title: Energy cascade and its locality in compressible magnetohydrodynamic turbulence.
abstract: We investigate energy transfer across scales in three-dimensional compressible magnetohydrodynamic (MHD) turbulence, a model often used to study space and astrophysical plasmas. Analysis shows that kinetic and magnetic energies cascade conservatively from large to small scales in cases with varying degrees of compression. With more compression, energy fluxes due to pressure dilation and subscale mass flux are greater, but conversion between kinetic and magnetic energy by magnetic line stretching is less efficient. Energy transfer between the same fields is dominated by local contributions regardless of compressive effects. In contrast, the conversion between kinetic and internal energy by pressure dilation is dominated by the largest scale contributions. Energy conversion between the velocity and magnetic fields is weakly local.
authors.affiliation: State Key Laboratory for Turbulence and Complex Systems, Center for Applied Physics and Technology, College of Engineering, Peking University, Beijing 100871, People's Republic of China.|Department of Physics and Astronomy, University of Delaware, Newark, Delaware 19716, USA.
authors.forename: Yan
authors.initials: Y
authors.lastname: Yang
authors.affiliation: State Key Laboratory for Turbulence and Complex Systems, Center for Applied Physics and Technology, College of Engineering, Peking University, Beijing 100871, People's Republic of China.
authors.forename: Yipeng
authors.initials: Y
authors.lastname: Shi
authors.affiliation: Department of Mechanics and Aerospace Engineering, South University of Science and Technology of China, Shenzhen, Guangdong 518055, People's Republic of China.
authors.forename: Minping
authors.initials: M
authors.lastname: Wan
authors.affiliation: Department of Physics and Astronomy, University of Delaware, Newark, Delaware 19716, USA.
authors.forename: William H
authors.initials: WH
authors.lastname: Matthaeus
authors.affiliation: State Key Laboratory for Turbulence and Complex Systems, Center for Applied Physics and Technology, College of Engineering, Peking University, Beijing 100871, People's Republic of China.|Department of Mechanics and Aerospace Engineering, South University of Science and Technology of China, Shenzhen, Guangdong 518055, People's Republic of China.|Collaborative Innovation Center of Advanced Aero-Engine, Beijing 100191, People's Republic of China.
authors.forename: Shiyi
authors.initials: S
authors.lastname: Chen