Numerical studies of MHD turbulence in the reversed field pinch

Nonlinear numerical studies of the MHD turbulence generated in an RFP configuration are presented. In these computations the resistive MHD equations are solved by using a three-dimensional semi-implicit spectral code. While a qualitative picture of the global RFP behaviour is readily obtained, the possibility of obtaining reliable results for Reynolds numbers of practical interest is a major problem. For this reason particular attention is placed on the convergence properties of the spectral methods. Furthermore, preliminary results on the dependence of the fluctuations on the Reynolds numbers are given. (orig.)