Scientific Computation and Applied & Industrial Mathematics Seminar: Chen Greif
Topic
Null-Space Based Block Preconditioners for Saddle-Point Systems with a Maximally Rank-Deficient Leading Block
Speakers
Details
We consider nonsingular saddle-point matrices whose (1,1) block is maximally rank deficient, and show that the inverse in this case has unique mathematical properties. We then develop a class of indefinite block preconditioners that rely on approximating the null space of the leading block. Under certain conditions, even though the preconditioned matrix is a product of two indefinite matrices, the conjugate gradient method can be applied and is rapidly convergent. Spectral properties of the preconditioners are observed, which are validated by numerical experiments.
This is joint work with Ron Estrin.
This is joint work with Ron Estrin.
Additional Information
Location: ESB 4133
Chen Greif, UBC
Chen Greif, UBC
This is a Past Event
Event Type
Scientific, Seminar
Date
September 30, 2014
Time
-
Location