Momentum transport in full-f gyrokinetic simulations

full-fジャイロ運動論シミュレーションにおける運動量輸送

井戸村 泰宏   ; Jolliet, S.*

Idomura, Yasuhiro; Jolliet, S.*

Momentum transport in full-f gyrokinetic simulations is discussed. Accuracy issues of momentum transport in gyrokinetic simulations are studied using a full-f gyrokinetic Eulerian code GT5D. Test calculations in the axisymmetric limit and in turbulent tokamak show that toroidal angular momentum is conserved and that momentum transport and related radial electric fields are correctly computed. Comparisons of ion temperature gradient driven turbulence with and without adaptive momentum sources, which cancel a flow generation, show that momentum transport tends to suppress heat transport by enhancing radial electric field shear, which is connected with rotation profiles through a force balance relation. An existence of residual stress is also identified in the latter simulation.