Sökning: "added wave resistance"

Visar resultat 1 - 5 av 6 uppsatser innehållade orden added wave resistance.

  1. 1. Probabilistic Added Wave Resistance Predictions for Design of RoPax Ferries

    Master-uppsats, KTH/Lättkonstruktioner, marina system, flyg- och rymdteknik, rörelsemekanik

    Författare :Jonathan Viinikka; [2023]
    Nyckelord :Added wave resistance in head waves; Roll-on Roll-off Passenger ferry; Probabilistic wave environment; Semi-empirical method; Adderat vågmotstånd i motsjö; Roll-on Roll-off Passagerar Fartyg; Probabilistiska vågförhållanden; Semiempiriska beräkningsmethoder;

    Sammanfattning : This thesis investigates reasons for significant uncertainties in added wave resistance predictionsand how wave conditions can potentially affect the design of RoPax ferries. The objectiveis to find a suitable prediction method of added wave resistance for the RoPax ferry designapplication. LÄS MER

  3. 2. Efficient seakeeping performance predictions with CFD

    Master-uppsats, KTH/Marina system

    Författare :Benjamin Lagemann; [2019]
    Nyckelord :added wave resistance; CFD; Courant-adapted time step; Euler ˛flow; FINE Marine; inviscid flow; k-ω SST-Menter; KVLCC2; RANS; regular waves; seakeeping; sub-cycling acceleration; time discretization; viscous flow;

    Sammanfattning : With steadily increasing computational power, computational fluid dynamics (CFD) can be applied to unsteady problems such as seakeeping simulations. Therefore, a good balance between accuracy and computational speed is required. LÄS MER

  4. 3. Parametric Hull Form Variation and Assessment of Seakeeping Performance

    Master-uppsats, KTH/Marina system

    Författare :Aina Pons Roser; [2018]
    Nyckelord :;

    Sammanfattning : This Master Thesis is about the assessment of the seakeeping performance of different ships subjected to hull parametric variations. The latest version of the potential flow CFD software Shipflow in combination with a CAD platform (CAESES) have been used to carry out the evaluations. LÄS MER

  5. 4. Comparison of Idealized 1D and Forecast 2D Wave Spectra in Ship Response Predictions

    Master-uppsats, KTH/Marina system

    Författare :Lars Björnsson; [2013]
    Nyckelord :;

    Sammanfattning : Commonly, when calculating ship responses one uses idealized wave spectra to represent the sea. In the idealized model, the sea is frequently assumed to consist of swell and windwaves, which are usually represented by idealized 1D wave spectra, and the directionality of wind-waves is accounted for by multiplication with a standard spreading function. LÄS MER

  7. 5. Determining the pressure distribution on submerged 2D bodies using dissipative potential flow.

    Master-uppsats, KTH/Marina system

    Författare :Mirjam Fürth; [2011]
    Nyckelord :;

    Sammanfattning : Globalization is reaching the furthest corners of the world and with globalizations comes a rising demand on transportation. In shipping; a significant cost both to the ship owners and the environment are the fossil fuels used for propulsion, even a small reduction in the wave resistance can bring considerable reductions both in operating costs and emissions for such ships. LÄS MER