DEVELOPMENT OF A COMPUTATIONAL MODEL FOR A SIMULTANEOUS SIMULATION OF INTERNAL FLOW AND SPRAY BREAK-UP OF THE DIESEL INJECTION PROCESS

El proceso de atomización desde una vena o lámina líquida hasta multitud de gotas dispersas en un medio gaseoso ha sido un fenómeno de interés desde hace varias décadas, especialmente en el campo de los motores de combustión interna alternativos. Multitud de estudios experimentales han sido publicados al respecto, pues una buena mezcla de aire-combustible asegura una evaporación y combustión mucho más eficientes, aumentando la potencia del motor y reduciendo la cantidad de contaminantes emitidos. Con el auge de las técnicas computacionales, muchos modelos han sido desarrollados para estudiar este proceso de atomización y mezcla. Uno de los últimos modelos que han aparecido es el llamado ELSA (Eulerian-Lagrangian Spray Atomization), que utiliza un modelo Euleriano para la parte densa del chorro y cambia a un modelo Lagrangiano cuando la concentración de líquido es suficientemente pequeña, aprovechando de esta manera las ventajas de ambos. En el presente trabajo se ha desarrollado un modelo puramente Euleriano para estudiar la influencia de la geometría interna de la tobera de inyección en el proceso de atomización y mezcla. Se ha estudiado únicamente el proceso de inyección diésel. Este modelo permite resolver en un único dominio el flujo interno y el externo, evitando así las comunes simplificaciones y limitaciones de la interpolación entre ambos dominios resueltos por separado. Los resultados actuales son prometedores, el modelo predice con un error aceptable la penetración del chorro, el flujo másico y de cantidad de movimiento, los perfiles de velocidad y concentración, así como otros parámetros característicos del chorro.Martí Gómez-Aldaraví, P. (2014). DEVELOPMENT OF A COMPUTATIONAL MODEL FOR A SIMULTANEOUS SIMULATION OF INTERNAL FLOW AND SPRAY BREAK-UP OF THE DIESEL INJECTION PROCESS [Tesis doctoral]. Universitat Politècnica de València. https://doi.org/10.4995/Thesis/10251/43719TESISPremios Extraordinarios de tesis doctorale

On the use of gamification tools for blended learning approaches in Thermodynamics courses

[EN] During the last year 2020, education in European universities has suffered a challenging transformation from an established pedagogical model to a digital one. The face-to-face formal lectures have been replaced to on-line sessions and blended learning approaches. The courses related to the Thermodynamics subject of two Bachelor of Science Degrees (Mechanical Engineering and Automatic and Industrial Electronic Engineering) have been also adapted to the blended learning approach, in this case combining the use of screencast videos, interactive slides with comments, synchronous on-line lectures and tutorials, and virtual laboratories. This recent methodology has been demonstrated to be effective due to its flexibility and ubiquitous characteristics. However, one of the difficulties is tracking the engagement and the evolution of the students due to the reduced direct interaction between them and the instructors. Among the technological tools that are used to benefit the learning process of students, gamification tools have been demonstrated to be effective and positive for academic performance. The aim of this study is to implement and evaluate the effectiveness of the gamification in the Thermodynamics courses where the proposed blended learning approach is used. One of the goals is to identify the specific competences acquired by the students after watching the audio-visual content (videos and slides). For this purpose, a Kahoot was played before starting the on-line lecture (synchronous), and according to the score, the instructor could recognize the level of understanding of the concepts. Based on the results, the instructor was able to focus more on the weaker learning objectives, capturing their attention during the session. At the end of the session the Kahoot was played again to recognize if the concepts were consolidated during the lesson. The results show that the use of this gamification tool achieved high levels of engagement and improved the attention and participation of the students.This work has been done in the framework of the innovative teaching group EICE CONMAGIA promoted by the Instituto de Ciencias de la Educación.Bracho León, GC.; Martí-Aldaraví, P.; García Tíscar, J.; Gómez Soriano, J. (2022). On the use of gamification tools for blended learning approaches in Thermodynamics courses. En Proceedings INNODOCT/21. International Conference on Innovation, Documentation and Education. Editorial Universitat Politècnica de València. 75-82. https://doi.org/10.4995/INN2021.2021.13370758

Improving the effective communication soft skill in higher education engineering studies: an experience through written reports

[EN] With the new paradigm of higher education, courses syllabus are not only addressed to develop the knowledge in some specific contents, but also to let the student acquire a set of the so-called transversal competences or soft skills. Amongst these, the ability of the students to communicate in an effective manner is a soft skill that will present a key role in the future careers of the students. In this paper, the experience in two courses of the Aerospace Engineering Bachelor Degree working on the effective communication through written technical reports is presented. Different enhancements have been introduced over the years, including specific sessions to present best practices for written reports, assessment using rubrics or intermediate deliveries to provide feedback to the students before they deliver the final report. The analyzed courses belong to consecutive years and are taught in both Spanish and English, which provides a wide view for understanding the impact of each feature. With the current configuration, significant improvement in the students written reports readability is obtained. Their works are more rigorous in terms of writing and format. Nevertheless, the effect of these new features on the technical content of the reports is slight. Overall, the content is transmitted by the students in a more effective manner.Carreres Talens, M.; García-Cuevas González, LM.; Martí Gómez-Aldaraví, P.; Navarro García, R. (2020). Improving the effective communication soft skill in higher education engineering studies: an experience through written reports. Editorial Universitat Politècnica de València. 219-227. https://doi.org/10.4995/INN2019.2019.10128OCS21922

Desarrollo de un modelo computacional para el estudio simultáneo de flujo interno y atomización y mezcla del chorro diésel

[ES] Se ha desarrollado un nuevo modelo computacional en OpenFOAM capaz de calcular el flujo interno (no cavitante) y el flujo externo (en condiciones correspondientes a elevados números de Reynolds y Weber) del proceso de inyección en una misma simulación, sin necesidad de interpolación o condiciones de contorno complicadas. Se ha llevado a cabo de forma satisfactoria el proceso de verificación del mismo en casos monofásicos, tanto para líquidos como para gases, comparando con problemas que tienen solución analítica. A falta de completar la validación, los resultados preliminares en simulaciones de chorros son prometedores. Este nuevo modelo Euleriano - Euleriano tiene ciertas ventajas frente a sus competidores, ya sea en software de código abierto o comercial, pues utiliza un enfoque clásico para resolver la presión. Como resultado del trabajo realizado para su desarrollo, directo o indirecto, se han conseguido tres publicaciones en revistas internacionales[EN] new computational model has been developed in OpenFOAM. This model is able to calculate the internal flow (non-cavitating) and the external flow (under conditions corresponding to high Reynolds and Weber numbers) of the injection process in one single simulation, without need of interpolating or using complex boundary conditions. Verification process in mono-phase cases was successfully carried out, for either liquid or gas, through comparisons with problems which have analytical solution. Although validation is not completed yet, preliminary results on spray simulations are promising. This new Eulerian-Eulerian model has advantages over its competitors, either in open source or commercial software, because it uses a classical approach for solving the pressure. As result of the work, direct or indirect, done for its development, three articles have been published in international journals.Martí Gómez-Aldaraví, P. (2012). Desarrollo de un modelo computacional para el estudio simultáneo de flujo interno y atomización y mezcla del chorro diésel. http://hdl.handle.net/10251/27570Archivo delegad