Development and assessment of a one-dimensional cfd solver for boiling flows in bubbly regimes

• Autores: Consuelo Gómez Zarzuela Quel
• Directores de la Tesis: Rafael Miró Herrero (dir. tes.)
• Lectura: En la Universitat Politècnica de València ( España ) en 2020
• Idioma: español
• Tribunal Calificador de la Tesis: Claubia Pereira Bezerra Lima (presid.), Joaquín Navarro Esbrí (secret.), Diana Cuervo Gómez (voc.)
• Programa de doctorado: Programa de Doctorado en Ingeniería y Producción Industrial por la Universitat Politècnica de València
• Materias:
  • Ciencias tecnológicas
    • Tecnología nuclear
    • Tecnología energética
      • Transmisión de energía
• Enlaces
  • Tesis en acceso abierto en: RiuNet
• Resumen

  • The present PhD thesis aims at the development of a one-dimensional solver capable of solving single- and two-phase flow fluid systems. The novelty of this project lies in the use of an open source CFD platform, called OpenFOAM, as a development framework for the new tool.

    For the new solver development, the conservation equations based on Navier- Stokes (three-dimensional system) have been analyzed and reduced to one dimension.

    For the two-phase simulations, the Two Fluid Model method was used as base. In addition, a series of empirical models have been selected as closing equations of the system.

    The final solver includes a series of requirements that reinforce their capabilities.

    Among them, the use of a second mesh that represents the solid and takes into account the heat transmitted to the fluid by conduction through a solid, stands out. On the other hand, the possible transfer of mass between phases in twophase fluids has been taken into account. Similarly, a subcooled boiling model has been implemented which takes into account the possible generation of vapor near the wall while the bulk is kept below saturation temperature.

    Finally, this paper presents the verification and validation of the solver. The verification has been carried out mainly with the system code TRACE, whose validation has been demonstrated in numerous works and its use is very extended in the scientific community. For the validation, we have the results of two experimental cases that allow us to demonstrate the physical validity of the new application developed.

    The use of this platform allows for a much more direct coupling between one- and three-dimensional domains, obtaining a better optimization of the calculation.