sparsity in the L and U factors by neglecting most of, or even all, the fill-in terms during the elimination procedure (see e.g. [ 8 ]). Of course, then the product LU is only an approximation...

... less implicit formulations such as IMPES 4 , 13 . This latter formulation results in singly-banded systems which are often fairly close to being symmetric. Applications to both types of systems will be discussed in this paper. Another variation on the ILU factorization plus ORTHOMIN acceleration...