Memorias de investigación
Ponencias en congresos:
Time Evolution of the Fractal Dimension in Turbulent Plumes
Año:2011
Áreas de investigación
  • Física química y matemáticas,
  • Ingenierías
Datos
Descripción
Turbulent mixing is a very important issue in the study of geophysical phenomena because most fluxes arising in geophysics fluids are turbulent. We study turbulent mixing due to convection using a laboratory experimental model with two miscible fluids of different density with an initial top heavy density distribution. The fluids that form the initial unstable stratification are miscible and the turbulence will produce molecular mixing. The denser fluid comes into the lighter fluid layer and it generates several forced plumes which are gravitationally unstable. As the turbulent plumes develop, the denser fluid comes into contact with the lighter fluid layer and the mixing process grows. Their development is caused by the lateral interaction between these plumes at the complex fractal surface between the dense and light fluids. Fractal studies provide a natural method for analyzing turbulent fields like plumes and their turbulent cascade processes. If there is a subrange where production and dissipation are at equilibrium, it is possible a functional relation between the exponent b of the spectral density function and the fractal dimension D of the scalar field represented in the images: beta=2EU+1-2D, where EU is the euclidian dimension. The last aim is to investigate the intermittency of the mixing plumes (measuring the maximum fractal dimension and using results of another researchers relating to the sixth and third order structure function scaling exponents). We investigate the fractal structure of non homogeneous plumes affected by different levels of buoyancy (different values of the Atwood number (A) and by the initial potential energy (several initial heights Ho of the source). We analyse the time evolution of the fractal dimension as plumes develop and we make a multifractal analysis. This fractal and multifractal analysis of the turbulent convective plume was performed with the box counting algorithm for different intensities of evolving plume images using a special software.
Internacional
Si
Nombre congreso
European Geosciences Union General Assembly (EGU 2011)
Tipo de participación
960
Lugar del congreso
Viena, Austria
Revisores
Si
ISBN o ISSN
1607-7962
DOI
Fecha inicio congreso
03/04/2011
Fecha fin congreso
08/04/2011
Desde la página
13341
Hasta la página
13341
Título de las actas
8th EGU General Assembly. Geophysical Research Abstracts, 13, 8656 (2011). [http://www.geophysical-research-abstracts.net]
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Participantes
Grupos de investigación, Departamentos, Centros e Institutos de I+D+i relacionados
  • Creador: Grupo de Investigación: Grupo de Automatización en Señal y Comunicaciones (GASC)
  • Centro o Instituto I+D+i: Centro de Estudios e Investigación para la Gestión de Riesgos Agrarios Medioambientales (CEIGRAM)
  • Departamento: Matemática Aplicada a la Ingeniería Agronómica