A5077059338- Coastal and Marine Dynamics
- Wave and Wind Energy Systems
- Ocean Waves and Remote Sensing
- Fluid Dynamics Simulations and Interactions
- Hydrology and Sediment Transport Processes
- Hydraulic flow and structures
- Tropical and Extratropical Cyclones Research
- Earthquake and Tsunami Effects
- Fluid Dynamics and Vibration Analysis
- Coastal wetland ecosystem dynamics
- Geological formations and processes
- Microplastics and Plastic Pollution
- Fluid Dynamics and Turbulent Flows
- Offshore Engineering and Technologies
- Fluid Dynamics and Heat Transfer
- Vibration and Dynamic Analysis
- Wind and Air Flow Studies
- Marine and Offshore Engineering Studies
- Aeolian processes and effects
- Advanced X-ray and CT Imaging
- Soil erosion and sediment transport
- Lattice Boltzmann Simulation Studies
- Geotechnical Engineering and Underground Structures
- Recycling and Waste Management Techniques
- Flow Measurement and Analysis
Technical University of Denmark
2015-2024
Oklahoma State Department of Health
2023
Bridge University
2023
Intermountain Healthcare
2023
University of Utah
2023
California Maritime Academy
2011-2020
University of Copenhagen
2017
DHI
2001-2011
Danish Hydraulic Institute (India)
1998-2009
University of Bologna
2004
The settling velocities of 66 microplastic particle groups, having both regular (58) and irregular (eight) shapes, are measured experimentally. Regular shapes considered include: spheres, cylinders, disks, square plates, cubes, other cuboids (square rectangular prisms), tetrahedrons, fibers. experiments generally consider Reynolds numbers greater than 102, extending the predominant range covered by previous studies. present data is combined with an extensive set from literature,...
A numerical model is developed to investigate the flow in porous media, for purposes of simulating scour protection around coastal and offshore structures. In present model, Volume-Averaged Reynolds Averaged Navier-Stokes (VARANS) equations are solved, coupled with volume-averaged k-ω turbulence closure. The derived by taking spatial average standard equations. unknown coefficients caused averaging procedure determined large eddy simulation (LES). validated against existing experimental...
This paper presents experimental measurements of beaching times for buoyant microplastic particles released, both in the pre-breaking region and within surf zone. The are used to quantify cross-shore Lagrangian transport velocities microplastics. Prior breaking travel onshore with a velocity close fluid particle velocity, regardless characteristics. In zone microplastics increase become closer wave celerity. Furthermore, it is demonstrated that having low Dean numbers (dimensionless fall...
This paper presents experimental results on the cross-shore distribution of non-buoyant microplastic particles under irregular waves propagating, shoaling and breaking live sediment sloping beds. Eighteen particle groups having various shapes, densities, sizes are tested. The experiments consider two initial bottom configurations corresponding to a (i) plane bed (ii) pre-developed singly-barred profile (more representative field conditions). Four different accumulation hotspots identified:...
Loads from extreme waves can be dimensioning for the substructures of offshore wind turbines. The DeRisk project (2015-2019) aims at an improved load evaluation procedure through application advanced wave models, laboratory tests effects, development hydrodynamic aero-elastic response calculations and statistical analysis. This first paper outlines content philosophy behind DeRisk. Next, results with irregular are presented, including 2D 3D focused groups. group a 6-hour (full scale...
Incipient motion conditions for 57 regular (spheres, cylinders, disks, square plates, cubes, prisms, rectangular tetrahedrons, and fibers) eight irregular microplastic particle groups, having various sizes densities, are investigated in a circular flume. The present data set is combined with additional from the literature systematically analyzed. A new framework developed predicting incipient foreign particles, accounting variations static friction, hydraulic roughness, hiding-exposure...
The flow processes in a scour protection around monopile steady current are described relation to transport of sediment the based on physical model tests. consisted uniformly distributed coarse stones without filter layer. Transport may cause sinking protection. This reduce stability and change for instance natural frequency dynamic response an offshore wind turbine unfavourable manner. most important process with regard is found be horseshoe vortex. It that larger pile diameter relative...
Compared to the dual energy scintillator detectors widely used today, pixelated multispectral X-ray show potential improve material identification in various radiography and tomography applications for industrial security purposes. However, detector effects, such as charge sharing photon pileup, distort measured spectra high flux detectors. These effects significantly reduce detectors' capabilities be identification, which requires accurate spectral measurements. We have developed a semi...
A Large Eddy Simulation (LES) of (1) a fully developed turbulent wave boundary layer and (2) case 1 subject to ventilation (i.e., suction injection varying alternately in phase) has been performed, using the Smagorinsky subgrid‐scale model express subgrid viscosity. The was found reproduce experimental results well. However, 1, near‐bed ensemble averaged velocity is underestimated during acceleration stage, probably due not being able capture physics well that region. Also, there general...