Sökning: "Added damping"

Visar resultat 11 - 15 av 34 uppsatser innehållade orden Added damping.

  1. 11. 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

  3. 12. Experimental Investigation of Added Mass and Damping on a Model Kaplan Turbine for Rotor Dynamic Analysis

    Uppsats för yrkesexamina på avancerad nivå, Luleå tekniska universitet/Institutionen för teknikvetenskap och matematik

    Författare :Timmy Nyman; [2018]
    Nyckelord :Added mass; added damping; rotor dynamics; kaplan turbine; vibrations; fluid dynamics;

    Sammanfattning : The concept of added hydrodynamic properties such as added mass is of importance in modern hydropower development, mainly for rotor dynamic calculations. Added mass could result in reduced natural frequencies and altered mode compared to existing simulation models. LÄS MER

  4. 13. Application of the open sourcecode Nemoh for modelling ofadded mass and damping in shipmotion simulations

    Master-uppsats, KTH/Marina system

    Författare :Emil Andersson; [2018]
    Nyckelord :;

    Sammanfattning : Two different numerical tools were considered, the first one is a seakeeping method developed by KTH Ship Dynamics Research Program. It utilizes strip theory and Lewis forms and is further addressed as SMS. LÄS MER

  5. 14. Experimental Investigation of Hydrodynamic Effects on a Vibrating Kaplan Runner

    Uppsats för yrkesexamina på avancerad nivå, Luleå tekniska universitet/Strömningslära och experimentell mekanik

    Författare :Jakob Hedlund; [2017]
    Nyckelord :FSI; fluid-solid interactions; Kaplan runner; hydrodynamic; added mass; added damping; vibrations;

    Sammanfattning : An experimental investigation of a vibrating Kaplan turbine runner was performed in order to understand the hydrodynamic effects and to obtain or confirm the mass and damping coefficients used for dimensioning at the design stage. Improved design can lead to increased efficiency and lifetime of hydropower stations. LÄS MER

  7. 15. Numerical Investigations of a Partitioned FSI Algorithm for Tetra Pak's Filling Tube

    Master-uppsats, Lunds universitet/Institutionen för energivetenskaper

    Författare :Leo Andersson; [2016]
    Nyckelord :fluid-structure interaction; FSI; added mass effect; partitioned implicit scheme; stability; Rayleigh damping; grid flux under-relaxation; Technology and Engineering;

    Sammanfattning : Numerical simulations of fluid-structure interaction of a water-filled tube with a free surface are conducted using an implicit partitioned coupling scheme. Abaqus and STAR-CCM+ are used for the solid- and fluid domains respectively. This application has stability issues, with the most severe turning out to be the added mass effect. LÄS MER