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National Repository of Grey Literature 14 records found  previous11 - 14  jump to record: Search took 0.00 seconds. 
3D mathematical model of spherical particle saltatory movement in open channel with rough bed
 Lukerchenko, Nikolay ; Chára, Zdeněk ; Vlasák, Pavel
One of the main modes of bed load transport is saltation when particles hop up from the bed and follow ballistic-like trajectories. Mathematical models of saltation are mostly two-dimensional although the particle motion is actually three-dimensional. The aim of the present study is development of the 3D mathematical model of solid particle saltatory motion over rouhg bed in an open channel.
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Collision with bed and magnus effect in numerical simulation of solid particle saltation over rough bed
 Lukerchenko, Nikolay ; Chára, Zdeněk ; Vlasák, Pavel
The particle motion in an open channel over rough bed is consider. Mainly the process of collision with the bed controls the particle angular velocity. Conditions of the particle-bed collision is discussed. Particle parameters after its collision with bed are calculated based on parameters before collision.
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Numerický 3D model kolize pevné částice s drsným dnem kanálu
 Lukerchenko, Nikolay ; Chára, Zdeněk ; Vlasák, Pavel
The paper deals with 3D numerical model of the random process of rotating spherical particle-bed impact and rebound for saltation movement of a particle in channels with rough bed. The collision height and the contact point are defined as random variables of the collision process. The collision height depends on bed roughness. The contact point position depends on the irection of the particle velocity vector before the collision
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Experimentální výzkum odporu rotačně se pohybující kulové částice
 Lukerchenko, Nikolay ; Kvurt, Y. ; Chára, Zdeněk ; Vlasák, Pavel
Saltatory solid particles conveyed by fluid impact a channel bed from time to time. As a result of the collision the particles receive angular velocity, which gradually decreases with time. For numerical simulation of saltation it is necessary to know values of the drag rotation coefficient. In this paper experimental results of the rotating spherical particles moving in water are described. The rubber spherical balls with density near that of water were used; each of them was speeded up in a special chute that ensured that the particle rotated in a given plane. Values of the drag coefficient of the rotating spherical particle were determined in a dependence on rotation particle Reynolds number
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