Large Eddy Simulation of Partial Cavitation Around a 2D Plane-Convex Hydrofoil

• Soto, Ricardo ^[1] ; Valencia, Esteban ^[2] ; Cando, Edgar ^[2] ; Luo, XianWu ^[3]
  1. [1] Profesor Principal EPN
  2. [2] Profesor Auxiliar EPN
  3. [3] Professor Tsinghua

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• Localización: Revista Politécnica, ISSN-e 2477-8990, Vol. 35, Nº. 3, 2015 (Ejemplar dedicado a: Revista Politécnica), págs. 28-28
• Idioma: inglés
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• Resumen

  • Resumen: Investigaciones sobre la cavitación tienen una gran importancia económica en el campo de la maquinaria hidráulica. Durante más de 40 años, métodos de mecánica computacional de fluidos han sido para entender estosfenómenos y ayudar a mejorar los diseños de maquinarias y equipos, como el caso de bombas y turbinas hidráulicas.Sin embargo, la cavitación aparece en flujos con números de Reynolds grandes, por lo cual, los modelos tradicionales deturbulencia Reynolds-averaged Navier-Stokes (RANS) kô€€€e y kô€€€w no son capaces de capturar el fenómeno de burbujasen movimiento. Por lo cual, la presente investigación usa el modelo de turbulencia Large Eddy Simulation (LES) conmétodos implícitos (ILES) y explícitos (ELES), para simular la cavitación alrededor de un perfil plano-convexo . Lasimulación CFD ha sido llevada a cabo usando el programa de código abierto OpenFOAM y lenguaje python parael procesamiento de datos. La investigación indica que ELES y ILES porporcionan resultados similares a resultadosexperimentales obtenidos en el túnel de cavitación de la École Polytechnique Fédérale de Lausanne (EPFL).Abstract: Investigations of attached partial cavitation are important because to prevent damages in hydrulic machineryand to reduce the costs. As expected computational fluid dynamics (CFD) methods have been developed for more than40 years to understand this phenomenon and to improve the machinery designs, as pumps and hydraulic turbines.However, cavitation appears at high Reynolds numbers, so that, the traditional turbulence models Reynolds-averagedNavier-Stokes (RANS) kô€€€e and kô€€€w are not able to capture the bubbles motion. Therefore, large eddy simulation withimplicit (ILES) and explicit (ELES) turbulence methods have been used to capture and study partial cavitation arounda plane-convex hydrofoil. The CFD simulation has been carried out by the free open source software OpenFOAM andpython language for data analysis. The research shows that ELES and ILES give results similar to experiments from thecavitation tunnel of the École Polytechnique Fédérale de Lausanne (EPFL).

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