<abstract xml:lang="en" xmlns="http://www.w3.org/1999/xhtml"><p>The paper describes a 3D numerical model of the spherical particle saltation. Two stages of particle saltation were distinguished — the particle free motion in water and the particle-bed collision. The particle motion consists of the translational and rotational particle motion. A stochastic method of calculation of the particle-bed collision was developed. The collision height and the contact point were defined as random variables. Impulse equations were used and the translational and angular velocity components of the moving particle immediately after the collision were expressed as functions of the velocity components just before the collision. The dimensionless coefficients of the drag force and drag torque were determined as functions of both translational and rotational Reynolds numbers. The model is in good agreement with known experimental data. Examples of calculation of the particles' lateral dispersion and the mean absolute values of the deviation angle of the particle trajectory are presented.</p></abstract>

The paper describes a 3D numerical model of the spherical particle saltation. Two stages of particle saltation were distinguished — the particle free motion in water and the particle-bed collision. The particle motion consists of the translational and rotational particle motion. A stochastic method of calculation of the particle-bed collision was developed. The collision height and the contact point were defined as random variables. Impulse equations were used and the translational and angular velocity components of the moving particle immediately after the collision were expressed as functions of the velocity components just before the collision. The dimensionless coefficients of the drag force and drag torque were determined as functions of both translational and rotational Reynolds numbers. The model is in good agreement with known experimental data. Examples of calculation of the particles' lateral dispersion and the mean absolute values of the deviation angle of the particle trajectory are presented.

3D Numerical Model of the Spherical Particle Saltation in a Channel with a Rough Fixed Bed

Institute of Hydrodynamics of Academy of Sciences of the Czech Republic, v. v. i., Pod Patankou 30/5, 166 12 Prague 6, Czech Republic; Mailto

Journal of Hydrology and Hydromechanics

The paper describes a 3D numerical model of the spherical particle saltation. Two stages of particle saltation were distinguished — the particle free motion in...

3D Numerical Model of the Spherical Particle Saltation in a Channel with a Rough Fixed Bed

Pubblicato online: 10 giu 2009

Pagine: 100 - 112

DOI: https://doi.org/10.2478/v10098-009-0009-x

Parole chiave
3D model saltace, pohyb splavenin, kolise částice-dno, rotace částic, příčná disperze částic

This content is open access.

3D Numerical Model of the Spherical Particle Saltation in a Channel with a Rough Fixed Bed

Pubblicato online: 10 giu 2009

Pagine: 100 - 112

DOI: https://doi.org/10.2478/v10098-009-0009-x

Parole chiave3D model saltace, pohyb splavenin, kolise částice-dno, rotace částic, příčná disperze částic

This content is open access.

Parole chiave
3D model saltace, pohyb splavenin, kolise částice-dno, rotace částic, příčná disperze částic