Los Alamos National Laboratory

Los Alamos National Laboratory

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Rad-Hydro with a High-Order, Low-Order Method

Highlight of research that formally extended the HO-LO radiation algorithm to include operator-split radiation-hydrodynamics
Ho-Lo comparisons

Heated aluminum shell figures illustrate the statistical noise reduction in material temperatures obtained by using HO-LO Monte Carlo, left, vs. Implicit Monte Carlo, right. The HO-LO solution was nearly twice as fast.

High-order, low-order radiation algorithm enhancements increase calculation speed,
provide substantial accuracy and efficiency

High-Order/Low-Order or “HO-LO” methods for single-physics kinetics problems have been demonstrated at the Laboratory with much success. Recent work indicates that the HO-LO Monte Carlo method will have a very high impact on computational speed and accuracy when fully deployed in Eulerian Application Project (EAP) software.

Because thermal transport is an extremely computationally intensive part of High Energy Density Physics (HEDP) problems, enhancements that bring about substantial speedups and accuracy improvements are essential to solving challenging multiphysics problems while maintaining our design goals of accuracy, efficiency, and robustness.

Summary of full paper (pdf)