Details
| Original language | English |
|---|---|
| Pages (from-to) | 821-844 |
| Number of pages | 24 |
| Journal | Journal of Marine Science and Engineering |
| Volume | 3 |
| Issue number | 3 |
| Publication status | Published - 5 Aug 2015 |
Abstract
In the context of dam breaks, tsunami, and flash floods, it is paramount to quantify the time-history of forces by the rapidly transient flow to vertical structures and the characteristics of the induced flow patterns. To resemble on-land tsunami-induced flow, a free-surface-piercing structure is exposed to long leading depression waves in a tsunami flume where long waves run up and down a 1:40 smooth and impermeable sloping beach after its generation by a volume-driven wave maker. The structure and its surrounding were monitored with force transducers, pressure gauges and cameras. Preparatory steady-state experiments were accomplished to determine the drag force coefficient of the square cylinder at various water depths. The flow during wave run-up and draw-down acting on the structure resulted in distinct flow pattern which were characteristic for the type of flow-structure interaction. Besides bow wave propagating upstream, a standing or partially-standing wave was observed in front of the structure together with a wake formation downstream, while a von Kármán vortex street developed during the deceleration phase of the flow motion and during draw-down. Force measurements indicated a sudden increase in the stream-wise total force starting with the arrival of the flow front during initial run-up. Lateral velocities showed significant oscillations in correlation with the von Kármán vortex street development. A comparison of the total measured base force with the analytically-calculated share of the drag force revealed that forces were prevailingly drag-dominated.
ASJC Scopus subject areas
- Engineering(all)
- Civil and Structural Engineering
- Environmental Science(all)
- Water Science and Technology
- Engineering(all)
- Ocean Engineering
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In: Journal of Marine Science and Engineering, Vol. 3, No. 3, 05.08.2015, p. 821-844.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Long wave flow interaction with a single square structure on a sloping beach
AU - Bremm, Gian C.
AU - Goseberg, Nils
AU - Schlurmann, Torsten
AU - Nistor, Ioan
N1 - Cited By :22 Export Date: 1 February 2021
PY - 2015/8/5
Y1 - 2015/8/5
N2 - In the context of dam breaks, tsunami, and flash floods, it is paramount to quantify the time-history of forces by the rapidly transient flow to vertical structures and the characteristics of the induced flow patterns. To resemble on-land tsunami-induced flow, a free-surface-piercing structure is exposed to long leading depression waves in a tsunami flume where long waves run up and down a 1:40 smooth and impermeable sloping beach after its generation by a volume-driven wave maker. The structure and its surrounding were monitored with force transducers, pressure gauges and cameras. Preparatory steady-state experiments were accomplished to determine the drag force coefficient of the square cylinder at various water depths. The flow during wave run-up and draw-down acting on the structure resulted in distinct flow pattern which were characteristic for the type of flow-structure interaction. Besides bow wave propagating upstream, a standing or partially-standing wave was observed in front of the structure together with a wake formation downstream, while a von Kármán vortex street developed during the deceleration phase of the flow motion and during draw-down. Force measurements indicated a sudden increase in the stream-wise total force starting with the arrival of the flow front during initial run-up. Lateral velocities showed significant oscillations in correlation with the von Kármán vortex street development. A comparison of the total measured base force with the analytically-calculated share of the drag force revealed that forces were prevailingly drag-dominated.
AB - In the context of dam breaks, tsunami, and flash floods, it is paramount to quantify the time-history of forces by the rapidly transient flow to vertical structures and the characteristics of the induced flow patterns. To resemble on-land tsunami-induced flow, a free-surface-piercing structure is exposed to long leading depression waves in a tsunami flume where long waves run up and down a 1:40 smooth and impermeable sloping beach after its generation by a volume-driven wave maker. The structure and its surrounding were monitored with force transducers, pressure gauges and cameras. Preparatory steady-state experiments were accomplished to determine the drag force coefficient of the square cylinder at various water depths. The flow during wave run-up and draw-down acting on the structure resulted in distinct flow pattern which were characteristic for the type of flow-structure interaction. Besides bow wave propagating upstream, a standing or partially-standing wave was observed in front of the structure together with a wake formation downstream, while a von Kármán vortex street developed during the deceleration phase of the flow motion and during draw-down. Force measurements indicated a sudden increase in the stream-wise total force starting with the arrival of the flow front during initial run-up. Lateral velocities showed significant oscillations in correlation with the von Kármán vortex street development. A comparison of the total measured base force with the analytically-calculated share of the drag force revealed that forces were prevailingly drag-dominated.
KW - Drag force
KW - Flow-structure interaction
KW - Inertia force
KW - Tsunami on land flow
KW - Vortex shedding
UR - http://www.scopus.com/inward/record.url?scp=84982795639&partnerID=8YFLogxK
U2 - 10.3390/jmse3030821
DO - 10.3390/jmse3030821
M3 - Article
AN - SCOPUS:84982795639
VL - 3
SP - 821
EP - 844
JO - Journal of Marine Science and Engineering
JF - Journal of Marine Science and Engineering
IS - 3
ER -