Numerische Widerstandsprognose

A Navier-Stokes solver has been further developed to compute turbulent free surface model and ship flows. The method allows for the analysis of the complete flow i.e. the generated waves, flow separation, wake distribution, ship resistance and the dynamic sinkage and trim. The implemented method solves the RANS equations in a block structured colocated numerical grid with use of the SIMPLE algorithm and the program has been parallelised to reduce the computational time. The free surface is computed with a Level-Set method and the turbulence is modeled with the k-#omega# model using wall functions. Computations are carried out for different types of ship models and one full scale ship. Most of the results agree well with experimental data, but the used grids are still too course for accurate resistance predictions. For practical application to ship model flow the numerical method is sufficient robust and the grid generation time is reduced to an acceptable level when using a commercial grid generator. Nevertheless the computation of the full scale flow is sensitive to numerical details. (orig.)SIGLEAvailable from TIB Hannover: RN 3150(1642) / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekBundesministerium fuer Bildung und Forschung, Berlin (Germany)DEGerman