Loading…
Oblique collision and reconnection of a vortex ring with a vortex tube
The oblique collision and reconnection of a vortex ring and a vortex tube are numerically investigated using a sixth-order accurate vortex-in-cell method. At the oblique collision angle (α) of 0°, the reconnection occurs, in which half of the ring joins with a part of the tube to create a reconnecte...
Saved in:
Published in: | Physics of fluids (1994) 2021-12, Vol.33 (12) |
---|---|
Main Authors: | , , |
Format: | Article |
Language: | English |
Subjects: | |
Citations: | Items that this one cites Items that cite this one |
Online Access: | Get full text |
Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
Summary: | The oblique collision and reconnection of a vortex ring and a vortex tube are numerically investigated using a sixth-order accurate vortex-in-cell method. At the oblique collision angle (α) of 0°, the reconnection occurs, in which half of the ring joins with a part of the tube to create a reconnected ring, and another half of the ring links to the rest of the tube to establish a new reconnected tube. At α = 15°, 30°, and 45°, two reconnections take place, where the first one generates a distorted reconnected tube, and then this tube reconnects itself to construct a new ring and a tube. The secondary vortex structures only appear surrounding the reconnected ring at α = 0°, while they are around both the reconnected ring and tube at α = 30° and 45°. As α increases, the time interval τ between two reconnections rises, and it is determined by a quadratic function as
τ
(
α
)
=
0.0037
α
2
+
0.0853
α
+
0.975. The energy spectrum of the flow at the wavenumber (k) from 3 to 10 obeys the
k
−
5
/
3 slope of a fully turbulent flow, and it is independent of α. However, the energy spectrum at the high wavenumber from 10 to 60 depends on α. This energy spectrum approaches the
k
−
5
/
3 slope after the second reconnection for whole investigated cases. |
---|---|
ISSN: | 1070-6631 1089-7666 |
DOI: | 10.1063/5.0073126 |