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Effects of multiple driving scales on incompressible turbulence
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  • Effects of multiple driving scales on incompressible turbulence
  • Effects of multiple driving scales on incompressible turbulence
저자명
유현주,조정연,Yoo. Hyun-Ju,Cho. Jung-Yeon
간행물명
천문학회보
권/호정보
2012년|37권 1호|pp.75-75 (1 pages)
발행정보
한국천문학회
파일정보
정기간행물|ENG|
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이 논문은 한국과학기술정보연구원과 논문 연계를 통해 무료로 제공되는 원문입니다.
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기타언어초록

Turbulence is ubiquitous in astrophysical fluids such as the interstellar medium and intracluster medium. To maintain turbulent motion, energy must be injected into the fluids. In turbulence studies, it is customary to assume that the fluid is driven on a scale, but there can be many different driving mechanisms that act on different scales in astrophysical fluids. We expect different statistical properties of turbulence between turbulence with single driving scale and turbulence with double driving scales. In this work, we perform 3-dimensional incompressible MHD turbulence simulations with energy injection in two ranges, 2<k< ${surd}$12 (large scale) and 15<k<26 (small scale). We separated into two parts, which are fixed large scale driving and fixed small scale driving. In case of fix large scale driving, two peaks appear in kinetic energy spectrum when the energy injection rate on small scale are comparable to that on large scale. On the other hands, in case of fixed small scale driving we can find two peaks even the energy injection rate on large scale is much smaller that that on small scale. On time evolution of magnetic energy densities in fixed small scale driving case, there seems to be a threshold of energy injection rate.