Show simple item record

dc.contributor.authorDing, Yangen_US
dc.date.accessioned2013-01-17T21:52:16Z
dc.date.available2013-01-17T21:52:16Z
dc.date.issued2011-11-14en_US
dc.identifier.urihttp://hdl.handle.net/1853/45880
dc.description.abstractUnderstanding animal locomotion requires modeling the interaction of the organism with its environment. Locomotion within granular media like sand, soil, and debris that display both solid and fluid-like behavior in response to stress is less studied than locomotion within fluids or on solid ground. To begin to reveal the secrets of movement in sand, I developed models to explain the subsurface locomotion of the sand-swimming sandfish lizard. I developed a resistive force theory (RFT) with empirical force laws to explain the swimming speed observed in animal experiments. By varying the amplitude of the undulation in the RFT, I found that the range of amplitude used by the animal predicted the optimal swimming speed. I developed a numerical model of the sandfish coupled to a discrete element method simulation of the granular medium to test assumptions in the RFT and to study more detailed mechanics of sand-swimming. Inspired by the shovel-shaped head of the sandfish lizard, I used the simulation to study lift forces in granular media: I found that when a submerged intruder moved at a constant speed within a granular medium it experienced a lift force whose sign and magnitude depended on the intruder shape. The principles learned from the models guided the development of a biologically inspired robot that swam within granular media with similar performance to the lizard.en_US
dc.publisherGeorgia Institute of Technologyen_US
dc.subjectLiften_US
dc.subjectGranular mediaen_US
dc.subjectSimulationen_US
dc.subjectResistive forceen_US
dc.subjectLocomotionen_US
dc.subjectSwimmingen_US
dc.subjectSandfishen_US
dc.subject.lcshAnimal locomotion
dc.subject.lcshGranular materials
dc.titleSimulation and theoretical study of swimming and resistive forces within granular mediaen_US
dc.typeDissertationen_US
dc.description.degreePhDen_US
dc.contributor.departmentPhysicsen_US
dc.description.advisorCommittee Chair: Goldman, Daniel; Committee Member: Cvitanovic, Predrag; Committee Member: Hu, David; Committee Member: Kim, Harold; Committee Member: Wiesenfeld, Kurten_US


Files in this item

Thumbnail

This item appears in the following Collection(s)

Show simple item record