Sökning: "ship resistance"

Visar resultat 1 - 5 av 22 avhandlingar innehållade orden ship resistance.

  1. 1. Makt och Motstånd : Bönderna, örlogsflottan och den svenska staten 1522-1640

    Författare :Dan Johansson; Mats Hallenberg; Heiko Droste; Dag Retsö; Stockholms universitet; []
    Nyckelord :HUMANIORA; HUMANITIES; statebuilding; peasant resistance; power resources; shipbuilding; institutions; negotiations; legitimacy; organization; revenue; compliance; entrepreneur; competence; historia; History;

    Sammanfattning : The development of the Swedish state is studied through the central and local organizations that built, repaired, maintained and provisioned the Royal Swedish Navy. The state is viewed as an organization which bargained for resources with powerful social groups. LÄS MER

  3. 2. The Enemy Below - Adhesion and Friction of Ship Hull Fouling

    Författare :Dinis Oliveira; Chalmers tekniska högskola; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; ship resistance; in-water hull cleaning; roughness; biofouling; hull grooming; frictional resistance; adhesion strength; turbulent boundary layer; hull form factor;

    Sammanfattning : Below the waterline, commercial ships are good targets for marine organisms to attach and proliferate, a problem commonly known as biofouling. A fouled hull means higher hydrodynamic resistance, which can result in significant fuel penalties. LÄS MER

  4. 3. Numerical Investigation of Ship Responses in Calm Water and Regular Head Waves

    Författare :Mohsen Irannezhad; Chalmers tekniska högskola; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Nominal wake; Resistance; CFD; RANS; FNPF; Regular head waves; Ship motions;

    Sammanfattning : In order to design fuel efficient ships and install right machinery onboard, ship designers need to know the interaction effects between hull, propeller and appendages in realistic operating conditions. Neglecting the interaction effects may result in under/over-prediction of the required power. LÄS MER

  5. 4. Efficient Full-Scale CFD for Ship Hydrodynamics

    Författare :Michal Orych; Chalmers tekniska högskola; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; NATURVETENSKAP; NATURAL SCIENCES; CFD; Self-propulsion; Ship; Verification; Uncertainty; Full-scale; Validation; Seakeeping; Energy-Saving Device; Roughness; RANS;

    Sammanfattning : An efficient numerical approach for ship hydrodynamics, involving a hybrid free-surface potential flow/RANS method, is explored. The work focuses on estimating the delivered power of ships in calm water and in waves, highlighting the benefits of full-scale simulations, particularly for ships with Energy Saving Devices. LÄS MER

  7. 5. Roughest hour – approaches to ship hull fouling management

    Författare :Dinis Oliveira; Chalmers tekniska högskola; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; vessel performance; fouling control coatings; hull grooming; ship resistance; adhesion strength; in-water hull cleaning; biofouling; roughness; turbulent boundary layer;

    Sammanfattning : Submerged surfaces at sea are colonized by a high diversity of sessile (i.e. attached) life forms. As the merchant fleet capacity increases, responding to growth in demand for seaborne transport, so does the hull wetted surface area that is prone to colonization by these sessile organisms, i. LÄS MER