http://hdl.handle.net/2117/3998 Thu, 23 May 2013 10:39:50 GMT 2013-05-23T10:39:50Z webmaster.bupc@upc.edu Universitat Politècnica de Catalunya. Servei de Biblioteques i Documentació no http://hdl.handle.net/2117/18852 Title: Analysis of the dynamic response of pump-turbine runners. Part I: Experiment Authors: Presas Batlló, Alexandre; Valero Ferrando, M.del Carmen; Huang, Xingxing; Egusquiza Estévez, Eduard; Farhat, Mohamed; Avellan, François Abstract: When in operation, pump-turbine runners have to withstand large pressure pulsations generated by the rotor-stator interaction. The analysis of the dynamic behavior of these structures is necessary to avoid damage. For this analysis a realistic model of the runner is necessary. When the runner is submerged in water and inside the casing, its dynamic response is greatly affected. The added mass effects of the surrounding fluid and the proximity of the head-cover and bottom-cover may reduce the natural frequencies. The frequency reduction produced by the added mass effects and the influence of the boundary conditions has to be known for a safe design of the runner. In this paper an experimental investigation on the dynamic response of a model runner is presented. A reduced scale model of a pump-turbine was tested outside and inside the casing with different boundary conditions. For the excitation of the runner at different frequencies piezoelectric patches were used. The response was measured with miniature accelerometers located in several positions inside the runner. From the measurements the natural frequencies and mode-shapes of the runner were calculated using EMA. The influence of the added mass and of the boundary conditions is presented and discussed. Wed, 17 Apr 2013 12:02:49 GMT http://hdl.handle.net/2117/18852 2013-04-17T12:02:49Z Presas Batlló, Alexandre; Valero Ferrando, M.del Carmen; Huang, Xingxing; Egusquiza Estévez, Eduard; Farhat, Mohamed; Avellan, François no When in operation, pump-turbine runners have to withstand large pressure pulsations generated by the rotor-stator interaction. The analysis of the dynamic behavior of these structures is necessary to avoid damage. For this analysis a realistic model of the runner is necessary. When the runner is submerged in water and inside the casing, its dynamic response is greatly affected. The added mass effects of the surrounding fluid and the proximity of the head-cover and bottom-cover may reduce the natural frequencies. The frequency reduction produced by the added mass effects and the influence of the boundary conditions has to be known for a safe design of the runner. In this paper an experimental investigation on the dynamic response of a model runner is presented. A reduced scale model of a pump-turbine was tested outside and inside the casing with different boundary conditions. For the excitation of the runner at different frequencies piezoelectric patches were used. The response was measured with miniature accelerometers located in several positions inside the runner. From the measurements the natural frequencies and mode-shapes of the runner were calculated using EMA. The influence of the added mass and of the boundary conditions is presented and discussed. http://hdl.handle.net/2117/18358 Title: A numerical simulation of fluid-structure interaction for flow through valves of a hermetic compressor with immersed boundary method Authors: Mushyam, Aditya; Bergadà Granyó, Josep Maria Fri, 15 Mar 2013 16:53:47 GMT http://hdl.handle.net/2117/18358 2013-03-15T16:53:47Z Mushyam, Aditya; Bergadà Granyó, Josep Maria no http://hdl.handle.net/2117/17894 Title: Analysis if the dynamic response of pump-turbine runners- Part I: Experiment Authors: Presas Batlló, Alexandre; Valero Ferrando, M.del Carmen; Egusquiza Estévez, Eduard; Huang, Xingxing; Farhat, Mohamed; Avellan, François Abstract: When in operation, pump-turbine runners have to withstand large pressure pulsations generated by the rotor-stator interaction. The analysis of the dynamic behavior of these structures is necessary to avoid damage. For this analysis a realistic model of the runner is necessary. When the runner is submerged in water and inside the casing, its dynamic response is greatly affected. The added mass effects of the surrounding fluid and the proximity of the head-cover and bottom-cover may reduce the natural frequencies. The frequency reduction produced by the added mass effects and the influence of the boundary conditions has to be known for a safe design of the runner. In this paper an experimental investigation on the dynamic response of a model runner is presented. A reduced scale model of a pump-turbine was tested outside and inside the casing with different boundary conditions. For the excitation of the runner at different frequencies piezoelectric patches were used. The response was measured with miniature accelerometers located in several positions inside the runner. From the measurements the natural frequencies and mode-shapes of the runner were calculated using EMA. The influence of the added mass and of the boundary conditions is presented and discussed. Wed, 20 Feb 2013 11:36:21 GMT http://hdl.handle.net/2117/17894 2013-02-20T11:36:21Z Presas Batlló, Alexandre; Valero Ferrando, M.del Carmen; Egusquiza Estévez, Eduard; Huang, Xingxing; Farhat, Mohamed; Avellan, François no When in operation, pump-turbine runners have to withstand large pressure pulsations generated by the rotor-stator interaction. The analysis of the dynamic behavior of these structures is necessary to avoid damage. For this analysis a realistic model of the runner is necessary. When the runner is submerged in water and inside the casing, its dynamic response is greatly affected. The added mass effects of the surrounding fluid and the proximity of the head-cover and bottom-cover may reduce the natural frequencies. The frequency reduction produced by the added mass effects and the influence of the boundary conditions has to be known for a safe design of the runner. In this paper an experimental investigation on the dynamic response of a model runner is presented. A reduced scale model of a pump-turbine was tested outside and inside the casing with different boundary conditions. For the excitation of the runner at different frequencies piezoelectric patches were used. The response was measured with miniature accelerometers located in several positions inside the runner. From the measurements the natural frequencies and mode-shapes of the runner were calculated using EMA. The influence of the added mass and of the boundary conditions is presented and discussed. http://hdl.handle.net/2117/17748 Title: The effect of cavitation on the natural frequencies of a hydrofoil Authors: Torre Rodríguez, Óscar de la; Escaler Puigoriol, Francesc Xavier; Egusquiza Estévez, Eduard; Dreyer, Matthieu; Farhat, Mohamed Thu, 14 Feb 2013 09:23:34 GMT http://hdl.handle.net/2117/17748 2013-02-14T09:23:34Z Torre Rodríguez, Óscar de la; Escaler Puigoriol, Francesc Xavier; Egusquiza Estévez, Eduard; Dreyer, Matthieu; Farhat, Mohamed no http://hdl.handle.net/2117/17739 Title: Cavitation intensity measured on a Naca 0015 hydrofoil with various gas contents Authors: Ekanger, Jarle V.; Kjeldsen, Morten; Escaler Puigoriol, Francesc Xavier; Kawakami, Ellison; Arndt, Roger E. A. Wed, 13 Feb 2013 17:52:20 GMT http://hdl.handle.net/2117/17739 2013-02-13T17:52:20Z Ekanger, Jarle V.; Kjeldsen, Morten; Escaler Puigoriol, Francesc Xavier; Kawakami, Ellison; Arndt, Roger E. A. no http://hdl.handle.net/2117/17724 Title: Desarrollo de conocimiento para la mejora del mantenimiento predictivo en el sector eólico Authors: Escaler Puigoriol, Francesc Xavier Wed, 13 Feb 2013 14:35:16 GMT http://hdl.handle.net/2117/17724 2013-02-13T14:35:16Z Escaler Puigoriol, Francesc Xavier no http://hdl.handle.net/2117/16871 Title: Contributions from the apGDM-WDGpa (World Democratic Governance project association) Authors: Xercavins, Josep Thu, 08 Nov 2012 12:59:14 GMT http://hdl.handle.net/2117/16871 2012-11-08T12:59:14Z Xercavins, Josep no http://hdl.handle.net/2117/16870 Title: GSP Civil Society Consultation Questions - Inputs by Josep Xercavins Authors: Xercavins, Josep Thu, 08 Nov 2012 12:43:38 GMT http://hdl.handle.net/2117/16870 2012-11-08T12:43:38Z Xercavins, Josep no http://hdl.handle.net/2117/16455 Title: International design project semester Authors: Segalàs Coral, Jorge; Benson Murphy, Patricia Abstract: Sustainability and Internationalization are key factors within educational programmes and institutions nowadays. Offering programmes which focus on these factors at undergraduate level has been a priority at the School of Engineering of Vilanova i la Geltrú (EPSEVG) since the introduction of the European Project Semester (EPS) in 2008. In line with its policy to increase Internationalization and Sustainability in its programmes, the School of Engineering of Vilanova i la Geltrú (EPSEVG) has designed and coordinated a new Erasmus mobility programme, the International Design Project Semester (IDPS), which started in February 2012. IDPS trains engineering students by applying Project Based Learning in intercultural groups. The working language is English and the programme is designed for degree students in their 7th or 8th semester. The IDPS programme offered at the EPSEVG emphasises the introduction of competences in sustainability and human technology. The main objective of the IDPS is to improve the learning outcomes and competences of industrial design engineering students especially in areas of sustainability. It is divided into two parts. One part covers four three (ECTS) credit core courses in specialist fields of study such as Eco Design , Human Centred Design , Sustainable Value Design and Visual Language and Grammar and the second part involves working on a project (worth 18 ECTS. Additional seminars and workshops compliment the courses and vary from programme to programme. The projects are proposed by local companies and research groups. This paper shows the design methodology used in the IDPS programme its structure and the sustainability competences to be achieved by the students. Fri, 07 Sep 2012 11:03:50 GMT http://hdl.handle.net/2117/16455 2012-09-07T11:03:50Z Segalàs Coral, Jorge; Benson Murphy, Patricia no Design, sustainability, internationalization, project based learning, blended learning Sustainability and Internationalization are key factors within educational programmes and institutions nowadays. Offering programmes which focus on these factors at undergraduate level has been a priority at the School of Engineering of Vilanova i la Geltrú (EPSEVG) since the introduction of the European Project Semester (EPS) in 2008. In line with its policy to increase Internationalization and Sustainability in its programmes, the School of Engineering of Vilanova i la Geltrú (EPSEVG) has designed and coordinated a new Erasmus mobility programme, the International Design Project Semester (IDPS), which started in February 2012. IDPS trains engineering students by applying Project Based Learning in intercultural groups. The working language is English and the programme is designed for degree students in their 7th or 8th semester. The IDPS programme offered at the EPSEVG emphasises the introduction of competences in sustainability and human technology. The main objective of the IDPS is to improve the learning outcomes and competences of industrial design engineering students especially in areas of sustainability. It is divided into two parts. One part covers four three (ECTS) credit core courses in specialist fields of study such as Eco Design , Human Centred Design , Sustainable Value Design and Visual Language and Grammar and the second part involves working on a project (worth 18 ECTS. Additional seminars and workshops compliment the courses and vary from programme to programme. The projects are proposed by local companies and research groups. This paper shows the design methodology used in the IDPS programme its structure and the sustainability competences to be achieved by the students. http://hdl.handle.net/2117/16190 Title: Sustainable technology innovation course. Constructive and community-oriented learning postgraduate education Authors: Segalàs Coral, Jorge; Tejedor Papell, Gemma Abstract: The International Seminar on Sustainable Technology Innovation is a course offered within the framework of the Master of Sustainability of Barcelona Tech University. The main goals of the course are: to connect experts, future researchers and policy-makers on real topics where long-term technological system renewal is needed in order to fulfill sustainability requirements; to increase the understanding of sustainable development in the long term and the role of technology therein embedded in systems; to increase the capability to apply foresighting, forecasting and backcasting; to contribute to the development of the scientific work competences of students; to increase the ability of teachers to teach the approach of future imaging, foresighting, forecasting and backcasting; to become an experts’ meeting point; and to create networking activities among different groups and institutions. The Course introduces methodology of Backcasting scenarios in real sustainability problems. The learning environment is international, transdisciplinar, intergenarational and intercultural. It includes stakeholders’ dialogues and discussions. The course is organized around current sustainability-relevant topics, which are analyzed in case studies based in different contexts: going from developed to developing countries and from local to global cases. Students apply scenario methodologies to the case studies in order to set up the most contextualized sustainable strategies. In 2012, UPC Barcelona Tech is running the course for the fifth time. This year it is organized within the Erasmus Intensive Program framework financed by EU. Students and lecturers from 6 European universities and with different backgrounds are participating in the course. The course is divided into 4 phases: 1- Local situation analysis. From March to May students analyze the topic in their own countries/regions. 2- Case study analysis. In May, students are grouped into international, multidisciplinary teams and define the current state of the case studies, as well as the questions and challenges that they pose. 3- Seminar at UPC. In June, students, lecturers and stakeholders meet in Barcelona, where the course is run for two weeks in a presential framework. 4- Evaluation of the course. Students analyze their learning experience in terms of competences acquisition. So far more than 130 students, 30 lecturers and 50 stakeholders have participated in the course. The topics analyzed in the course vary each year and are related to relevant sustainability challenges: urban solid waste management; food & drinks packaging waste; overfishing and marine ecosystem degradation; sustainable mobility and agro-ecology. This paper explains more about the learning environment, as well as the challenges and lessons learnt when organizing such a course, and the gains made by students. Fri, 06 Jul 2012 11:46:23 GMT http://hdl.handle.net/2117/16190 2012-07-06T11:46:23Z Segalàs Coral, Jorge; Tejedor Papell, Gemma no Learning, Backcasting, international, intercultural, transdisciplinary, sustainability The International Seminar on Sustainable Technology Innovation is a course offered within the framework of the Master of Sustainability of Barcelona Tech University. The main goals of the course are: to connect experts, future researchers and policy-makers on real topics where long-term technological system renewal is needed in order to fulfill sustainability requirements; to increase the understanding of sustainable development in the long term and the role of technology therein embedded in systems; to increase the capability to apply foresighting, forecasting and backcasting; to contribute to the development of the scientific work competences of students; to increase the ability of teachers to teach the approach of future imaging, foresighting, forecasting and backcasting; to become an experts’ meeting point; and to create networking activities among different groups and institutions. The Course introduces methodology of Backcasting scenarios in real sustainability problems. The learning environment is international, transdisciplinar, intergenarational and intercultural. It includes stakeholders’ dialogues and discussions. The course is organized around current sustainability-relevant topics, which are analyzed in case studies based in different contexts: going from developed to developing countries and from local to global cases. Students apply scenario methodologies to the case studies in order to set up the most contextualized sustainable strategies. In 2012, UPC Barcelona Tech is running the course for the fifth time. This year it is organized within the Erasmus Intensive Program framework financed by EU. Students and lecturers from 6 European universities and with different backgrounds are participating in the course. The course is divided into 4 phases: 1- Local situation analysis. From March to May students analyze the topic in their own countries/regions. 2- Case study analysis. In May, students are grouped into international, multidisciplinary teams and define the current state of the case studies, as well as the questions and challenges that they pose. 3- Seminar at UPC. In June, students, lecturers and stakeholders meet in Barcelona, where the course is run for two weeks in a presential framework. 4- Evaluation of the course. Students analyze their learning experience in terms of competences acquisition. So far more than 130 students, 30 lecturers and 50 stakeholders have participated in the course. The topics analyzed in the course vary each year and are related to relevant sustainability challenges: urban solid waste management; food & drinks packaging waste; overfishing and marine ecosystem degradation; sustainable mobility and agro-ecology. This paper explains more about the learning environment, as well as the challenges and lessons learnt when organizing such a course, and the gains made by students. http://hdl.handle.net/2117/16189 Title: International design project semester: a program to challenge industrial design engineering undergraduates to work and study in teams in both presential and non presential learning environments Authors: Segalàs Coral, Jorge; Benson Murphy, Patricia Abstract: Since 1991, the Technical University of Catalonia has focussed on introducing Sustainability education in all its engineering and architectural programmes through two environmental plans (1996-2000, 2000-2005), and currently through the UPC Sustainable 2015 [1] plan. Under this framework and following the success of the project programme, European Project Semester (EPS) the School of Engineering of Vilanova i la Geltrú (EPSEVG) has designed and coordinated a new Erasmus mobility programme, the International Design Project Semester (IDPS), which started in February 2012. IDPS trains engineering students by applying Project Based Learning in intercultural groups. The working language is English and the programme is designed for degree students in their 7th or 8th semester. The IDPS programme offered at the EPSEVG emphasises the introduction of competences in sustainability and human technology. The main objective of the IDPS is to improve the learning outcomes and competences of industrial design engineering students especially in areas of sustainability. It also endeavours to improve their ability to work in intercultural settings developing real projects with 4-6 other students. The IDPS is divided into two main parts. One part covers the four core courses (each worth 3 ECTS) and the second part involves carrying out a project (worth 18 ECTS). The courses are in Eco- Design, Sustainable Value Design, Human Centred Design and a Business Practicum. Additional seminars and workshops will compliment the courses and will vary from programme to programme. The projects are proposed by local companies and research groups. The inaugural IDPS programme will start in February 2012 and participants will include 5 students from partner universities and also members of teaching staff from the school of Engineering in Vilanova i la Geltrú. This paper shows the design methodology used in the IDPS programme, its structure and the sustainability competences the students are expected to achieve. Fri, 06 Jul 2012 11:17:30 GMT http://hdl.handle.net/2117/16189 2012-07-06T11:17:30Z Segalàs Coral, Jorge; Benson Murphy, Patricia no Design, Sustainability, Internationalization, Project Based learning, Blended learning Since 1991, the Technical University of Catalonia has focussed on introducing Sustainability education in all its engineering and architectural programmes through two environmental plans (1996-2000, 2000-2005), and currently through the UPC Sustainable 2015 [1] plan. Under this framework and following the success of the project programme, European Project Semester (EPS) the School of Engineering of Vilanova i la Geltrú (EPSEVG) has designed and coordinated a new Erasmus mobility programme, the International Design Project Semester (IDPS), which started in February 2012. IDPS trains engineering students by applying Project Based Learning in intercultural groups. The working language is English and the programme is designed for degree students in their 7th or 8th semester. The IDPS programme offered at the EPSEVG emphasises the introduction of competences in sustainability and human technology. The main objective of the IDPS is to improve the learning outcomes and competences of industrial design engineering students especially in areas of sustainability. It also endeavours to improve their ability to work in intercultural settings developing real projects with 4-6 other students. The IDPS is divided into two main parts. One part covers the four core courses (each worth 3 ECTS) and the second part involves carrying out a project (worth 18 ECTS). The courses are in Eco- Design, Sustainable Value Design, Human Centred Design and a Business Practicum. Additional seminars and workshops will compliment the courses and will vary from programme to programme. The projects are proposed by local companies and research groups. The inaugural IDPS programme will start in February 2012 and participants will include 5 students from partner universities and also members of teaching staff from the school of Engineering in Vilanova i la Geltrú. This paper shows the design methodology used in the IDPS programme, its structure and the sustainability competences the students are expected to achieve. http://hdl.handle.net/2117/16188 Title: Engineering education and sustainability. Sustainable Technology Excellence Program (STEP-Vilanova) Authors: Segalàs Coral, Jorge; Hernández Gómez, M. Angeles Abstract: Embedding Sustainability in technological curricula has become a crucial factor for educating engineers with competences in sustainability. The Sustainable Technology Excellence Program STEP2015 has been designed in order to assure a successful Sustainability Embedding into all the degrees offered at Universitat Politècnica de Catalunya – Barcelona Tech. This Program takes advantage of the opportunity that the redesign of all Bachelor and Master Degrees in Spain by 2010 under the European Higher Education Area (EHEA) framework offered. The STEP program goals are: • To design compulsory courses in sustainability in each degree; • To develop the conceptual base and identify reference models in sustainability for all specialities; • Create an internal interdisciplinary network of faculty from all the schools; • To initiate new transdisciplinary research activities in technology-sustainability-education; • To spread the know-how attained, • To achieve international scientific excellence in technology-sustainability-education • To graduate the first engineers/architects of the new EHEA bachelors with sustainability as a generic competence. The program has been structured in 4 phases: Phase 1. To analyse Sustainability Competences and strategies within Barcelona Tech, and benchmark with other technological universities in order to develop a feasible and effective program. Phase 2. To carry out a pilot implementation of the STEP program in 5 schools. Phase 3. To spread the implementation to 10 Schools of UPC taking advantage of the lessons learnt in the pilot experiences. The goal here is to spread out all the know-how attained in the process to all schools in order to ensure that all UPC graduates acquire the competence in sustainability and social commitment. Phase 4. To apply the program to all UPC schools and departments. In this context, the goal of this document is to present the different actions carried out in the Engineering School of Vilanova i la Geltrú, the lessons learnt and the outcomes of the application of the program. Fri, 06 Jul 2012 09:58:28 GMT http://hdl.handle.net/2117/16188 2012-07-06T09:58:28Z Segalàs Coral, Jorge; Hernández Gómez, M. Angeles no Embedding Sustainability in technological curricula has become a crucial factor for educating engineers with competences in sustainability. The Sustainable Technology Excellence Program STEP2015 has been designed in order to assure a successful Sustainability Embedding into all the degrees offered at Universitat Politècnica de Catalunya – Barcelona Tech. This Program takes advantage of the opportunity that the redesign of all Bachelor and Master Degrees in Spain by 2010 under the European Higher Education Area (EHEA) framework offered. The STEP program goals are: • To design compulsory courses in sustainability in each degree; • To develop the conceptual base and identify reference models in sustainability for all specialities; • Create an internal interdisciplinary network of faculty from all the schools; • To initiate new transdisciplinary research activities in technology-sustainability-education; • To spread the know-how attained, • To achieve international scientific excellence in technology-sustainability-education • To graduate the first engineers/architects of the new EHEA bachelors with sustainability as a generic competence. The program has been structured in 4 phases: Phase 1. To analyse Sustainability Competences and strategies within Barcelona Tech, and benchmark with other technological universities in order to develop a feasible and effective program. Phase 2. To carry out a pilot implementation of the STEP program in 5 schools. Phase 3. To spread the implementation to 10 Schools of UPC taking advantage of the lessons learnt in the pilot experiences. The goal here is to spread out all the know-how attained in the process to all schools in order to ensure that all UPC graduates acquire the competence in sustainability and social commitment. Phase 4. To apply the program to all UPC schools and departments. In this context, the goal of this document is to present the different actions carried out in the Engineering School of Vilanova i la Geltrú, the lessons learnt and the outcomes of the application of the program. http://hdl.handle.net/2117/15914 Title: Piezoelectric energy harvesting from induced vortex in water flow Authors: Molino Minero, Erik; Carbonell Ventura, Montserrat; Fisac Fuentes, Carles; Manuel Lázaro, Antonio; Mihai Toma, Daniel Abstract: On this paper an evaluation of an energy harvesting system is presented. The system scavenges energy from a water flow using induced vortexes and piezoelectric materials. Cylinders of different size generate the vortexes and are attached to a cantilever that holds the piezoelectric generators. The evaluations consist on testing the performance of the cylinders and observe the frequencies and voltages generated. The preliminary results show that some of the configurations can generate a power of up to 0.31 μW. Wed, 23 May 2012 12:10:22 GMT http://hdl.handle.net/2117/15914 2012-05-23T12:10:22Z Molino Minero, Erik; Carbonell Ventura, Montserrat; Fisac Fuentes, Carles; Manuel Lázaro, Antonio; Mihai Toma, Daniel no On this paper an evaluation of an energy harvesting system is presented. The system scavenges energy from a water flow using induced vortexes and piezoelectric materials. Cylinders of different size generate the vortexes and are attached to a cantilever that holds the piezoelectric generators. The evaluations consist on testing the performance of the cylinders and observe the frequencies and voltages generated. The preliminary results show that some of the configurations can generate a power of up to 0.31 μW. http://hdl.handle.net/2117/15553 Title: Caracterización del tipo de cavitación mediante dinámica computacional de fluidos para posteriores aplicaciones al estudio experimental del daño por cavitación Authors: Moll, Flavio; Manuele, Diego; Coussirat Núñez, Miguel Gustavo; Guardo Zabaleta, Alfredo de Jesús; Fontanals García, Alfred Abstract: La cavitación se corresponde a una estructura bifásica (líquido-vapor) cuando la presión del líquido disminuye hasta su presión de vapor, pv. Esta disminución de pv puede deberse a diversos factores relacionados con la hidrodinámica del flujo y las propiedades físicas del fluido, pudiendo presentar diferentes características. En la cavitación hidrodinámica, pueden distinguirse efectos que pueden producir un acoplamiento fluido-estructura (lock-in) que puede favorecen la falla del material, sólido que confina al fluido, lo que conduce a la pérdida de rendimiento y daño mecánico en turbomáquinas. Los ensayos experimentales muestran que el estado de cavitación desarrollada puede tener diferentes estructuras, (e.g. de burbujas, de lámina, supercavitación, etc.), siendo algunas de ellas de tipo periódica. Estas estructuras dependen del estado fluidodinámico del flujo, siendo algunas de ellas más agresivas desde el punto de vista del daño por cavitación. Debido al costo de los experimentos, es de interés evaluar si mediante dinámica computacional de fluidos (CFD) se puede caracterizar el tipo de estructura que posee la zona de vaporización/colapso de las burbujas en diferentes dispositivos hidrodinámicos. Este tipo de flujo muestra una gran complejidad ya que deben tenerse en cuenta el estado bifásico y turbulento del flujo. El objetivo de este trabajo es demostrar si es posible caracterizar mediante CFD el tipo de estructura que se presenta cuando hay cavitación desarrollada, utilizando datos experimentales para una configuración de flujo sobre un escalón, probándose primero las aproximaciones que se obtienen mediante CFD. Se estudia la validación y la sensibilidad a parámetros de modelado con el objetivo de aplicar el conocimiento adquirido a la optimización del diseño de probetas que se insertarán en un banco de ensayos hidrodinámico para la comprobación de la resistencia al daño por cavitación de distintos materiales. Se identifican parámetros que permitan reproducir las condiciones de cavitación más agresiva con el objeto de reducir los tiempos de ensayo. Tue, 13 Mar 2012 10:39:32 GMT http://hdl.handle.net/2117/15553 2012-03-13T10:39:32Z Moll, Flavio; Manuele, Diego; Coussirat Núñez, Miguel Gustavo; Guardo Zabaleta, Alfredo de Jesús; Fontanals García, Alfred no La cavitación se corresponde a una estructura bifásica (líquido-vapor) cuando la presión del líquido disminuye hasta su presión de vapor, pv. Esta disminución de pv puede deberse a diversos factores relacionados con la hidrodinámica del flujo y las propiedades físicas del fluido, pudiendo presentar diferentes características. En la cavitación hidrodinámica, pueden distinguirse efectos que pueden producir un acoplamiento fluido-estructura (lock-in) que puede favorecen la falla del material, sólido que confina al fluido, lo que conduce a la pérdida de rendimiento y daño mecánico en turbomáquinas. Los ensayos experimentales muestran que el estado de cavitación desarrollada puede tener diferentes estructuras, (e.g. de burbujas, de lámina, supercavitación, etc.), siendo algunas de ellas de tipo periódica. Estas estructuras dependen del estado fluidodinámico del flujo, siendo algunas de ellas más agresivas desde el punto de vista del daño por cavitación. Debido al costo de los experimentos, es de interés evaluar si mediante dinámica computacional de fluidos (CFD) se puede caracterizar el tipo de estructura que posee la zona de vaporización/colapso de las burbujas en diferentes dispositivos hidrodinámicos. Este tipo de flujo muestra una gran complejidad ya que deben tenerse en cuenta el estado bifásico y turbulento del flujo. El objetivo de este trabajo es demostrar si es posible caracterizar mediante CFD el tipo de estructura que se presenta cuando hay cavitación desarrollada, utilizando datos experimentales para una configuración de flujo sobre un escalón, probándose primero las aproximaciones que se obtienen mediante CFD. Se estudia la validación y la sensibilidad a parámetros de modelado con el objetivo de aplicar el conocimiento adquirido a la optimización del diseño de probetas que se insertarán en un banco de ensayos hidrodinámico para la comprobación de la resistencia al daño por cavitación de distintos materiales. Se identifican parámetros que permitan reproducir las condiciones de cavitación más agresiva con el objeto de reducir los tiempos de ensayo. http://hdl.handle.net/2117/14245 Title: Diffusion and scaling in the ocean surface Authors: Díez Rilova, Margarita; Bezerra Menezes, María Ozilea; Vila, Teresa; Castilla López, Roberto; Redondo Apraiz, José Manuel Wed, 14 Dec 2011 12:37:44 GMT http://hdl.handle.net/2117/14245 2011-12-14T12:37:44Z Díez Rilova, Margarita; Bezerra Menezes, María Ozilea; Vila, Teresa; Castilla López, Roberto; Redondo Apraiz, José Manuel no