Conference proceeding
Flow, Sediment Entrainment Processes and Drag Forces past Isolated Freshwater Mussels
PROCEEDINGS OF THE 39TH IAHR WORLD CONGRESS, pp.1330-1334
01/01/2022
DOI: 10.3850/IAHR-39WC2521716X2022662
Abstract
The present study investigates how flow and turbulence structure past a partially burrowed freshwater mussel (Lampsilis siliquoidea) are affected by the angle of attack. Numerical simulations are conducted with theta=0(0) corresponding to normal conditions, when the mussel orients itself parallel to the incoming flow, and with theta =30(0) corresponding to highly unsteady (rising) hydrograph conditions, when the flow orientation can change rapidly and the mussel can be subject to larger drag forces that can result in its dislocation from the substrate. For both conditions, simulations are conducted with active filtering (Q(e)=Q(i)=8.94x10(-6) m(3)/s where Q(i) and Q(e) are the mussel filtering volumetric discharges through the incurrent and excurrent siphons). As expected, the mean drag force increases with the magnitude of the angle of attack. Results also show that streamwise-oriented (base) vortices form behind the mussel for both angles of attack. The larger, more coherent vortex induces strong downwelling on one of its sides and pushes higher streamwise velocity fluid near the bed. As a result, a large part of the near-wake region is characterized by bed shear stresses that are larger than those in the incoming flow. Thus, the near wake of a partially burrowed mussel can be subject to local scour.
Details
- Title: Subtitle
- Flow, Sediment Entrainment Processes and Drag Forces past Isolated Freshwater Mussels
- Creators
- Hao Wu - Univ Iowa, Dept Civil & Environm Engn, IIHR Hydrosci & Engn, Iowa City, IA 52240 USAGeorge Constantinescu - Univ Iowa, Dept Civil & Environm Engn, IIHR Hydrosci & Engn, Iowa City, IA 52240 USA
- Contributors
- M Ortega-Sanchez (Editor)
- Resource Type
- Conference proceeding
- Publication Details
- PROCEEDINGS OF THE 39TH IAHR WORLD CONGRESS, pp.1330-1334
- Publisher
- Iahr-Int Assoc Hydro-Environment Engineering Research
- DOI
- 10.3850/IAHR-39WC2521716X2022662
- ISSN
- 2521-7119
- eISSN
- 2521-716X
- Number of pages
- 5
- Grant note
- 1659518 / EAR Hydrologic Sciences Program of the US National Science Foundation under GRANT
- Language
- English
- Date published
- 01/01/2022
- Academic Unit
- IIHR--Hydroscience and Engineering; Civil and Environmental Engineering
- Record Identifier
- 9984580317002771
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