This article introduces two strategies to reduce the memory cost of Adaptive Multipreconditioned FETI method (AMPFETI) while preserving its capability solve ill conditioned systems efficiently. Their common principle is gather search directions into aggregates which are frequently adapted in order achieve best compromise between decrease solver error and computational resources employed. The me...

Submitted for the DPP07 Meeting of The American Physical Society Preconditioning and Scalability of Implicit Extended MHD Plasma Simulation by FETI-DP Domain Substructuring1 ALAN H. GLASSER, Los Alamos National Laboratory — The large range of multiple length and time scales in extended MHD plasma simulation makes it imperative to achieve efficient computation of implicit time steps on petascale...

A brief description is given of the anatomy, innervation and mechanical properties of the extensor tibiae muscles of the locust. Each is innervated by a 'fast' (FETi) and 'slow' (SETi) excitatory axon, one branch of a common inhibitor (CI) and a fourth small axon (DUMETi). The prothoracic and mesothoracic extensors contract more rapidly than the metathoracic muscle but exhibit a stronger 'catch...

Second order elliptic problems with discontinuous coefficients are considered. The problem is discretized by the finite element method on geometrically conforming non-matching triangulations across the interface using the mortar technique. The resulting discrete problem is solved by a FETI-DP method. We prove that the method is convergent and its rate of convergence is almost optimal and indepe...

where μ , and λ are the Lamé parameters. The state (displacement field) is sought in V = H1 0 (Ω ,∂ΩD) 2 = {y ∈ H1(Ω)2 : y = 0 on ∂ΩD}, where Ω ⊂ R2 and ∂ΩD is part of its boundary. For simplicity, we consider the case of volume control, i.e., U = L2(Ω). Dual-primal FETI methods were first introduced by Farhat, Lesoinne, Le Tallec, Pierson, and Rixen [3] and have successfully scaled to 105 proc...

In bulk FeTi alloys prepared by facing target type sputtering, an amorphous phase was obtained between 25 and 75 at% Ti. These alloys are weak itinerant electron ferromagnets and the Curie temperature decreases with increasing Ti concentration and becomes zero at about 60 at% Ti.