Abstract: Shear flows in resonant surfaces of Tokamka devices induced by nonhnear evolution of double tearing modes(DTM) are studied numerically in the framework of resistive magnetohydronamic model with slab geometry.It is found that in early phases of nonlinear evolution of DTM,no remarkable shear flows is generated in resonant surfaces.Effective shear flows emerge during the phase of fast magnetic reconnection and disappear finally.Both amplitude and distribution of shear flows are found vary with nonlinear evolution of magnetic islands.Moreover,by taking into account plasma resistivity,it is shown that greater plasmas resistivity results in faster magnetic reeonection, but it hardly affects shear flows of resonant surfaces in Tokamka devices.

Key words: double tearing modes, magnetic reconnection, shear flow, numerical simulation