Modified Monotonicity Preserving Constraints for High-Resolution Optimized Compact Scheme

Ahn, Myeonghwan; Lee, Duck-Joo

doi:10.1007/s10915-020-01221-0

Cited by 6 publications

(2 citation statements)

References 27 publications

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“…We also set the outflow boundaries along all directions. The MHD equations were solved numerically using a highorder shock-capturing adaptive refinement Godunov-type code AMUN 1 with 5 th order optimized compact monotonicity preserving reconstruction of Riemann states (Ahn and Lee, 2020), the HLLD Riemann flux solver (Mignone, 2007), and the 3 rd order 4-step Strong Stability Preserving Runge-Kutta (SSPRK) method (Gottlieb et al, 2011) for time integration. The system was evolved until t 21 c. u.…”

Section: Magnetohydrodynamic Model Of Colliding-wind Binarymentioning

confidence: 99%

Colliding-Wind Binaries as a Source of TeV Cosmic Rays

Kowal

Falceta‐Gonçalves

2021

Front. Astron. Space Sci.

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In addition to gamma-ray binaries which contain a compact object, high-energy and very high–energy gamma rays have also been detected from colliding-wind binaries. The collision of the winds produces two strong shock fronts, one for each wind, both surrounding a shock region of compressed and heated plasma, where particles are accelerated to very high energies. Magnetic field is also amplified in the shocked region on which the acceleration of particles greatly depends. In this work, we performed full three-dimensional magnetohydrodynamic simulations of colliding winds coupled to a code that evolves the kinematics of passive charged test particles subject to the plasma fluctuations. After the run of a large ensemble of test particles with initial thermal distributions, we show that such shocks produce a nonthermal population (nearly 1% of total particles) of few tens of GeVs up to few TeVs, depending on the initial magnetization level of the stellar winds. We were able to determine the loci of fastest acceleration, in the range of MeV/s to GeV/s, to be related to the turbulent plasma with amplified magnetic field of the shock. These results show that colliding-wind binaries are indeed able to produce a significant population of high-energy particles, in relatively short timescales, compared to the dynamical and diffusion timescales.

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Section: Magnetohydrodynamic Model Of Colliding-wind Binarymentioning

confidence: 99%

Colliding-Wind Binaries as a Source of TeV Cosmic Rays

Kowal

Falceta‐Gonçalves

2021

Front. Astron. Space Sci.

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“…The MHD equations were solved numerically using a high-order shock-capturing adaptive refinement Godunov-type code AMUN 1 with 5 th -order Optimized Compact Monotonicity Preserving reconstruction of Riemann states (Ahn and Lee, 2020), the HLLD Riemann flux solver (Mignone, 2007), and the 3 rd -order 4-step Strong Stability Preserving Runge-Kutta (SSPRK) method (Gottlieb et al, 2011) for time integration. The system was evolved until t = 21 c.u.…”

Section: Mhd Model Of Colliding-wind Binarymentioning

confidence: 99%

Colliding-Wind Binaries as a Source of TeV Cosmic Rays

Kowal,

Falceta-Gonçalves

2021

Preprint

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In addition to the gamma-ray binaries which contain a compact object, high energy (HE) and very high energy (VHE) gamma-rays have also been detected from colliding-wind binaries. The collision of the winds produces two strong shock fronts, one for each wind, both surrounding a shock region of compressed and heated plasma, where particles are accelerated to very high energies. Magnetic field is also amplified in the shocked region, on which the acceleration of particles greatly depends. In this work we performed full three-dimensional magnetohydrodynamic simulations of colliding winds, coupled to a code that evolves the kinematics of passive charged test particles subject to the plasma fluctuations. After the run of a large ensemble of test particles with initial thermal distributions we show that such shocks produce a non-thermal population (nearly 1% of total particles) of few tens of GeVs up to few TeVs, depending on the initial magnetization level of the stellar winds. We were able to determine the loci of fastest acceleration, in the range of MeV/s to GeV/s, to be related to the turbulent plasma with amplified magnetic field of the shock. These results show that colliding wind binaries are indeed able to produce a significant population of high energy particles, in relatively short timescales, compared to the dynamical and diffusion timescales.

show abstract

Review of the High-Order TENO Schemes for Compressible Gas Dynamics and Turbulence

2023

Arch Computat Methods Eng

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Modified Monotonicity Preserving Constraints for High-Resolution Optimized Compact Scheme

Cited by 6 publications

References 27 publications

Colliding-Wind Binaries as a Source of TeV Cosmic Rays

Colliding-Wind Binaries as a Source of TeV Cosmic Rays

Colliding-Wind Binaries as a Source of TeV Cosmic Rays

Review of the High-Order TENO Schemes for Compressible Gas Dynamics and Turbulence

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