Numerical simulation of drift turbulence in the presence of sheared flows parallel and perpendicular to the magnetic field

A two-dimensional spectral fluid simulation code is used to study collisional and parallel sheared flow (Vparallel) driven drift wave turbulence and investigate the effects of both poroidal and toroidal shear flows on drift turbulent fluctuations. The background velocity profiles Vparallel and Vy are allowed to evolve with time and a neo-classical term is added to the evolution of the Vy(x,t) and Vparallel(x,t) profiles. The results show that with inclusion of the neoclassical term, the background velocity profiles Vparallel and Vy rapidly generate strong shear flow which significantly suppresses turbulent fluctuations and reduces the Reynolds stress and the flux . The vorticity equation is considered with and without the presence of a scalar nonlinearity due to the Te(x) profile