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Abstract: Viscous computations are usually rather time consuming not only in the flow simulation but also in the preprocessing, namely the geometry preparation. Especially the later is an exclusion criterion for the application of these methods during the early design process, connected with the pre-contract stage. In this stage hull forms variants might be developed faster than can be discretized and assessed with such tools. Only highly specialized tools in a streamlined process chain are capable to mend this handicap. Such a process chain is available at the participant institutes, where emphasis is given to efficient interfaces between tools. Additionally the condensed knowledge of viscous computation performed is provided in parameter recommendations for the case setup. This paper presents the results of a bossing design optimization of a fast RoRo vessel, which was executed during the early design phase of the project.