It is my pleasure to announce the next Palabos Online Seminar.
Date and Time: Wednesday August 4th, 10:00 am CET
Participation Link: Zoom link
Palabos Online Seminar home page: https://palabos.unige.ch/community/palabos-online-seminar-series/
Speaker: Dr. Helen Morrison
Title: Towards simulating the mobilization of objects on the sea floor
Sediment transport plays a major role in the potential mobilization of objects on the sea floor, as different phenomena can lead to scour, burial or even the complete exposure of an object and thus subject it to mobilization due to currents or waves. The presentation will focus on a sediment transport model based on the lattice Boltzmann (LB) method which is capable of predicting the influence of a unidirectional flow field on the development of the sand bed in the vicinity of arbitrarily shaped objects, even under turbulent conditions and relatively low resolution. The fluid phase of the simulation makes use of the 3D entropic multi-relaxation time collision model. For the simulation of the sediment transport, the advection–diffusion equation is solved via the LB method with an adapted version of the entropic multi-relaxation time collision model for a D3Q7 lattice. Erosion and sedimentation processes are included based on the critical Shields parameter, i.e. on the wall shear stress. Additionally, a brief outlook on our current project will be given, which aims at extending the presented model to incorporate different sediment transport phenomena and the actual movement of objects.
Figure: Erosion and sedimentation around a horizontally bedded finite cylinder as obtained from a combined fluid flow and sediment transport simulation using the LB method.
Speaker Bio :
Dr. Helen Morrison is currently a postdoctoral researcher at Corvus Works UG (closely connected to the University of Rostock, Germany). She graduated in Physics with a focus on Astronomy and Computer Science from the University of Heidelberg (Germany) and completed her PhD in Fluid Mechanics at the University of Rostock. She uses the Lattice Boltzmann Method to focus on high Reynolds number flows, sediment transport and fluid structure interactions and currently mainly focuses on the interaction between sediment processes on the sea floor and unexploded ordnance.