干旱区生态环境知识资源中心(Arid): Force distribution within a barchan dune

Arid

DOI	10.1063/5.0033964
	Force distribution within a barchan dune
	Alvarez, Carlos A.; Franklin, Erick M.
通讯作者	Franklin, EM (corresponding author), UNICAMP Univ Campinas, Sch Mech Engn, Rua Mendeleyev 200, Campinas, SP, Brazil.
来源期刊	PHYSICS OF FLUIDS
ISSN	1070-6631
EISSN	1089-7666
出版年	2021
卷号	33 期号:1
英文摘要	Barchan dunes, or simply barchans, are crescent-shaped dunes found in diverse environments such as the bottom of rivers, Earth's deserts, and the surface of Mars. In our recent paper [Shape evolution of numerically obtained subaqueous barchan dunes, Phys. Rev. E 101, 012905 (2020)], we investigated the evolution of subaqueous barchans by using the computational fluid dynamics-discrete element method, and our simulations captured well the evolution of an initial pile toward a barchan dune in both the bedform and grain scales. The numerical method having shown to be adequate, we obtain now the forces acting on each grain, isolate the contact interactions, and investigate how forces are distributed and transmitted in a barchan dune. We present force maps and probability density functions for values in the streamwise and spanwise directions and show that stronger forces are experienced by grains at neither the crest nor the leading edge of the barchan but in positions just upstream the dune centroid on the periphery of the dune. We also show that a large part of grains undergo longitudinal forces of the order of 10(-7) N, with negative values around the crest, resulting in decelerations and grain deposition in that region. These data show that the force distribution tends to route a large part of grains toward the crest and horns of subaqueous barchans, being fundamental to comprehend their morphodynamics. However, to the best of the authors' knowledge, they are not accessible from the current experiments, making our results an important step toward understanding the behavior of barchan dunes.
类型	Article
语种	英语
开放获取类型	Green Submitted
收录类别	SCI-E
WOS记录号	WOS:000630429000001
WOS类目	Mechanics ; Physics, Fluids & Plasmas
WOS研究方向	Mechanics ; Physics
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/351314
作者单位	[Alvarez, Carlos A.; Franklin, Erick M.] UNICAMP Univ Campinas, Sch Mech Engn, Rua Mendeleyev 200, Campinas, SP, Brazil
推荐引用方式 GB/T 7714	Alvarez, Carlos A.,Franklin, Erick M.. Force distribution within a barchan dune[J],2021,33(1).
APA	Alvarez, Carlos A.,&Franklin, Erick M..(2021).Force distribution within a barchan dune.PHYSICS OF FLUIDS,33(1).
MLA	Alvarez, Carlos A.,et al."Force distribution within a barchan dune".PHYSICS OF FLUIDS 33.1(2021).