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Author Umeda, Takayuki ♦ Yamauchi, Natsuki ♦ Wada, Yasutaka ♦ Ueno, Satoshi
Source United States Department of Energy Office of Scientific and Technical Information
Content type Text
Language English
Subject Keyword PLASMA PHYSICS AND FUSION TECHNOLOGY ♦ ANISOTROPY ♦ APPROXIMATIONS ♦ COMPARATIVE EVALUATIONS ♦ COMPUTERIZED SIMULATION ♦ DISTRIBUTION FUNCTIONS ♦ EQUATIONS OF MOTION ♦ FLUIDS ♦ HELMHOLTZ INSTABILITY ♦ LARMOR RADIUS ♦ MAGNETIC FIELDS ♦ MAGNETOHYDRODYNAMICS ♦ PRESSURE GRADIENTS ♦ TENSORS ♦ VELOCITY ♦ VISCOSITY
Abstract In the present paper, the finite-Larmor-radius (gyro-viscous) term [K. V. Roberts and J. B. Taylor, Phys. Rev. Lett. 8, 197–198 (1962)] is evaluated by using a full kinetic Vlasov simulation result of the Kelvin-Helmholtz instability (KHI). The velocity field and the pressure tensor are calculated from the high-resolution data of the velocity distribution functions obtained by the Vlasov simulation, which are used to approximate the Finite-Larmor-Radius (FLR) term according to Roberts and Taylor [Phys. Rev. Lett. 8, 197–198 (1962)]. The direct comparison between the pressure tensor and the FLR term shows an agreement. It is also shown that the anisotropic pressure gradient enhanced the linear growth of the KHI when the inner product between the vorticity of the primary velocity shear layer and the magnetic field is negative, which is consistent with the previous FLR-magnetohydrodynamic simulation result. This result suggests that it is not sufficient for reproducing the kinetic simulation result by fluid simulations to include the FLR term (or the pressure tensor) only in the equation of motion for fluid.
ISSN 1070664X
Educational Use Research
Learning Resource Type Article
Publisher Date 2016-05-15
Publisher Place United States
Journal Physics of Plasmas
Volume Number 23
Issue Number 5


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