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Research

Flows at Environmental Interfaces and Renewable Energy

Our research focuses on measurement and prediction of environmental boundary-layers (EBLs). EBLs include atmospheric boundary-layers (ABLs), ocean and lake surface boundary-layers—also called the surface mixed layer—(SBL), and benthic boundary-layers (BBLs), as well as river and tidal flows. Generally, EBLs are characterized by rough, heterogeneous surfaces, multi-scale topography or bedforms, tall vegetation and variations in surface heat and scalar fluxes, all of which impact the turbulence dynamics and surface fluxes to varying degrees. The study of EBL dynamics utilizes numerical techniques such as large-eddy simulation (LES) and experimental boundary-layer turbulence studies, both at the field scale and in the laboratory. Applications include most problems dealing with air and water resource sustainability, land-atmosphere and air-water interactions, and renewable energy.

Specific Questions

topocnpylakeIn particular, we focus on complex environmental flows and turbulence transport in separated or wake embedded boundary layer flows. Examples include flow over canopy transitions, over and around buildings, wind turbines, over steep topography, and in the presence of surface wave fields. The goal is to better understand interfacial fluxes of momentum, heat, water vapor, and trace gasses, and provide more reliable inputs to ecosystem,  lake, climate, weather, pollution, and renewable energy resource models; to improve micrometeorological flux measurements; and to test and improve LES sub-grid scale and land surface boundary parameterizations for EBL simulations over complex surfaces.

Methods

We conduct research using the experimental facilities and computational resources of IIHR—Hydroscience & Engineering, employing an interdisciplinary approach and a combination of:

  • Controlled experimental turbulence research in wind tunnels and water channels (using hot-wire anemometry, laser Doppler velocimetry (LDV), and particle image velocimetry (PIV)),
  • Full-scale field measurements (using sonic and acoustic Doppler velocimetry (ADV) and Doppler LIDAR), and
  • Numerical modeling (using Mesoscale atmospheric models like WRF and LES).

We use measurements and simulations conducted at a range of scales along with perspectives from earth and engineering sciences to improve fundamental understanding, as well as to develop useful models that can be employed by scientists, engineers, planners, and policy makers.

 

Ongoing Research Projects

See highlights of some of our fundamental and applied research related to alternative forms of renewable energy are supported by IIHR Engineering Services.

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Research Support

This research is supported by the National Science Foundation, NASA, and USGS. Additional support is provided by the Iowa Energy Center, MidAmerican Energy Company, Iowa Department of Transportation, Center for Global & Regional Environmental Research (CGRER), Center for Health Effects of Environmental Contamination (CHEEC), Iowa Dept. of Natural Resources, and Iowa Lakeside Laboratory. Computational resources are provided by IIHR—Hydroscience & Engineering’s Research Computing Services.

Last modified on April 11th, 2020
Posted on September 24th, 2014