In this work we derive and investigate the properties of approximations of the Becker-Döring equations which aim to capture the behaviour of the problem with a much reduced system of equations. Our schemes are based on a piecewise constant flux approximation, a Galerkin method using a discrete inner product, and a discretisation of a PDE that in turn approximates the Becker-Döring equations. We establish a posteriori error estimates for two of the schemes and report on the results of a representative set of numerical experiments. All three schemes give good results, and the PDE scheme appears to be more efficient than the others.
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