Ming Tse Paul Laiu

Highlights

Computation time for the iterative solvers on a proto-neutron star deleptonization problem
A DG-IMEX method for two-moment neutrino transport: Nonlinear solvers for neutrino-matter coupling

Neutrino-matter interactions play an important role in CCSN explosions as they contribute to both lepton number and/or four-momentum exchange between neutrinos and matter, and thus act as the agent…

Comparison of several iterative solvers for multiscale simulations of a silicon diode. The implicit solvers are faster than standard explicit (EX) or implicit-explicit (IMEX) schemes. The reduced-order preconditioner gives another 50% speedup.
ORNL researchers develop fast, implicit solvers for multiscale kinetic equations of charged particle transport

Researchers from Oak Ridge National Laboratory and the University of Massachusetts Dartmouth investigated several different approaches for solving fully implicit discretizations of a simplified…

Computation time on randomly generated problems
A Framework for Accommodating Infeasible Starts in Convex Quadratic Optimization, with Application to Constraint-Reduced Interior Point

A framework is proposed for solving general convex quadratic programs (CQPs) from an infeasible starting point by invoking an existing feasible-start algorithm tailored for inequality-constrained…

Steady state free electron distribution of a silicon diode model with a bias voltage.
A fast implicit solver for semiconductor models in one space dimension

Several different approaches are proposed for solving fully implicit discretizations of a simplified Boltzmann-Poisson system with a linear relaxation-type collision kernel.  This system models…