Maestría en Física Aplicada

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    Modelo paramétrico de fluidos para gases de combustión de un motor a gasolina extra
    (Universidad Técnica de Ambato. Facultad de Ingeniería en Sistemas, Electrónica e Industrial. Maestría en Física Aplicada, 2022) Gavilanes Sani, Jorge Anibal; Hidalgo Díaz, Víctor Hugo
    The present investigation is focused on the simulation of Computational Fluid Dynamics (CFD) of the combustion gases in an extra gasoline engine using the Ansys software. As a first step, the selection of the input parameters was carried out in order to investigate if they have any influence on the production of combustion gases such as carbon monoxide (CO), carbon dioxide (CO), nitrogen monoxide (NO), nitrogen dioxide (NO2) and unburned hydrocarbons (HNC). Once both the input and output parameters were selected, the levels of each input parameter were established in order to create treatments based on the experimental design (DOE) and building a 3 factorial design with a total of 9 treatments without repetition to proceed. The next step was to use the geometry of the combustion chamber that the software itself provides, build the areas of interest using the Design modeler software, perform the mesh considering meshes in more detail in areas of interest such as the spray and the ignition point using Meshing Autodine software. In the third step, the Navier Stokes equations were solved using the 𝑘 - 𝜀 (RNG) Re-Normalisation Group turbulence model in conjunction with the fuel injection chemistry and the fuel injection model. The last step consists of setting the simulation environment when selecting the ignition model for modeling the turbulence of the flame, defining the boundary conditions and the start of the combustion chamber. The procedure detailed in the previous paragraph was carried out for the 9 treatments proposed by the factorial design and once each of the simulations had been completed, the results obtained during the combustion process that occurred between the angles were analyzed and interpreted. piston displacement from 720 to 740 Crank Angle (CA).
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    Evaluación de los efectos de flujo cavitativo en estrangulamiento aplicado a válvulas reductoras hidráulicas
    (Universidad Técnica de Ambato. Facultad de Ingeniería en Sistemas, Electrónica e Industrial. Maestría en Física Aplicada, 2022) Méndez Cambell, Guillermo Diego; Hidalgo Díaz, Víctor Hugo
    In this master’s thesis, the cavitating flow in a hydraulic valve was investigated, emphasizing the numerical study of the cavitating flow in the globe valve using techniques related to computational fluid dynamics CFD. OpenFoam as free and opensource CFD software was used for the simulation. The main objective is to understand the cavitating phenomenon from the formation to the collapse of the cavity. The necessary methodology was developed to study the different stages in the formation of cavities. Using CAD tools, the geometry of the globe valve was built, and through snappyHexMesh tools, the study domain was optimized. The PIMPLE algorithm was used for the numerical resolution of the governing equations, the turbulence model used is k − ωSST and cavitation models used is Schnerr-Sauer.