“Turbulence – Resolving Two – Phase Flow Simulations of Wave – and Current Supported Turbidity Flows”

 

This Friday, March 31, 2017 the College of the Coast & Environment will be hosting Dr. Celalettin Emre Ozdemir from the Department of Civil Engineering, LSU for the Spring CC&E Seminar Series. Dr. Ozdemir’s topic for the seminar will be “Turbulence – resolving two – phase flow simulations of wave – and current supported turbidity flows.” Please join us in the Dalton J. Woods Auditorium for this very informative talk.

Abstract

Wave- and current-supported turbidity currents are new class of turbidity flows that has been discovered over the last three decades. Its significance as a carrying agent of fine sediments over low-gradient shelves has been recognized with growing evidence. Due to their vertical length scales, which are on the order of decimeters, understanding the full range of mechanisms that are responsible for and/or affect these currents cannot proceed without turbulence-resolving numerical simulations and/or high-resolution sensor deployment in a laboratory/field experiments. In this talk the culmination of two-phase, turbulence-resolving simulations, i.e. Direct Numerical Simulations (DNS), of wave- and alongshore current-supported fine sediment turbidity currents across mild bathymetric slopes will be presented. Simulation results show that such turbidity currents follow a logarithmic velocity profile across the shelf whose parameters depend on the sediment concentration, across-shore bathymetric slope, and Reynolds number while it is independent of the settling velocity of the sediments. The numerical simulations also provide significant insights on modelling these turbidities in a regional-scale model which can be used to estimate the location of mud depocenters and the dynamics of submarine geomorphology such as in the clinoform development at the continental margin.

Bio

Celalettin E. Ozdemir, is an Assistant Professor in Civil and Environmental Engineering (CEE) at the Louisiana State University (LSU) since August 2014 with joint appointment to LSU’s Center for Computation and Technology (CCT). He earned his Ph.D. from Civil Engineering Department at University of Florida in 2010. Prior to his appointment in LSU he worked as a postdoctoral investigator at Applied Coastal Research Laboratory in University of Delaware and Woods Hole Oceanographic Institution. He has over 10 years of expertise in the development and application of turbulent multiphase flows and CFD models that address coastal sediment transport over complex topography and structures.

Lunch will be provided immediately following the seminar in the conference room next to the auditorium.

Time: 11:30 a.m. – 12:15 p.m.
Where: Dalton J. Woods Auditorium
LSU Energy, Coast, and Environment Building