INVESTIGADORES
COSTA Andrea
artículos
Título:
Kelvin Waves with Helical Beltrami Flows Structure
Autor/es:
GONZÁLEZ, R., SARASUA, G.L., COSTA, A.
Revista:
PHYSICS OF FLUIDS
Editorial:
AIP
Referencias:
Año: 2008 vol. 20 p. 2 - 12
ISSN:
1070-6631
Resumen:
In this work we show that when an inviscid axisymmetric Rankine flow experiences a soft expansion rotating Kelvin waves (RKW) can be excited. Downstream 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.