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Large-eddy simulation of flows and scalar dispersion over surface discontinuities

chengwc - Posted on 14 April 2017

Project Description: 

The aim of this project is to use large-eddy simulation (LES) results of atmospheric boundary layer (ABL) flows above inhomogeneous surface (e.g., rural-to-urban surfaces transition) to investigate and develop simple models for the scalar dispersion pattern at surface transition regions.

Researcher name: 
Cheng Wai Chi
Researcher position: 
Senior Research Associate
Researcher department: 
Mechanical Engineering
Researcher email: 
chengwc@hku.hk
Researcher name: 
Dr. Chun-ho Liu
Researcher position: 
Associate Professor
Researcher department: 
Mechanical Engineering
Researcher email: 
chliu@hkucc.hku.hk
Research Project Details
Project Duration: 
04/2017 to 31/12/2017
Results Achieved: 
The research team have been participating in ABL plume dispersion since the 2000’s using Reynolds-averaged Navier- Stokes (RANS) models (Liu and Leung 2001b), LES (Wong and Liu 2013) and direct numerical simulation (DNS; Liu and Leung 2005, 2006a, 2006b). Major findings included: 1. Plume meandering in unstable stratification (Chan and Liu 2013a, 2015); 2. Modification of (vertical) dispersion coefficient σz by the aerodynamic resistance of rough surfaces (Ng and Liu 2013a, 2013b; Ho et al. 2015); and 3. Influence of pollution physics/chemistry coupling in photostationary state (Chung and Liu 2013) and plume dispersion (Du et al. 2014).