Now showing items 1-16 of 16

    • Análisis de estabilidad Arnoldi de las ondas de Tollmien-Schlichting en fluidos viscosos 

      Montañez Fabrés, Raquel (Universitat Politècnica de Catalunya, 2017-07)
      Bachelor thesis
      Open Access
      En este trabajo se estudia la estabilidad de las ondas Tollmien-Schlichting, que aparecen como una primera fase de la inestabilidad del flujo de Poiseuille plano como paso de laminar a turbulento. Se calcula la curva de ...
    • Arnoldi Stability Analysis of Modulated Tollmien-Schlichting Waves in Shear Flows 

      Santigosa, Marc; Abril, Oriol (Universitat Politècnica de Catalunya, 2015)
      Coursework
      Open Access
      The transition of strictly two-dimensional Poiseuille flow from one-frequency amplitude-modulated states to chaotic behaviour is studied through full numerical simulation of spatially periodic channels with large longitudinal ...
    • Assessing the physics of models for transition in pipe flow 

      Cela París, José María (Universitat Politècnica de Catalunya, 2022-07-06)
      Bachelor thesis
      Open Access
      Covenantee:   Universität Bremen / Zentrum für angewandte Raumfahrt­technologie und Mikro­gravitation
      Transition to turbulence in pipe flow is a long standing problem in the field of turbulence research. In the route to fully turbulent pipe flow, turbulence presents itself in a wide variety of forms. In recent years, a ...
    • Characterization of localized solutions of plane Poiseuille flow in very long domains 

      Valera Pascual, Antonio (Universitat Politècnica de Catalunya, 2016-05-24)
      Bachelor thesis
      Open Access
      The aim of this Bachelor's Thesis is the study of a particular low-energy localized plane Poiseuille solution while minimizing the error introduced by the streamwise periodicity boundary condition. The fact that the ...
    • Computació de fluxos preturbulents bidimensionals al problema de Poiseuille pla 

      Rota Cunill, Joan (Universitat Politècnica de Catalunya, 2012-05-15)
      Minor thesis
      Open Access
      La inestabilitat dels fluxos i la transició a la turbulència són fenòmens estesos a l’enginyeria i el medi natural. El problema de Poiseuille és un dels escenaris típics en dinàmica de fluids on la transició de flux lamina ...
    • Digital control of pre-turbulent flows in a Taylor-Couette device 

      Gil Bofill, Núria (Universitat Politècnica de Catalunya, 2019-07-09)
      Bachelor thesis
      Open Access
      Transition to turbulence is one of the oldest problems yet to be solved in physics and engineering. Certain fluid systems are known to undergo a laminar-turbulent transition through a deterministic route of laminar flows ...
    • Dinàmica d'ions a la magnetosfera de la Terra 

      Contreras Molina, Gerard (Universitat Politècnica de Catalunya, 2020-07)
      Bachelor thesis
      Open Access
      En aquest treball s'explora el problema de Störmer. Aquest tracta de l'estudi de les trajectòries dels ions en influència del camp magnètic terrestre. S'ha dut a terme a partir de l'expressió del lagrangià de la partícula ...
    • Exact coherent structures in the transitional regime of shear and centrifugal flows 

      Ayats López, Roger (Universitat Politècnica de Catalunya, 2022-04-22)
      Doctoral thesis
      Open Access
      Turbulence is one of the major concerns for most technological problems involving fluid motion. Specially in aeronautics, a turbulent boundary layer results in structural stresses, vibrations and higher aircraft drag, ...
    • Large eddy simulation of the combustion in an oxygen-paraffin hybrid rocket engine 

      Homs Pons, Carme (Universitat Politècnica de Catalunya, 2019-06)
      Bachelor thesis
      Open Access
      Covenantee:   Zentrum für angewandte Raumfahrt­technologie und Mikro­gravitation
      En la última década se ha despertado un renovado interés en los cohetes híbridos debido a su bajo precio, manejo seguro y compatibilidad con carburantes verdes. Un grupo de estudiantes está desarrollando un cohete híbrido ...
    • Modelling the cardiovascular system: pulsating flow through a collapsible channel 

      Cabanes Bosacoma, Xavier (Universitat Politècnica de Catalunya, 2017-05)
      Bachelor thesis
      Open Access
      The interaction between fluid flows and the deformation of solid structures is important in many engineering applications, as in turbochargers, wind turbines or airplane wings. The flow of blood in the body is also an ...
    • Non-linear fluid dynamics in oscillatory cylindrical cavities 

      Panadès i Guinart, Carles (Universitat Politècnica de Catalunya, 2013-06-28)
      Doctoral thesis
      Open Access
      Even though the transition to turbulence has been studied for over a century, its complete comprehension still remains unclear even for the simplest flows and continues to be a daunting challenge for the scientific community. ...
    • Periodically forced extensional pipe flow 

      Bahí Buhígas, Roger (Universitat Politècnica de Catalunya, 2020-07)
      Bachelor thesis
      Open Access
      This project studies the flow of a fluid inside an infinite pipe with periodically forced extensional walls in the axial direction. The Navier-Stokes equations for an incompressible fluid inside the pipe are solved to ...
    • Study of the effect of viscosity in drop breakup in turbulent flow 

      Fernández Stolpa, Lucas (Universitat Politècnica de Catalunya, 2021-07-12)
      Bachelor thesis
      Open Access
      Covenantee:   Universität Bremen
      The systems formed by two immiscible liquids such as emulsions are of great interest in industrial processes, the emulsion formation process occurs depending on the phenomenon of the breakup of the drops of one of the ...
    • The Kuramoto-Sivashinsky equation 

      Ayora Mexia, Marcel; Pedret Sagnier, Berta; Tudoras Miravet, Àlex (Universitat Politècnica de Catalunya, 2021-06-04)
      Coursework
      Open Access
      The Kuramoto-Sivanshinsky equation is studied thoroughly by numerical integration. The rst section demonstrates the study's motivation and historical relevance. Rigorous mathematical analy- sis is made on how to approach ...
    • Transitional coherent structures in shear and centrifugally driven flows 

      Wang, Baoying (Universitat Politècnica de Catalunya, 2023-09-21)
      Doctoral thesis
      Open Access
      (English) Turbulence is not only omnipresent in our daily lives but also in engineering applications. However, not until the middle of the XXth century researchers began to realize that simple, relatively large-scale ...
    • Turbulence transition in pulsating pipe flow: shear-thinning effects 

      Dot Casadevall, Laura (Universitat Politècnica de Catalunya, 2021-07-12)
      Bachelor thesis
      Open Access
      Covenantee:   Universität Bremen
      In the last years the major cause of death worldwide has turned out to be because of cardiovascular diseases; for instance, owing to the presence of blood turbulence in our vessels. The problem has already been addressed ...