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physics.plasm-ph2024
Unified mesoscale picture of nonlinear generation of zonal flows in toroidal geometry
Zihao Wang, Shaojie Wang
Recent experimental findings on limit-cycle-oscillations indicate that the nonlinear driving of the turbulent poloidal Reynolds stress to zonal flows is not a significant factor in…
physics.plasm-ph2024
Numerical dissipation induced by the low-pass filtering in nonlinear gyrokinetic simulations
Zihao Wang, Shaojie Wang
De-aliasing is an essential procedure for eliminating the aliasing error in nonlinear simulations, such as nonlinear gyrokinetic turbulence simulations. An ideal approach to de-ali…
physics.comp-ph2024
Discretization form of the continuity condition at the polar axis, with application to the gyrokinetic simulation in a magnetic fusion torus
Tiannan Wu, Zihao Wang, Shaojie Wang
A new computational method to solve the hyperbolic (Vlasov) equation and the elliptic (Poisson-like) equation at the polar axis is proposed. It is shown that the value of a scalar…