Now showing items 1-20 of 24

    • Alternative manoeuvres to reduce ship scour 

      Castells Sanabra, Marcel·la; Mujal Colilles, Anna; Llull Marroig, Antoni Ignaci; Moncunill Marimon, Jorge; Gironella Cobos, Xavier; Martínez de Osés, Francesc Xavier (Cambridge University Press, 2020-08-03)
      Article
      Open Access
      Scouring and sedimentation effects on the seabed induced by ship propellers during ship manoeuvring near harbour structures affect both structure stability and ship manoeuvring capabilities. This contribution proposes ...
    • Coherent structures in oscillatory flows within the laminar-to-turbulent transition regime for smooth and rough walls 

      Mujal Colilles, Anna; Christensen, Kenneth T.; Bateman Pinzón, Allen; Garcia, Marcelo Horacio (2016-04)
      Article
      Open Access
      We investigate coherent structures present in oscillatory boundary layers over smooth and rough beds for Reynolds numbers between 103 and 104, in the transition to turbulence regime. A two-camera 2D- particle image velocimetry ...
    • Composite methodology to prevent ship propeller erosion 

      Llull Marroig, Antoni Ignaci; Mujal Colilles, Anna; Castells Sanabra, Marcel·la; Gironella Cobos, Xavier (2020-01)
      Article
      Restricted access - publisher's policy
      The jet flow generated by manoeuvring ships nearby vertical structures is known to erode the seabed sediment but is still difficult to predict the effects of a particular ship operating in a harbour basin. This paper ...
    • Dynamics of the rhythmic morphology on the low-energy Trabucador beach (Ebro delta) 

      Mujal Colilles, Anna; Grifoll Colls, Manel; Ribas Prats, Francesca; Falqués Serra, Albert (Consejo Superior de Investigaciones Científicas (CSIC), 2019)
      Conference report
      Open Access
      Observations of rhythmic morphology along the Trabucador beach are contrasted with two numerical models to unravel the mechanisms of their formation. The Trabucador is a long narrow barrier at the SW side of the Ebro ...
    • Erosion caused by propeller jets in a low energy harbour basin 

      Mujal Colilles, Anna; Gironella Cobos, Xavier; Sánchez-Arcilla Conejo, Agustín; Puig i Polo, Càrol; García León, Manuel (2017-01)
      Article
      Open Access
      Field data of a harbour basin are compared with analytical formulations for predicting maximum scouring depth due to propeller jets. Spatial data analysis of seven-year biannual bathymetries quantifies the evolution of the ...
    • Estudi experimental de l'eficiència de la mescla en dipòsits d'abastament d'aigua 

      Mujal Colilles, Anna (Universitat Politècnica de Catalunya, 2008-01-22)
      Minor thesis
      Open Access
      El fenomeno de la mezcla en depósitos de abastecimiento de aguas tiene un efecto directo en la calidad del agua saliente. La creación de zonas de mezcla pobre y la estratificación pueden tener efectos negativos en la ...
    • Estudio del potencial energético de las energías renovables y su impacto en el archipélago de las Perlas (Panamá). Primeras Aproximaciones 

      Castells Sanabra, Marcel·la; Mujal Colilles, Anna; Martínez Parera, Andreu; López, Marilyn (2017-11)
      Article
      Open Access
      The current situation of the inhabitants of the Las Perlas archipélago highlights the lack of energy resources in this area. The study of the energetic potential of renewable energies and their environmental impacts in the ...
    • Hybrid tool to prevent ship propeller erosion 

      Llull Marroig, Antoni Ignaci; Mujal Colilles, Anna; Castells Sanabra, Marcel·la; Gironella Cobos, Xavier; Martínez de Osés, Francesc Xavier; Martín Mallofré, Agustí; Sánchez-Arcilla Conejo, Agustín (American Society of Mechanical Engineers (ASME), 2018)
      Conference report
      Open Access
      The present contribution aims to implement a new methodology to prevent Roll on-Roll off vessels (RO-RO) from causing severe scouring actions. The methodology combines field, experimental, theoretical and numerical tools ...
    • Low energy transverse sand bars at el Trabucador beach, Ebro delta: a preliminary study 

      Mujal Colilles, Anna; Grifoll Colls, Manel; Falqués Serra, Albert (2017)
      Conference report
      Open Access
      The complex rhythmic morphology of the inner side of the Trabucador barrier beach is investigated. This system fea-tures transverse bars along with shoreline undulations. From visual inspection, the typical spacing between ...
    • Manoeuvre analysis and simulation to prevent seabed scour due to ship propellers 

      Mujal Colilles, Anna; Castells Sanabra, Marcel·la; Gironella Cobos, Xavier; Llull Marroig, Antoni Ignaci (Universitat Politècnica de Catalunya. Departament de Ciència i Enginyeria Nàutiques, 2020-09)
      Conference report
      Open Access
      Erosion of the seabed is produced by cargo and passenger vessels when manoeuvring in a harbour basin due to the high-speed jet flow generated by the main propellers. In case of twin propeller vessels, the ability to perform ...
    • Numerical modeling of underwater noise induced by shipping traffic in the Balearic Sea 

      Castro Alves Oliveira, Tiago; Fonollosa Magrinyà, Jordi; Mujal Colilles, Anna (2020)
      Conference report
      Open Access
      We present a novel methodology to model theunderwater noise induced by ship traffic in the Balearic Sea. Inthis regard, a three-dimensional underwater sound propagationmodel is used with realistic time-dependent physical ...
    • PIV applications in vortex rings and oscillatory boundary layers 

      Mujal Colilles, Anna (Universitat Politècnica de Catalunya, 2013-05-13)
      Doctoral thesis
      Open Access
      Particle Image Velocimetry (PIV) is one of the most used experimental techniques in fluid mechanics to obtain the velocity field of a flow. One of its most celebrated characteristics is that it does not have interference ...
    • Rhythmic morphology in a microtidal low-energy beach 

      Mujal Colilles, Anna; Grifoll Colls, Manel; Falqués Serra, Albert (2019-06)
      Article
      Restricted access - publisher's policy
      Observations of rythmic features along the inner side of the Trabucador barrier beach are coupled to two numerical models to unravel the mechanisms of its formation. The Trabucador is a long (6 Km) narrow (125 m) barrier ...
    • Scouring processes in harbour basins during the docking and undocking manoeuvring: laboratory experiments 

      Mujal Colilles, Anna; Gironella Cobos, Xavier; Sánchez-Arcilla Conejo, Agustín (Universidad de Cantabria, 2017-07-25)
      Article
      Open Access
    • Scouring processes in harbour basins during the docking and undocking manoeuvring: laboratory experiments 

      Mujal Colilles, Anna; Gironella Cobos, Xavier; Sánchez-Arcilla Conejo, Agustín (Iniciativa Digital Politècnica, 2016)
      Conference report
      Open Access
    • Ship manoeuvre analysis and simulation to obtain scouring related propeller variables 

      Llull Marroig, Antoni Ignaci; Mujal Colilles, Anna; Gironella Cobos, Xavier; Castells Sanabra, Marcel·la; Martínez de Osés, Francesc Xavier; Martín Mallofré, Agustí; Sánchez-Arcilla Conejo, Agustín (International Centre for Numerical Methods in Engineering (CIMNE), 2018)
      Conference lecture
      Open Access
      The evolution of shipping industry in terms of bigger and more powerful ships, is causing several issues in existing ports and marinas designed, initially, to host smaller vessels with smaller propulsion systems and lower ...
    • Ship manoeuvre patterns to prevent propeller scouring effects 

      Castells Sanabra, Marcel·la; Mujal Colilles, Anna; Llull Marroig, Antoni Ignaci; Gironella Cobos, Xavier; Martínez de Osés, Francesc Xavier; Martín Mallofré, Agustí; Sánchez-Arcilla Conejo, Agustín (World Association for Waterborne Transport Infrastructure (PIANC), 2018)
      Conference report
      Open Access
    • Ship manoeuvring effects on propeller induced erosion 

      Mujal Colilles, Anna; Llull Marroig, Antoni Ignaci; Castells Sanabra, Marcel·la; Gironella Cobos, Xavier; Martínez de Osés, Francesc Xavier; Sánchez-Arcilla Conejo, Agustín (2018)
      Conference report
      Restricted access - publisher's policy
      The shipping industry evolution over the last decades has led to growing structural and operational problems, in particular, for old marinas with lower depths to hosts present ships and with higher drafts and power of ...
    • Stern twin-propeller effects on harbor infrastructures. Experimental analysis 

      Mujal Colilles, Anna; Castells Sanabra, Marcel·la; Llull Marroig, Antoni Ignaci; Gironella Cobos, Xavier; Martínez de Osés, Francesc Xavier (2018-11-02)
      Article
      Open Access
      The growth of marine traffic in harbors, and the subsequent increase in vessel and propulsion system sizes, produces three linked problems at the harbor basin area: (i) higher erosion rates damaging docking structures; ...
    • Study of the bed velocity induced by twin propellers 

      Mujal Colilles, Anna; Gironella Cobos, Xavier; Cabrera Crespo, Alejandro Jacobo; Sánchez-Arcilla Conejo, Agustín (2017-09)
      Article
      Open Access
      Twin propellers without a rudder were studied using a physical model with a fixed clearance distance and three different rotating velocities. Experimental results were compared with results from theoretical expressions ...