A breakthrough astrophysics code, named Octo-Tiger, simulates the evolution of self-gravitating and rotating techniques of arbitrary geometry utilizing adaptive mesh refinement and a brand new technique to parallelize the code to attain superior speeds.
This new code to mannequin stellar collisions is extra expeditious than the established code used for numerical simulations. The analysis got here from a singular collaboration between experimental pc scientists and astrophysicists within the Louisiana State College Division of Physics & Astronomy, the LSU Middle for Computation & Expertise, Indiana College Kokomo and Macquarie College, Australia, culminating in over of a yr of benchmark testing and scientific simulations, supported by a number of NSF grants, together with one particularly designed to interrupt the barrier between pc science and astrophysics.
“Due to a major effort throughout this collaboration, we now have a dependable computational framework to simulate stellar mergers,” stated Patrick Motl, professor of physics at Indiana College Kokomo. “By considerably decreasing the computational time to finish a simulation, we are able to start to ask new questions that might not be addressed when a single-merger simulation was valuable and really time consuming. We are able to discover extra parameter house, look at a simulation at very excessive spatial decision or for longer occasions after a merger, and we are able to lengthen the simulations to incorporate extra full bodily models by incorporating radiative switch, for instance.”
Just lately printed in Month-to-month Notices of the Royal Astronomical Society, “Octo-Tiger: A New, 3D Hydrodynamic Code for Stellar Mergers That Makes use of HPX Parallelisation,” investigates the code efficiency and precision by way of benchmark testing. The authors, Dominic C. Marcello, postdoctoral researcher; Sagiv Shiber, postdoctoral researcher; Juhan Frank, professor; Geoffrey C. Clayton, professor; Patrick Diehl, analysis scientist; and Hartmut Kaiser, analysis scientist, all at Louisiana State College—along with collaborators Orsola De Marco, professor at Macquarie College and Patrick M. Motl, professor at Indiana College Kokomo—in contrast their outcomes to analytic options, when recognized and different grid-based codes, corresponding to the favored FLASH. As well as, they computed the interplay between two white dwarfs from the early mass switch by way of to the merger and in contrast the outcomes with previous simulations of comparable techniques.
“A take a look at on Australia’s quickest supercomputer, Gadi (#25 within the World’s High 500 checklist), confirmed that Octo-Tiger, working on a core rely over 80,000, shows wonderful efficiency for big models of merging stars,” De Marco stated. “With Octo-Tiger, we can not solely scale back the wait time dramatically, however our models can reply many extra of the questions we care to ask.”
Octo-Tiger is presently optimized to simulate the merger of well-resolved stars that may be approximated by barotropic constructions, corresponding to white dwarfs or important sequence stars. The gravity solver conserves angular momentum to machine precision, because of a correction algorithm. This code makes use of HPX parallelization, permitting the overlap of labor and communication and resulting in wonderful scaling properties to unravel giant issues in shorter time frames.
“This paper demonstrates how an asynchronous task-based runtime system can be utilized as a sensible various to Message Passing Interface to assist an vital astrophysical drawback,” Diehl stated.
The analysis outlines the present and deliberate areas of growth geared toward tackling various bodily phenomena linked to observations of transients.
“Whereas our explicit analysis curiosity is in stellar mergers and their aftermath, there are a number of issues in computational astrophysics that Octo-Tiger can handle with its primary infrastructure for self-gravitating fluids,” Motl stated.
The animation was ready by Shiber, who says: “Octo-Tiger exhibits outstanding efficiency each within the accuracy of the options and in scaling to tens of 1000’s of cores. These outcomes reveal Octo-Tiger as a perfect code for modeling mass switch in binary techniques and in simulating stellar mergers.”
Supply:Dominic C Marcello et al, Octo-Tiger: a brand new, 3D hydrodynamic code for stellar mergers that makes use of HPX parallelisation, Month-to-month Notices of the Royal Astronomical Society (2021). DOI: 10.1093/mnras/stab937
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A breakthrough astrophysics code rapidly models stellar collisions
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