Numeric calculation of turbulent diffusion

A simple, flexible method involving a random number generator is given for simulating time dependent dispersion. The diffusion is simulated by letting a series of particles move with the local mean wind plus random fluctuations of this wind. This simulation method is not greatly complicated by introduction of horizontal and vertical shear, buoyancy, or anisotropic turbulence, and generally requires less computer time and storage than needed for finite difference computations of comparable accuracy over a network of fixed grid points. Solutions of particular cases compare well with known solutions.