Now showing items 1-20 of 21

    • 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 ...
    • Boundary conditions for the simulation of localized disturbances on a wind turbine blade 

      Ruscalleda I Cosculluela, Gabriel (Universitat Politècnica de Catalunya, 2025-02-26)
      Bachelor thesis
      Open Access
      Covenantee:   Universität Bremen
      Wind turbine blades are prone to erosion and, as a consequence, surface defects, which trigger early transition to turbulence, leading to performance losses of up to 25%. To inspect surface defects, wind turbines must ...
    • 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, ...
    • Homotopic D2-symmetry breaking of bifurcation scenarios of the four-sided lid driven cavity flow problem 

      Reborido Fuentes, Mencía (Universitat Politècnica de Catalunya, 2024-07-09)
      Master thesis
      Restricted access - confidentiality agreement
      The four-sided lid-driven cavity flow problem is of high interest for two main reasons: it is a benchmark in computational fluid mechanics for validating different numerical solvers of the Navier-Stokes equation, and it ...
    • 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 ...
    • Limit cycles in square cavity flow driven by the simultaneous motion of its four lids 

      Domínguez Pla, Paula (Universitat Politècnica de Catalunya, 2024-10-31)
      Master thesis
      Open Access
      The cavity flow problem is of high interest for two main reasons: it is a benchmark in computational fluid mechanics for validating different numerical solvers of the Navier-Stokes equation, and it acts as a test benchmark ...
    • 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 ...
    • Transition to turbulence of pulsatile flow through a 180º bent pipe 

      Izquierdo Santamaria, Gemma (Universitat Politècnica de Catalunya, 2024-07-10)
      Bachelor thesis
      Open Access
      Covenantee:   Zentrum für angewandte Raumfahrt­technologie und Mikro­gravitation
      Physiological flows in the aorta depend on a lot of factors including the pulsatile nature of the flow, the complex geometries present or the elasticity of the vessels walls among others. The study of these dynamics is of ...
    • 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 pulsatile pipe flow with small curvatures 

      Olivé Almaraz, Dídac (Universitat Politècnica de Catalunya, 2024-07-10)
      Bachelor thesis
      Open Access
      Covenantee:   Universität Bremen
      The presence of irregular flows in our circulatory system may contribute to the development of cardiovascular diseases, which represent a significant threat to human health. Nevertheless, cardiovascular flows are extremely ...