A5053929890- Coastal and Marine Dynamics
- Hydrology and Sediment Transport Processes
- Fluid Dynamics and Turbulent Flows
- Geological formations and processes
- Oceanographic and Atmospheric Processes
- Marine and fisheries research
- Geotechnical Engineering and Underground Structures
- Tropical and Extratropical Cyclones Research
- Oil Spill Detection and Mitigation
- Fluid Dynamics and Vibration Analysis
- Aeolian processes and effects
- Ocean Acidification Effects and Responses
- Particle Dynamics in Fluid Flows
- Ocean Waves and Remote Sensing
- Marine and environmental studies
- Coral and Marine Ecosystems Studies
- Offshore Engineering and Technologies
- Plant Water Relations and Carbon Dynamics
- Granular flow and fluidized beds
- Marine and coastal ecosystems
- Advanced Numerical Analysis Techniques
- Traffic control and management
- Marine Bivalve and Aquaculture Studies
- Gas Dynamics and Kinetic Theory
- Lattice Boltzmann Simulation Studies
University of Puerto Rico-Mayaguez
2014-2024
University of New Hampshire
2013
A three-dimensional model that couples Reynolds–averaged Navier–Stokes equations with an advection–diffusion solver for flow and concentration fields over a fixed, non-permeable boundary is presented. The simulates oscillatory wavy wall constant scalar source to assess the effects of boundary-induced pressure gradient on passive mixing. Results were compared experimental data collected in oscillating tray facility. Hydrodynamic quantities are favourable agreement observations. captured...
A three‐dimensional mixture theory model for flow and sediment transport in the seafloor boundary layer, SedMix3D, simulated over resulting entrainment evolution of rippled beds. SedMix3D treats fluid‐sediment as a continuum varying density viscosity with concentration velocity by Navier‐Stokes equations coupled flux equation mixture. Model validation was performed comparing time‐dependent quantities bulk statistics measurements obtained laboratory under scaled forcing conditions....
[1] Observations of the spatially dependent velocity field over movable bed forms subjected to slightly skewed and asymmetric regular wave forcing were collected. The dynamics between ripple elements is dominated by coherent vortices, characterized swirling strength, evidenced in temporal spectral characterization. Within boundary layer, energy second harmonic (3f0) amplified at slopes consistent with location expected strongest pressure gradients. First-moment second-moment statistics used...
Abstract Observations of the nearbed velocity field over a rippled sediment bed under asymmetric wave forcing conditions were collected using submersible particle image velocimetry (PIV) system. To examine role form‐induced dynamics in total momentum transfer, double‐averaging technique was implemented on two‐dimensional time‐dependent by means full equation. This approach allows for direct determination stresses, i.e., stresses that arise due to presence forms, which are zero flat...
Abstract Time series from open ocean fixed stations have robustly documented secular changes in carbonate chemistry and long‐term acidification (OA) trends as a direct response to increases atmospheric carbon dioxide (CO 2 ). However, few high‐frequency coastal time are available reef systems, where most affected tropical marine organisms reside. Seasonal variations at Cheeca Rocks (CR), Florida, La Parguera (LP), Puerto Rico, presented based on 8 10 years of continuous, high‐quality...
Abstract New friction factor estimates are computed from the total momentum transfer applied to a rippled sediment bed. The time‐dependent flux is achieved by implementing double‐averaged horizontal equation on nearbed flow field collected with PIV. Time‐independent factors obtained regressing common quadratic stress law given . resulting compare favorably available analysis techniques including energy dissipation, vertical turbulence intensity, and maximum shear stress, but can be 2‐6 times...
Coherent sub-mesoscale features such as spiral eddies are known to be ubiquitous in the world's oceans. Yet, due their complex geometry, they often difficult characterize. Sub-mesoscale ocean dynamics with characteristic dimensions on order of kilometers have been found play a major role upper stirring and mixing. Manifestations these structures all around Caribbean Coastal Ocean Observing System (CariCOOS) region influence coastal oceanic waters impacting hydrodynamics biogeochemistry....
The two-phase flow model SedFOAM was implemented along with an advection-diffusion solver to further understand temporal and spatial variability of scalar fluxes near a permeable rippled bed their response turbulent oscillatory conditions, sediment transport, ripple migration. Numerical experiments were performed scalars introduced by constant point sources at four different along-ripple locations. A time-dependent analysis centroid location, spread, area the plumes revealed distinct...
Direct numerical simulations of oscillatory flow over a bed made ripples have been performed. Two forcing mechanisms compared: (i) sinusoidal external pressure gradient (pressure-driven flow); and (ii) velocity boundary conditions on the rippled (shear-driven flow). In second case, oscillations are such that when observed from reference frame fixed with bed, free stream follows same harmonic oscillation as in pressure-driven case. While outer layers dynamics two cases, close to differences...
Eularian and lagrangian observations collected through the Caribbean Coastal Ocean Observing System (CARICOOS) satellite imagery suggest that interaction between mesoscale eddies (MSEs) littoral waters may be significant in southern coast of Puerto Rico (northern Sea), where insular shelf is narrow (O[10 km]); tidal ranges are low (<;0.5 m), high swells almost inexistent; nearshore bathymetry complex; MSE activity high. A recent expansion CARICOOS HF Radar network allows for unprecedented...