Abstract
The problem of suspension treatment of subsea oil-gas pipelines has been highly concerned by engineering construction units and researchers. The current research indicates that the bionic sea grass can effectively reduce the flow rate, promote sediment deposition, and control the development of the pipeline suspension area. The velocity distribution of open channel flow with bionic grass is very complex. The height and laying space of bionic grass will affect the flow velocity distribution. At present, the flow velocity in open channels with bionic grass is mainly studied by measuring the velocity variation at the front, middle, and back of bionic grass. Few effective measurements are made for the full velocity field. The velocity field distribution of bionic aquatic grass along the vertical plane is measured by using standard particle image velocimetry (PIV). The effects of height and laying space of bionic grass on probability density distribution, spatial correlation of pulsating velocity, turbulence intensity, Reynolds stress and turbulent kinetic energy in the open channel after the protection section of bionic grass are further analyzed.
Highlights
Bionic grass is processed by a new type of polymer material that is resistant to seawater immersion and long-term erosion [1]
Wilson et al [5] analyzed and compared the effects of leafy and leafless plants on flow turbulence characteristics and found that the maximum Reynolds stress and turbulence intensity of leafy plants appeared in a higher position
Wu et al [6, 7] measured the flow velocity field with rigid and flexible plants by particle image velocimetry (PIV). e analysis found that the turbulence intensity of rigid plants was higher than that of flexible plants
Summary
Bionic grass is processed by a new type of polymer material that is resistant to seawater immersion and long-term erosion [1]. Studies about the full-field velocity of the open channel flow behind the bionic grass protection section are very few; especially, the turbulence characteristics of the flow behind the bionic grass protection section have not been reported. Wilson et al [5] analyzed and compared the effects of leafy and leafless plants on flow turbulence characteristics and found that the maximum Reynolds stress and turbulence intensity of leafy plants appeared in a higher position. The effects of the height and laying density of bionic grass on the flow structure and turbulence characteristics in the open channel behind the protective section of bionic grass are quantitatively analyzed by using the experimental data
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