Research

Sheng’s research group (LAEBI) develops and utilizes advance multi-dimensional multi-species experimental methods to study flow structure interactions (FSI) in unsteady conical flows over deforming boundaries, turbulence wall interactions, environmental boundary layer, microscale flows, hydrodynamic interactions of microorganisms and surface, hydrodynamics of swimming and bio-mimetic locomotion, and biomedical related near surface transport.

Applications include flow control and drag management using actuated surfaces for MAV, microscale coherent structure identification in rough wall turbulent boundary layer, hydrodynamics of bacterial biofilm formations and irrigations, hydrodynamic interactions between physical environment and biological system, cardiovascular flows, transport of micro-circulations, and intra-cellular micro-fluidics. Professor Sheng’s research focuses first on advancing the latest experimental techniques: 3-D holographic PIV, tomographic PIV, digital holographic microscopy, 3-D fluorescent light field microscopy and volumetric flow accelerometer.

The primary objective is to establish the capabilities in obtaining high resolution 3-D and multiple component measurement. The research also emphasizes on applying these new techniques to advances our understanding of flow wall interactions with strong engineering and biomedical implications. Current projects focus on near wall flow structure manipulation via a moving surface with roughness element, developing measurement method to understand two-way coupling of unsteady flow and deforming vascular wall, hydrodynamic interactions of bacteria with the wall during biofilm formation and biofilm irrigation using micro-fluidics, and multi-scale investigation of planktonic flows during predation.

Our research has the following foci:

  1. Development of Experimental Technologies:
    • Digital Holographic Microscopy for biological and turbulent Flows
    • High Speed PIV and Tomographic PIV
    • 3D fluorescence imaging
    • Field oceanography instrumentation
    • Microfluidics for droplet handling and manipulation
    • Nano-/Micro-fabrication techniques for surface functionalization
    • Fabrication technology for creating micro-fibular structures
  2. Flow Structure Interactions:
    • Vascular hemodynamics and aneurysm formation
    • Turbulence and wall bounded flows
    • Wake flow and aero-acoustics by the advanced energy system, e.g. HAWT
    • Flow control using bio-inspired surfaces
    • Field experimentation of wind turbines.
  3. Bio-Physical Interactions near Complex Boundaries:
    • Bioflim initiation and formation
    • Chemotaxis, quorum sensing and toxin delivery in-situ
    • Hydrodynamic interactions of micro-organisms with complex boundaries: walls, interfaces
      Transport near oil-water interfaces
    • Cell attachment and detachment over complex surfaces or interfaces.