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Explicit finite difference solution for contaminant transport problems with constant and oscillating boundary conditions

For constant and oscillating boundary conditions, the one-dimensional advection-diffusion equation with constant coefficients, which describes a contaminant flow, is solved by the explicit finite difference method in a semi-infinite medium. It is shown how far the periodicity of the oscillating boundary carries on until diminishing to below appreciable levels a specified distance away, which depends on the oscillation characteristics of the source. Results are tested against an analytical solution reported for a special case. The explicit finite difference method is shown to be effective for solving the advection-diffusion equation with constant coefficients in semi-infinite media with constant and oscillating boundary conditions. [Project of the Serbian Ministry of Education, Science and Technological Development, Grant no. 171011]
PAPER REVISED: 2019-10-04
PAPER ACCEPTED: 2019-10-07
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