Drag and Added-Mass Coefficients of Large Sandbags
Publication: Journal of Hydraulic Engineering
Volume 137, Issue 11
Abstract
Experimental investigations to understand the mechanics of motion of large sandbags and to simulate their settling behaviors are reported in this paper along with the details of experimental setup and procedures. Two high-definition charge-coupled device (CCD) cameras recorded the motion of the sandbags from the side of a glass water tank and a digital particle tracking velocimetry (DPTV) technique was used to determine the settling velocity of the bags. The drag and added-mass coefficients are estimated for the sandbags and the values of the added-mass coefficient are compared to those for solid spheres. The unit weight adjustment and the drag coefficient adjustment approaches are investigated for simulating the settling behavior of permeable sandbags. The results show that the unit weight adjustment approach gives better results than the drag coefficient adjustment approach, if the reduction in the drag coefficient because of porosity is taken into consideration and the effect of permeability of the sandbag on the drag coefficient is small and neglected. An exponential equation to estimate the percentage increase of the unit weight for the permeable sandbags is presented.
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Acknowledgments
The authors thank the National Science Foundation for the financial support under the PIRE program, Grant No. NSFOISE 0730246. Any opinion, findings, and conclusions or recommendations expressed in this paper are those of the authors and do not reflect the views of the National Science Foundation.
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Information & Authors
Information
Published In
Journal of Hydraulic Engineering
Volume 137 • Issue 11 • November 2011
Pages: 1441 - 1451
Copyright
© 2011 American Society of Civil Engineers.
History
Received: Mar 26, 2010
Accepted: Mar 2, 2011
Published online: Mar 4, 2011
Published in print: Nov 1, 2011
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