OCTO-TIGER: a new, 3D hydrodynamic code for stellar mergers that uses HPX parallelization

Authors

Dominic C. Marcello, Louisiana State Univ, Dept Phys & Astron, Baton Rouge, LA 70803 USA; Louisiana State Univ, Ctr Computat Technol, Baton Rouge, LA 70803 USA
Sagiv Shiber, Louisiana State Univ, Dept Phys & Astron, Baton Rouge, LA 70803 USAFollow
Orsola De Marco, Macquarie Univ, Dept Phys & Astron, Sydney, NSW 2109, Australia; Macquarie Univ, Astron Astrophys & Astrophoton Res Ctr, Sydney, NSW 2109, AustraliaFollow
Juhan Frank, Louisiana State Univ, Dept Phys & Astron, Baton Rouge, LA 70803 USA
Geoffrey C. Clayton, Louisiana State Univ, Dept Phys & Astron, Baton Rouge, LA 70803 USA
Patrick M. Motl, Indiana Univ Kokomo, Sch Sci, Kokomo, IN 46904 USA
Patrick Diehl, Louisiana State Univ, Ctr Computat Technol, Baton Rouge, LA 70803 USAFollow
Hartmut Kaiser, Louisiana State Univ, Ctr Computat Technol, Baton Rouge, LA 70803 USA

Author ORCID Identifier

De Marco, Orsola https://orcid.org/0000-0002-1126-869X Clayton, Geoffrey https://orcid.org/0000-0002-0141-7436 Diehl, Patrick https://orcid.org/0000-0003-3922-8419

Document Type

Article

Publication Date

7-2021

Abstract

OCTO-TIGER is an astrophysics code to simulate the evolution of self-gravitating and rotating systems of arbitrary geometry based on the fast multipole method, using adaptive mesh refinement. OCTO-TIGER is currently optimized to simulate the merger of well-resolved stars that can be approximated by barotropic structures, such as white dwarfs (WDs) or main-sequence stars. The gravity solver conserves angular momentum to machine precision, thanks to a 'correction' algorithm. This code uses firx parallelization, allowing the overlap of work and communication and leading to excellent scaling properties, allowing for the computation of large problems in reasonable wall-clock times. In this paper, we investigate the code performance and precision by running benchmarking tests. These include simple problems, such as the Sod shock tube, as well as sophisticated, full, WD binary simulations. Results are compared to analytical solutions, when known, and to other grid-based codes such as FLASH. We also compute the interaction between two WDs from the early mass transfer through to the merger and compare with past simulations of similar systems. We measure OCTO-TIGER'S scaling properties up to a core count of similar to 80 000, showing excellent performance for large problems. Finally, we outline the current and planned areas of development aimed at tackling a number of physical phenomena connected to observations of transients.

Publication Source (Journal or Book title)

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY

First Page

5345

Last Page

5382

Recommended Citation

Marcello, D. C., Shiber, S., De Marco, O., Frank, J., Clayton, G. C., Motl, P. M., Diehl, P., & Kaiser, H. (2021). OCTO-TIGER: a new, 3D hydrodynamic code for stellar mergers that uses HPX parallelization. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 504 (4), 5345-5382. https://doi.org/10.1093/mnras/stab937