Hydraulics & Waterways

Oral

398009 - 3D numerical simulation of local morphodynamics around complex in-stream structures

Thursday, June 7
8:30 AM - 10:00 AM
Location: Regency Room

In-stream structures are often designed for ecological and hydraulic purposes in stream restoration practice. The geometries of in-stream structures are typically very complex and irregular, for example, the engineered logs to mimic the large woody debris (LWD) in natural streams. This study is aimed to predict the sediment transport and bed morphological changes induced by the complex in-stream structures. The computational model, which couples the hydrodynamics and morphodynamics, is developed in OpenFOAM. The hydrodynamics part is flexible in the choice of turbulent models to capture the detailed local turbulent flows. The morphodynamics part uses an immersed boundary (IB) method to dynamically describe the geometrical deformation of the local river bed. The use of IBM eliminates the need of deforming the mesh, which is a very complex task and hinders the 3D scour modeling. A case study is presented to study the geomorphology around an engineered log jam (ELJ), which consists of multiple logs piled together. The numerical results of local turbulence and local morhphodynamics are compared with the experimental measurement in literature.

Yuncheng Xu

Research Assistant
Pennsylvania State University

I am a senior PhD student at Penn State University, working with Dr. Xiaofeng Liu. My focus is using CFD technique to investigate hydraulic problems in rivers and streams. Recently, I am developing a numerical model using immersed boundary method to simulate the hydrodynamics and morphodynamics around complex in-stream structures.

Presentation(s):

Send Email for Yuncheng Xu

Xiaofeng Liu, PhD, PE

Assistant Professor
Pennsylvania State University

Xiaofeng Liu got his bachelor's degree in Hydraulic Engineering from Tsinghua University, China and master's degree in Environmental Science from Peking University, China. He then got his PhD at University of Illinois at Urbana-Champaign (UIUC).He is now an assistant professor at Penn State University. His research area includes computational hydraulics, sediment transport, and erosion.

Presentation(s):

Send Email for Xiaofeng Liu


Assets

398009 - 3D numerical simulation of local morphodynamics around complex in-stream structures



Attendees who have favorited this

Please enter your access key

The asset you are trying to access is locked. Please enter your access key to unlock.

Send Email for 3D numerical simulation of local morphodynamics around complex in-stream structures