An efficient method of random walk particle tracking: accuracy and resolution
نویسندگان
چکیده
This paper describes an efficient random walk particle tracking (RWPT) method for finite element models in two dimensions. The method for interpolation of global node based velocities for unstructured grids and the implementation of the RWPT are described. The RWPT method is verified using published results of particle path lines to verify the calculation of the velocity field. RWPT transport results obtained with this method are also verified using an analytical solution. Furthermore, the accuracy of the RWPT method in terms of the number of particles required to guarantee reliable solutions is investigated for both homogeneous and heterogeneous aquifers. It is found that a similar number of particles is needed in both cases to achieve a comparable accuracy. Compared to prior results by Hassan and Mohamed [2003], the number of particles used could be decreased by about two orders of magnitude, which indicates the method suggested is efficient for this kind of problem.
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