Extension and application of quasi-Direct Numerical Simulation to Bedload Sediment Transport
| Project/Area Number |
23560612
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Multi-year Fund |
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| Section | 一般 |
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| Research Field |
Hydraulic engineering
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| Research Institution | Ritsumeikan University |
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Principal Investigator |
WELLS John C. 立命館大学, 理工学部, 教授 (60301644)
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| Project Period (FY) |
2011 – 2013
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| Project Status |
Completed (Fiscal Year 2013)
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| Budget Amount *help |
¥5,330,000 (Direct Cost: ¥4,100,000、Indirect Cost: ¥1,230,000)
Fiscal Year 2013: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2012: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2011: ¥2,860,000 (Direct Cost: ¥2,200,000、Indirect Cost: ¥660,000)
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| Keywords | 砂リップル / 数値シミュレーションの検証 / 潤滑論 / 粒子同士衝突 / 流体力 / 固体液体相対作用 / DNS / contact modelling / lubrication force / surface roughness / free surface / fluid force / bedload transport / ripple formation / particle sorting / sorting / seiving |
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| Research Abstract |
(1) To provide benchmark data for numerical simulations of sediment ripple formation, we executed a small-scale rotating drum experiment and analyzed video recordings. The resulting data provided previously unavailable data for particle Reynolds number less than 2.5, i.e. in the "hydraulically smooth" regime. Also, the drum was more than 4 times smaller than in previous research, which will allow easier comparison with highly-resolved numerical simulations
(2) We provided a theoretical estimate of the importance of fluid inertia in the gap between colliding particles, which has been neglected in earlier modelling and analysis of immersed particle rebound.
(3) We developed integral relations that will be applicable to precisely compute the force on a solid particle near a free surface and other fixed or moving solid bodies.
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Report
(4 results)
Research Products
(21 results)
