Título:
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Richtmyer-meshkov and rayleigh-taylor fractal mixing
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Autor/a:
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Redondo Apraiz, José Manuel; Vila Esteve, Maria Teresa; Tellez Alvarez, Jackson David; Lopez Gonzalez-Nieto, Pilar; Sánchez, Miguel Ángel
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Otros autores:
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Universitat Politècnica de Catalunya. Departament de Física; Universitat Politècnica de Catalunya. Departament d'Enginyeria Civil i Ambiental; Universitat Politècnica de Catalunya. FLUMEN - Dinàmica Fluvial i Enginyeria Hidrològica |
Abstract:
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Turbulence affects molecular mixing in a large variety of physical processes both in the
environment, in astrophysics and in industrial situations. In some events it is interesting to
enhance the transport of mass, heat, humidity and pollutants, while sometimes it is
interesting to reduce mixing. Here we analyse some turbulent descriptors which reflect the
mixing processes in the compressible induced instabilities that take place in shocks, such as
Richtmyer-Meshkov and Rayleigh-Taylor (RM and RT). We present results related to both
instabilities and discuss their spatial and temporal variability during the advance of a
mixing front, and also their relationships with other scaling arguments. Two types of
experiments were used in this study: Mixing generated by gravitational acceleration in low
Atwood number incompressible experiments using fluids; and the full compressible shocktube
experiments using interfaces between different density gases. The role of local
turbulence has mostly relied on advanced visualization measurements through multifractal
methods. Comparisons with numerical experiments of shock driven fronts occurring at
density interfaces are also relevant. The global advance of the fronts is also measured and
fractal descriptors are calculated in both Large Eddy Simulation (LES) and Kinematic
Simulation KS models |
Abstract:
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Peer Reviewed |
Materia(s):
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-Àrees temàtiques de la UPC::Física::Física de fluids -Fluid dynamics -Turbulence -Mixing -Rayleigh-Taylor -Richtmyer-Meshkov -Instabilities -Fractal Scaling -Shock Induced Turbulence -Dinàmica de fluids -Turbulència |
Derechos:
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http://creativecommons.org/licenses/by-nc-nd/3.0/es/ |
Tipo de documento:
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Artículo - Versión publicada Artículo |
Editor:
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Institute of Thermomechanics, Academy of Sciences of the Czech Republic
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