Implementation and Evaluation of Multigrid Linear Solvers into Extended Magnetohydrodynamic Codes for Petascale Computing

Award Information
Agency:
Department of Energy
Amount:
$99,655.00
Program:
SBIR
Contract:
DE-FG02-07ER84730
Solitcitation Year:
2007
Solicitation Number:
DE-PS02-06ER06-30
Branch:
N/A
Award Year:
2007
Phase:
Phase I
Agency Tracking Number:
82133
Solicitation Topic Code:
36
Small Business Information
Tech-x Corporation
5621 Arapahoe Avenue, Suite A, Boulder, CO, 80303
Hubzone Owned:
N
Woman Owned:
N
Socially and Economically Disadvantaged:
N
Duns:
806486692
Principal Investigator
 Srinath Vadlamani
 Dr
 (303) 996-2034
 srinath@txcorp.com
Business Contact
 Laurence Nelson
Title: Mr
Phone: (720) 974-1856
Email: lnelson@txcorp.com
Research Institution
N/A
Abstract
Extended magnetohydrodynamic (MHD) codes are used to model the large, slow-growing instabilities that are projected to limit the performance of the International Thermonuclear Experimental Reactor (ITER). The multiscale nature of the extended MHD equations requires an implicit approach. However, the current linear solvers needed for the implicit algorithm scale poorly, because the resultant matrices are so ill-conditioned. The most successful scalable parallel processor solvers to date are multigrid solvers; the application of multigrid techniques to a set of equations whose fundamental modes are dispersive waves represents a promising approach. This project will implement the multigrid preconditioners and the Generalized Minimal Residual (GMRES) solver from Lawrence Livermore National Laboratory into extended MHD codes. Phase I will apply existing solver packages to the positive definite matrices in NIMROD, one of the extended MHD codes. Phase II will perform similar testing processes with M3D, another extended MHD code that uses a potential variable formalism on an unstructured grid. Then, the multi-level solvers will be optimized specifically for the extended MHD non-symmetric matrices on high-order finite element grids. Commercial Applications and other Benefits as described by the awardee: A successful development should allow for the efficient usage of future petascale computers at the National Leadership Facilities: Oak Ridge National Laboratory, Argonne National Laboratory, and the National Energy Research Scientific Computing Center.

* information listed above is at the time of submission.

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