SEARCH · Search NASA
Results for “Solver”
Search indexed NASA NTRS and DOE OSTI research on propulsion, heat transfer, battery materials and energy systems. Follow report and document links to the original sources.
Quote a phrase for an exact phrase match. Source license links do not imply unrestricted reuse.
GALINI: An extensible mixed-integer quadratically-constrained optimization solver.
Abstract not provided.
thornado-transport: Anderson- and GPU-accelerated nonlinear solvers for neutrino-matter coupling
Algorithms for neutrino-matter coupling in core-collapse supernovae (CCSNe) are investigated in the context of a spectral two-moment model, which is discretized in space with the discontinuous Galerkin method, integrated in time with implicit-explicit (IMEX) methods, and implemented in the toolkit for high-order neutrino-radiation hydrodynamics (thornado). The model considers electron neutrinos and antineutrinos and tabulated opacities from Bruenn (1985), which includes neutrino-electron scattering and pair processes. The nonlinear system arising from implicit time discretization of the equations governing neutrino-matter coupling is iterated to convergence using Anderson-accelerated fixed-point methods, which avoid formation of Jacobians and inversion of dense linear systems. Numerical experiments show that, for a given tolerance, a nested iteration scheme which aims to reduce opacity evaluations can lower the computational cost. Our initial port to GPUs, using both OpenMP and OpenACC, shows an overall speedup of up to ~ 100× when compared to results using a single CPU core. These results indicate that the algorithms implemented in thornado are well-suited to GPU acceleration.
Linear and Nonlinear Solvers for Simulating High-Temperature Multiphase Flow Within Large-Scale Engineered Subsurface Systems.
Abstract not provided.
ADELUS: A Performance-Portable Dense LU Solver for Distributed-Memory Hardware-Accelerated Systems.
Abstract not provided.
IMPLEMENTATION OF THE ENERGY EQUATION SOLVER TO THE LATTICE BOLTZMANN METHOD-BASED CODE PRATHAM
Explore the source record for details and available documents.
Improving numerical solvers for enabling extended-term simulations to better understand the impact of rapidly increasing renewable generation on the grid.
Abstract not provided.
Incorporating Multiple Compute Precisions into the GMRES Linear Solver.
Abstract not provided.
Space-time solvers for incompressible flow
Explore the source record for details and available documents.
Neural Network Solver for Coherent Synchrotron Radiation Wakefield Calculations in Accelerator-Based Charged Particle Beams
Explore the source record for details and available documents.
Linear & Nonlinear Solvers for Simulating High-Temperature Multiphase Flow Within Large-scale Engineered Subsurface Systems.
Abstract not provided.
Accelerated Deployment of MFEM Based Solvers in Large Scale Industrial Problems
Explore the source record for details and available documents.
A Neural PDE Solver with Temporal Stencil Modeling
Explore the source record for details and available documents.
Parallel Training of GRU Networks with a Multi-Grid Solver for Long Sequences.
Abstract not provided.