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In finite-volume-based flow-simulations with free-surface waves, wavereflections at the domain boundaries can cause substantial errors in theresults and must therefore be minimized. This can be achieved via `implicitrelaxation zones', but only if the relaxation zone's case-dependent parametersare optimized. This work proposes an analytical approach for optimizing theseparameters. The analytical predictions are compared against results from2D-flow simulations for different water depths, flow solvers, and relaxationfunctions, and against results from 3D-flow simulations with stronglywave-reflecting bodies subjected to nonlinear free-surface waves. The presentresults demonstrate that the proposed approach satisfactorily predicts both theoptimum parameter settings and the upper-limit for the corresponding reflectioncoefficients $C_{\mathrm{R}}$. Simulation results for $C_{\mathrm{R}}$ weremostly below or equal to the analytical predictions, but never more than$3.4\%$ larger. Therefore, the proposed approach can be recommended forengineering practice. Furthermore, it is shown that implicit relaxation zonescan be considered as a special-case of forcing zones, a family of approacheswhich includes among others absorbing layers, damping zones and sponge layers.The commonalities and differences between these approaches are discussed,including to what extend the present findings are applicable to these otherapproaches and vice versa.

Optimizing wave-generation and wave-damping in 3D-flow simulations with implicit relaxation-zones