The analysis of yacht hulls performance using RANSE based free surface simulations has become an accepted approach over the last decade. Access to this technology has been eased by the development of user-friendly software and by the increase of computational power. Results are widely accepted as superior to previous non-viscous approaches and have to compete with towing tank results in terms of accuracy. However, many practical applications suffer from a numerical smearing of the free surface interface between air and water which can be described as numerical ventilation. This problem occurs when the intersection between bow and calm water surface forms an acute angle and is further pronounced if the stem is rounded or blunt. It is therefore especially linked to sailing yacht applications. The problem manifests itself as a non-physical suction of the air–water mixture under the yacht hull, causing a significant under-prediction of viscous resistance. While this is the easily observable appearance of the problem, a second issue is its effect on wave resistance. It can be shown that wave damping is significantly increased, causing a prediction of wave resistance which is also too low. The paper provides a review of the Volume-of-Fluid method. It discusses the resultant implications for practical applications. A remedy to circumvent the problem is described and its impact on the accuracy of the result is shown. Simulations on an identical appended hull with and without interface smearing are compared. Effects on free surface visualization and numerical accuracy are shown. The paper finishes with a thorough verification and validation of a fully appended yacht in accordance with ITTC standards.


    Zugriff

    Zugriff über TIB

    Verfügbarkeit in meiner Bibliothek prüfen

    Bestellung bei Subito €


    Exportieren, teilen und zitieren



    Titel :

    Advancements in free surface RANSE simulations for sailing yacht applications


    Beteiligte:
    Böhm, Christoph (Autor:in) / Graf, Kai (Autor:in)


    Erscheinungsdatum :

    2014


    Format / Umfang :

    10 Seiten, 13 Quellen




    Medientyp :

    Aufsatz (Konferenz)


    Format :

    Print


    Sprache :

    Englisch




    Sailing yacht

    VICINI OLIVIERO | Europäisches Patentamt | 2018

    Freier Zugriff

    SAILING YACHT

    VICINI OLIVIERO | Europäisches Patentamt | 2018

    Freier Zugriff

    Sailing Yacht

    VICINI OLIVIERO | Europäisches Patentamt | 2019

    Freier Zugriff

    SAILING YACHT

    VICINI OLIVIERO | Europäisches Patentamt | 2017

    Freier Zugriff

    SMART SAILING YACHT

    SEO KWANGCHEOL / LEE GYEONGWOO / KIM SANGWON et al. | Europäisches Patentamt | 2019

    Freier Zugriff