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Visar resultat 6 - 10 av 102 avhandlingar som matchar ovanstående sökkriterier.

  1. 6. Computational Modelling for Cavitation and Tip Vortex Flows

    Författare :Abolfazl Asnaghi; Chalmers tekniska högskola; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; NATURVETENSKAP; NATURAL SCIENCES; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Cavitation; SST k − ω; OpenFOAM; Propeller; LES; Numerical simulation; Cur- vature correction; Elliptical foil; Inception; Twisted Delft foil;

    Sammanfattning : Cavitation often brings negative effects, such as performance degradation, noise, vibration, and material damage, to marine propulsion systems, but for optimum performance, cavitation is almost inevitable. Therefore, it is necessary to better understand cavitation in order to maximize the performance without encounter- ing severe problems. LÄS MER

  3. 7. LES stochastic modelling of cavitation with its applications in OpenFOAM

    Författare :Boxiong Chen; Chalmers tekniska högskola; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Rayleigh-Plesset Equation; Cavitation; Modelling; Simulation; Eulerian Stochastic Field Method; OpenFOAM; Homogeneous Equilibrium Model;

    Sammanfattning : Cavitation is a vaporization process that commonly happens in high-pressure injector nozzles nowadays. It has been shown by previous studies that cavitation has a significant influence on the subsequent atomization process, the quality of which would in turn heavily affect the process of combustion. LÄS MER

  4. 8. LES stochastic modelling of cavitation with its applications in OpenFOAM

    Författare :Boxiong Chen; Chalmers tekniska högskola; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; Cavitation; Rayleigh-Plesset Model; Simulation; OpenFOAM; Volume of Fluid Method; Modeling;

    Sammanfattning : Cavitation is a vaporisation process that commonly happens in high pressure injectornozzles nowadays. It has been shown by previous studies that cavitationhas a significant influence on the subsequent atomization process, the qualityof which would in turn heavily affect the quality of combustion. LÄS MER

  5. 9. Developing Computational Methods for Detailed Assessment of Cavitation on Marine Propellers

    Författare :Abolfazl Asnaghi; Chalmers tekniska högskola; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; LES; OpenFOAM; Numerical simulation; Hydrodynamics; Cavitation;

    Sammanfattning : Cavitation often brings negative effects, such as performance degradation, noise, vibration, and material damage, to a marine propulsion systems, but for optimum performance, cavitation is almost inevitable. Therefore, it is necessary to improve the understanding of cavitation in order to maximize the performance without encountering severe problems. LÄS MER

  7. 10. Adaptive Finite Element Methods for the Reynolds Thin Film Model with Cavitation

    Författare :Bertil Nilsson; Sweden Gothenburg Chalmers University of Technology Department of Applied Mechanics; []
    Nyckelord :tribology; Reynolds equation; cavitation; FEM; adaptivity; variational inequality; penalty formulation; error estimation; residual; duality;

    Sammanfattning : The main purpose of this thesis is to use modern goal-oriented adaptive finite element techniques in order to improve the numerical simulation of tribology. Two novel adaptive finite element methods for the Reynolds thin film model including cavitation are presented and their different strategies are compared. LÄS MER