Examinando por Materia "Dinámica de fluidos computacional"

Mostrando 1 - 2 de 2
  • Miniatura
    PublicaciónAcceso abierto
    Diseño de una hélice de alto rendimiento para mejorar la eficiencia de navegación de un vehículo acuático en el río Sinú
    (2023-07-11) León Martínez, Gustavo Andrés De ; Mass Ortega, Juan Fernando; Rhenals Julio, Jesús David; Martínez Guarín, Arnold Rafael
    Este estudio se enfocó en el diseño una hélice para mejorar la eficiencia de navegación de un vehículo acuático en el río Sinú. Mediante una rigurosa investigación de literatura y antecedentes, se seleccionó el perfil NREL's S804 por su adecuado espesor y cumplimiento de los requisitos técnicos (fuerza de sustentación y arrastre) debido a las condiciones del rio. Implementando la teoría del elemento de aspa y la conservación del momentum, se desarrolló un procedimiento de diseño óptimo para la hélice. La validación y evaluación del rendimiento en condiciones operativas diversas se llevó a cabo mediante dinámica de fluidos computacional (CFD), utilizando una precisa y eficiente malla poly-hexcore adaptada a la compleja geometría de las hélices. Por otro lado, se realizó un montaje experimental para medir y comparar la formación de la estela con los resultados obtenidos en CFD. Para asegurar la precisión del modelo de simulación, se aplicó un modelo de calibración riguroso. Los resultados destacan una eficiencia máxima del 59,52% a 16,67 rps (1000 rpm) en el punto de diseño, demostrando la capacidad de la hélice para convertir la mayor cantidad posible de energía en empuje. Asimismo, el análisis CFD reveló una eficiencia máxima del 51,52% a 11 rps (660 rpm), subrayando la importancia de evaluar el rendimiento de la hélice en diversas condiciones operativas para comprender su comportamiento en situaciones reales. Este estudio proporciona una sólida base de conocimientos para futuras mejoras en la eficiencia y navegabilidad de vehículos acuáticos en el entorno del río Sinú.
  • Miniatura
    PublicaciónAcceso abierto
    Estudio hidrodinámico del casco de una motonave fluvial para operar en el río Sinú que tenga la menor resistencia al avance, usando herramientas computacionales y validando los resultados con un modelo a escala
    (Escuela Naval de cadetes Almirante Padilla, 2023-02-23) Torres Sánchez, Jairo Eulises; Durango Álvarez, Demóstenes José
    In the present work, a study was carried out to establish how the geometry of the hull of a four meter long vessel influences the resistance to the advance in the water of the Sinu River in the city of Monteria, Colombia, using the theories of fluid mechanics associated to naval design and with the help of computational tools, particularly the programs Maxsurf and Ansys Fluent and a scale model. The system is modeled by previously establishing the ship's mission, in which the initial conditions of the design are established such as: Maximum length, number of occupants, propulsion type, among others. With this information, a database is built, where dimensions and characteristics of some commercial models are included. By means of a linear regression, the initial dimensions of the hull are obtained, taking into account the information provided by the database. Once the initial dimensions are established and with the help of Maxsurf Modeler, the first prototype of our study is designed. The next step consists of determining a hull with a geometry that has the least resistance to the advance but that also adjusts to the mission of the ship, for this we use the information that we already have from the database and we establish three dimensional relations of the hull, such as: Beam - Length, Depth - Length and Draft - Depth, where the minimum and maximum of these relations are taken and tabulated. From this process 9 dimensions are obtained, with which 9 models with their respective geometries can be obtained, using Maxsurf Modeler. To each of these geometries the curves of the resistance to the advance as a function of the speed of the boat are determined, using the software Maxsurf Resistance. With the data obtained and the relationships of dimensions, a design of experiments was carried out, using the response surface methodology, with the objective of finding the geometry with the least resistance to the advance that fulfilled the ship's mission. These results show the region where the geometry with the lowest drag is located. The result of this study establishes that the relationship that most influences the resistance to the advance Length - Beam. To determine the drag and compare this result obtained with Maxsurf Resistance, a Computational Fluid Dynamics (CFD) analysis was used with the help of Ansys Fluent 2021 R1 software. In this study a meshing is performed, choosing a poly - hexacore mesh, which contains polyhedral and hexahedral cells that have the characteristic of combining two types of meshes (ANSYS Fluent, 2021). The ANSYS Fluent (with Fluent Meshing) module was used for the configuration of the mesh, in which three poly - hexacore meshes were created and used to carry out the mesh independence and select the appropriate mesh for the calculation of the forward resistance. Finally, a scale model (1:4) of the vessel was built to determine the total resistance to the advance by means of tests in a hydraulic test channel. These tests were carried out in the test channel of the Almirante Padilla Naval Cadet School in the city of Cartagena, Colombia. The results obtained were validated with the use of computational tools (Maxsurf and Ansys Fluent).