Particle Collision Model for Arbitrary Smooth Shapes
Abstract
Many rivers worldwide suffer from disturbed sediment dynamics due to human and climate impacts. Understanding sediment processes in rivers is a prerequisite for developing efficient sediment management strategies. When dealing with sediment transport processes in rivers most researchers use a standard or modified form of the critical Shields parameter to predict the incipient motion of a grain size of interest. Despite the wide use of this concept, many studies reveal the apparent lack of a precise threshold value. Rather than the temporally and spatially averaged shear stress at the reach scale, instantaneous forces acting on the grain are responsible for its mobilization. Moreover, particle-particle interactions are a main contributor to sediment entrainment and should thus be explored. The interplay of a fluid (e.g. water) with a solid body (e.g. sediment grains) is modeled in the field of fluid-structure-interactions (FSI). If particle-particle collisions need to be considered additional equations have to be solved. The novel 4D-PTV method for high-resolution spatio-temporal measurements of the flow is an excellent way to study FSI problems experimentally. Collision models between spherical objects and spheroidal objects have been developed recently. Despite the fact that the key role of arbitrary shaped objects and polydisperse particles has been acknowledged in recent publications experimental and numerical studies for high Reynolds number flows and polydisperse arbitrary shaped particles do not yet exist to the best of the authors' knowledge. The overall project aim is to study collisions which occur in riverine systems and to develop an appropriate collision model. This requires to investigate collisions of arbitrary shaped particles at oblique angles, for diverse Stokes numbers and high Reynolds numbers. Our approach is threefold. We combine (1) cutting-edge experimental high resolution spatio-temporal 4D-PTV measurements to (2) develop a mathematical lubrication model and (3) implement a numerical collision model based on an immersed boundary method FSI code.
sediment transport collision model fluid structure interaction 3D PTV
Publikationen
Project staff
Christine Sindelar
Priv.-Doz. Dipl.-Ing. Mag. Dr.techn. Christine Sindelar
christine.sindelar@boku.ac.at
Tel: +43 1 47654-81944
Project Leader
01.05.2020 - 30.09.2023
Helmut Habersack
Univ.Prof. Dipl.-Ing. Dr.nat.techn. Dr.h.c. Helmut Habersack
helmut.habersack@boku.ac.at
Tel: +43 1 47654-81901, 81911
Sub Projectleader
01.05.2020 - 30.09.2023
Thomas Gold
Dipl.-Ing. Thomas Gold
thomas.gold@boku.ac.at
Tel: +43 1 47654-81937
Project Staff
01.05.2020 - 30.09.2023
Kevin Reiterer
Dipl.-Ing. Kevin Reiterer
kevin.reiterer@boku.ac.at
Tel: +43 1 47654-81937
Project Staff
01.05.2020 - 30.09.2023
Dominik Worf
Dipl.-Ing. Dominik Worf
dominik.worf@boku.ac.at
Tel: +43 1 47654-81937
Project Staff
01.05.2020 - 30.09.2023
BOKU partners
External partners
Stony Brook University_x000D_ Department of Civil Engineering_x000D_
Asst. Prof. Ali Khosronejad
partner