Computation of flow electrification in oil pipes is studied.The charge transportation equation in turbulent flows is a convection-dominated convection diffusion reaction equation.An operator-splitting scheme is introduced to solve this equation.In the scheme,the equation is split into a pure convection equation,a pure diffusion equation and a pure reaction equation.They are solved by a characteristics method and a finite difference method,respectively.Numerical examples show that this scheme describes the charge distribution in a pipe.A reliable method for streaming current is obtained.