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	Center for Nonlinear Studies
	Home  ▶ People   Current   Executive Committee   Postdocs   Visitors   Students   Research   Publications  ▶ Conferences   Workshops   Sponsorship  ▶ Talks   Seminars   Postdoc Seminars Archive   Quantum Lunch   Quantum Lunch Archive   P/T Colloquia   Archive   Ulam Scholar     Postdoc Nominations  ▶ Student Requests   Student Program  ▶ Visitor Requests   Description   Past Visitors  ▶ Services   General     History of CNLS     Maps, Directions   CNLS Office   T-Division   LANL				Wednesday, November 02, 201111:00 AM - 12:00 PMCNLS Conference Room (TA-3, Bldg 1690) Seminar The time integration landscape for multi-physics problems and tightly coupled solvers with loosely coupled software: multi-physics and time integration in PETSc Jed BrownArgonne National Laboratory Multiphysics software often relies on ad-hoc operator splitting methods, largely due to implementation complexity and commitment required to use fully implicit methods. PETSc's new algebraic interfaces for coupling enable maintainable single-physics assembly routines to be reused for semi- or fully-implicit multi-physics with a runtime choice of monolithic or field-split solvers. Runtime choice of a nested matrix format requires no additional memory for field-split and each single-physics block uses the best available matrix format (blocked and/or symmetric). Fully implicit and IMEX time integrators with adaptive error control are also available through a common interface. Host: Xianzhu Tang, T-5, 665-2141