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19篇 您的检索式:作者名="Umbanhowar"
    题名 作者 年代 出处 被引量
1Discrete element simulation of cylindrical particles using super-ellipsoids显示文摘A discrete element model based on super-ellipsoids was used to simulate cylindrical particle flow. The model can describe a cylindrical particle accurately provided the shape indices of the super-ellipsoids are set to appropriate values. To achieve more rapid calculations, we implemented an 'oriented bounding box algorithm'(OBBA) for the initial contact detection of cylindrical particles. Several types of Simulations were performed to validate the super-ellipsoid model and the contact-detection algorithm. First, the effect of shape index of the super-ellipsoids on model accuracy was investigated through three simulations: impact of a cylindrical particle on a flat wall, flow of cylindrical particles in a rotating tumbler, and segregation of cylindrical particles of different length flowing down a bounded heap. The simulation results show that the super-ellipsoids describe cylindrical particles accurately when the shape index that specifies the sharpness of the cylinder edges is sufficiently large. The efficiency of the OBBA is measured by simulations in which a box is filled with cylindrical particles and a tumbler that contains cylindrical particles is rotated. The simulation results show that the OBBA can accelerate the calculations significantly. The effect of particle shape (such as aspect ratio and shape index) on the calculation speed was obtained. The simulation of rod-like particles tended to take more calculation time than that of disk-like particles, and the simulation time increased with an increasing particle-shape index.Yongzhi Zhao Lei Xu Paul B. Umbanhowar Richard M. Lueptow 2019Particuology2019,17,5:12
2Recent fire history of the northern Great Plains显示文摘UMBANHOWAR C E 1996American Midland Naturalist1996,135,:1
3Monodisperse e- mulsion generation via drop break off in a coflowing stream 显示文摘Umbanhowar P B Prasad V Weitz D A 2000Langmuir2000,16,2:1
4Scaling and dynamics of sphere and disk impact into granular media显示文摘Goldman D I Umbanhowar P 2008PhysicalReview E2008,77,02:1
5An effective gravitational temperature for sedimentation显示文摘Segre P N Liu F Umbanhowar P 2001Nature2001,409,:1
6Undulatory swimming in sand:experimental and simulation stud- ies of a robotic sandfish 显示文摘MALADEN R D DING Yang UMBANHOWAR P B 2011The International Journal of Robotics Research2011,30,7:1
7Force and flow transition in plowed granular media 显示文摘GRAVISH N UMBANHOWAR P B GOLDMAN D I 2010Physical Review Letters2010,105,12:1
8Force and flow transition in plowed granular media显示文摘GRAVISH N UMBANHOWAR P B GOLDMAN D I 2010Physi- cal review letters2010,105,12:1
9Modelinggranular materials: A test bed for framing and analysis 显示文摘UMBANHOWAR P B LUEPTOW R M OTTINO J M 2013AicheJournal2013,59,9:1
10Localized excitations in a vertically vibrated granular layer显示文摘Umbanhowar P B Melo F and Swinney H L 1996Nature1996,382,:1
11A meta-analysis of context-dependency in plant response to inoculation with mycorrhizal fungi显示文摘Hoeksema J D Chaudhary V B Gehring C A Johnson N C Karst J Koide R T Pringle A Zabinski C Bever J D Moore J C Wilson G W T Klironomos J N Umbanhowar J 2010Ecology Letters2010,13,3:1
12Scaling and dy- namics of sphere and disk impact into granular media 显示文摘GOLDMAN D I UMBANHOWAR P 2008Physical Review E2008,77,02:1
13Undulatory swimming in sand: experimental and simula- tion studies of a robotic sandfish 显示文摘MALADEN R D DING Y UMBANHOWAr P B 2011The International Journal of Robotics Research2011,30,7:1
14MonodisperseEmulsion Generation Via Drop Break Off in a CoflowingStream显示文摘Umbanhowar P B Prasad V Weitz D A 2000Langmuir2000,16,2:1
15Monodisperse emulsion generation via drop break off in a coflowing stream显示文摘UMBANHOWAR P B PRASAD V WEITZ D A 2000Langmuir2000,16,2:1
16Monodisperse emulsion generation via drop break off in a coflowing stream显示文摘Umbanhowar PB Prasad V Weitz DA 0,,2:1
17Undulatory swimming in sand: Experimental and sim- ulation studies of a robotic sandfish显示文摘MALADEN P D DING Y UMBANHOWAR P B 2011The Interna- tional Journal of Robotics Research2011,30,7:1
18Monodisperse emulsion generation via drop break off in a coflowing stream 显示文摘Umbanhowar P B Prasad V Weitz D A 2000Langmuir2000,16,2:1
19Revegetation of earthen mounds along a topographic productivity gradient in a northern mixed prairie显示文摘Umbanhowar C E 1995Journal of Vegetation Science1995,6,:1
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