Chad Meyer

Multigroup Thermal Radiation Transport with Tensor Trains

Aditya Deshpande, Patrick D. Mullen, Alex Gorodetsky, Joshua C. Dolence et autres

We investigate the application of tensor-train (TT) algorithms to multigroup thermal radiation transport (i.e., photon radiation transport). The TT framework enables simulations at discretizations that might otherwise be computationally infeasible on conventional hardware. We show that solutions to certain multigroup problems possess …

Multigroup Thermal Radiation Transport with Tensor Trains

Aditya Deshpande, Patrick D. Mullen, Alex Gorodetsky, Joshua C. Dolence et autres

We investigate the application of tensor-train (TT) algorithms to multigroup thermal radiation transport (i.e., photon radiation transport). The TT framework enables simulations at discretizations that might otherwise be computationally infeasible on conventional hardware. We show that solutions to certain multigroup problems possess …

us, cn (code pays fourni par la source)

Thermal Radiation Transport with Tensor Trains

Alex Gorodetsky, Patrick D. Mullen, Aditya Deshpande, Joshua C. Dolence et autres

Abstract We present a novel tensor network algorithm to solve the time-dependent, gray thermal radiation transport equation. The method invokes a tensor train (TT) decomposition for the specific intensity. The efficiency of this approach is dictated by the rank of the decomposition. …

us (code pays fourni par la source)

Singularity-EOS: Performance Portable Equations of State and Mixed Cell Closures

Jonah Miller, Daniel Holladay, Jeffrey H. Peterson, Christopher Mauney et autres

We present Singularity-EOS, a new performance-portable library for equations of state and related capabilities. Singularity-EOS provides a large set of analytic equations of state, such as the Gruneisen equation of state, and tabulated equation of state data under a unified interface. It …

us, de (code pays fourni par la source)

A block-spectral adaptive H-/p-refinement strategy for shock-dominated problems

Vaibhav Rajora, Tariq D. Aslam, Wesley W. Chapman, Chad Meyer et autres

us (code pays fourni par la source)

Super-time-stepping An explicit integration scheme for moderately stiff parabolic operators

Chad Meyer

What is Super Time Stepping?• STS is a broad class of methods, or a set of approaches to integrating the ODEs that result from the discretization of parabolic PDEs • It is a subset of the Runge-Kutta methods understood broadly• Hallmark is …

us (code pays fourni par la source)

A Block-Spectral Adaptive H-/P- Refinement Strategy for Shock-Dominated Problems

Vaibhav Rajora, Tariq D. Aslam, Wesley W. Chapman, Chad Meyer et autres

us (code pays fourni par la source)

Computational Models of Molecular Clouds -- Connection with Observation and Theory

Chad Meyer

The physical processes involved in star formation are not completely understood and are hotly debated in the literature. Star formation occurs in molecular clouds, which are turbulent, dense environments with strong magnetic fields and very low ionization fractions. Early models of star …

A description of multi-material hydrodynamics without reliance upon Pressure-Temperature-Equilibrium and its relevance to Eulerian codes [Slides]

Chad Meyer

This report contains "a description of the full multi-material Euler system without reliance on the assumption of the PTE closure; a discussion of the details that a numerical scheme discretizing the above system might need to have; a description of how that …

us (code pays fourni par la source)

Spiner: Performance Portable Routines for Generic, Tabulated, Multi-Dimensional Data

Jonah Miller, Daniel Holladay, Chad Meyer, Joshua C. Dolence et autres

We present Spiner, a new, performance-portable library for working with tabulated data.Spiner provides efficient routines for multi-dimensional interpolation and indexing on both CPUs and GPUs-as well as more exotic hardware-including interwoven interpolation and indexing access patterns, as needed for radiation transport.Importantly, Spiner …

us (code pays fourni par la source)

Super-time-stepping schemes for parabolic equations with boundary conditions

Timothy Skaras, Torrey Saxton, Chad Meyer, Tariq D. Aslam

us (code pays fourni par la source)

(U) Assessment of new hydrodynamics capabilities in EAP codes to support DSW applications (L2 Milestone Review) [Slides]

Joshua C. Dolence, Office of Defense Programs (DP) USDOE National Nuclear Security Administration (NNSA), James Brethour, Joann M. Campbell et autres

The agenda for the presentation is: introduction and overview; method description; Hydrodynamics problems; LED multi-physics problems; HED multi-physics problems; Kokkos port for ATS-1 and ATS-2; Summary and future work; and, Wrap-up.

us (code pays fourni par la source)