|Title: Optimization of Appendages Using RANS-CFD-Methods|
|Written by: Hendrik Vorhölter|
|in: NuTTS, Hamburg 2007|
Abstract: There has been a lot of development on RANSCFD- methods in the past years. The codes are more accurate and faster computers allow computations on finer grids in less time. These new capabilities are widely used in research and development. However, in practical ship design RANS-CFDmethods are not commonly used. On the contrary it is still assumed that the effort for RANS-simulations, i.e. grid generation, computational time and interpretation of the results, is still beyond the economical benefit. The following work presents a proposal on how modern RANS-CFD-methods can be used in the early phase of ship design. A process chain is described which combines the CAD-system for ship design E4, the finite volume grid generator HEXPRESS and an arbitrary CFD-code (in this case COMET). The process is presented by the example of a modern ferry design. The shipÂ´s wake field is computed for different designs of appendages. The results are compared to model tests. Finally the tool is used for a redesign of the appendages in order to improve the wake field.