Kelvin waves with helical Beltrami flow structure

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In this work we show that when an inviscid axisymmetric Rankine flow experiences a soft expansion, rotating Kelvin waves can be excited. Downstream of the region where the expansion occurs (the transition region) the resulting flow can be expressed as the addition of a Rankine and a Beltrami flow. T...

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Autores principales: González, R., Sarasua, G., Costa, A.
Formato: Artículo publishedVersion
Publicado: 2008
Materias:
Boundary conditions
Flow structure
Rotational flow
Beltrami constant
Beltrami flow
Kelvin wave
Oscillatory flow
Rankine flow
Fluid dynamics
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_10706631_v20_n2_p_Gonzalez
https://repositoriouba.sisbi.uba.ar/gsdl/cgi-bin/library.cgi?a=d&c=artiaex&d=paper_10706631_v20_n2_p_Gonzalez_oai
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Repositorio Digital de la Universidad de Buenos Aires (UBA) de Universidad de Buenos Aires
id I28-R145-paper_10706631_v20_n2_p_Gonzalez_oai
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spelling I28-R145-paper_10706631_v20_n2_p_Gonzalez_oai2024-08-16 González, R. Sarasua, G. Costa, A. 2008 In this work we show that when an inviscid axisymmetric Rankine flow experiences a soft expansion, rotating Kelvin waves can be excited. Downstream of the region where the expansion occurs (the transition region) the resulting flow can be expressed as the addition of a Rankine and a Beltrami flow. The Beltrami constant is determined from the Rankine upstream flow, and the helix pitch of the n=1 mode results from the boundary conditions downstream. Finally, a discussion of the process leading to oscillatory flow and a conjecture about the topological background that sustains the Beltrami flow structure are offered. © 2008 American Institute of Physics. Fil:González, R. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. application/pdf http://hdl.handle.net/20.500.12110/paper_10706631_v20_n2_p_Gonzalez info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar Phys. Fluids 2008;20(2) Boundary conditions Flow structure Rotational flow Beltrami constant Beltrami flow Kelvin wave Oscillatory flow Rankine flow Fluid dynamics Boundary conditions Flow structure Fluid dynamics Rotational flow Kelvin waves with helical Beltrami flow structure info:eu-repo/semantics/article info:ar-repo/semantics/artículo info:eu-repo/semantics/publishedVersion https://repositoriouba.sisbi.uba.ar/gsdl/cgi-bin/library.cgi?a=d&c=artiaex&d=paper_10706631_v20_n2_p_Gonzalez_oai
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-145
collection Repositorio Digital de la Universidad de Buenos Aires (UBA)
topic Boundary conditions
Flow structure
Rotational flow
Beltrami constant
Beltrami flow
Kelvin wave
Oscillatory flow
Rankine flow
Fluid dynamics
Boundary conditions
Flow structure
Fluid dynamics
Rotational flow
spellingShingle Boundary conditions
Flow structure
Rotational flow
Beltrami constant
Beltrami flow
Kelvin wave
Oscillatory flow
Rankine flow
Fluid dynamics
Boundary conditions
Flow structure
Fluid dynamics
Rotational flow
González, R.
Sarasua, G.
Costa, A.
Kelvin waves with helical Beltrami flow structure
topic_facet Boundary conditions
Flow structure
Rotational flow
Beltrami constant
Beltrami flow
Kelvin wave
Oscillatory flow
Rankine flow
Fluid dynamics
Boundary conditions
Flow structure
Fluid dynamics
Rotational flow
description In this work we show that when an inviscid axisymmetric Rankine flow experiences a soft expansion, rotating Kelvin waves can be excited. Downstream of the region where the expansion occurs (the transition region) the resulting flow can be expressed as the addition of a Rankine and a Beltrami flow. The Beltrami constant is determined from the Rankine upstream flow, and the helix pitch of the n=1 mode results from the boundary conditions downstream. Finally, a discussion of the process leading to oscillatory flow and a conjecture about the topological background that sustains the Beltrami flow structure are offered. © 2008 American Institute of Physics.
format Artículo
Artículo
publishedVersion
author González, R.
Sarasua, G.
Costa, A.
author_facet González, R.
Sarasua, G.
Costa, A.
author_sort González, R.
title Kelvin waves with helical Beltrami flow structure
title_short Kelvin waves with helical Beltrami flow structure
title_full Kelvin waves with helical Beltrami flow structure
title_fullStr Kelvin waves with helical Beltrami flow structure
title_full_unstemmed Kelvin waves with helical Beltrami flow structure
title_sort kelvin waves with helical beltrami flow structure
publishDate 2008
url http://hdl.handle.net/20.500.12110/paper_10706631_v20_n2_p_Gonzalez
https://repositoriouba.sisbi.uba.ar/gsdl/cgi-bin/library.cgi?a=d&c=artiaex&d=paper_10706631_v20_n2_p_Gonzalez_oai
work_keys_str_mv AT gonzalezr kelvinwaveswithhelicalbeltramiflowstructure
AT sarasuag kelvinwaveswithhelicalbeltramiflowstructure
AT costaa kelvinwaveswithhelicalbeltramiflowstructure
_version_ 1809357110249521152

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