Mujal -Colilles, A.; Gironella, X.; Cabrera, A.; Sanchez-Arcilla, A. Journal of waterway, port, coastal, and ocean engineering Vol. 143, num. 5, p. 1-8 DOI: 10.1061/(ASCE)WW.1943-5460.0000382 Data de publicació: 2017-09 Article en revista
Twin propellers without a rudder were studied using a physical model with a fixed clearance distance and three different rotating velocities. Experimental results were compared with results from theoretical expressions developed over the past 50 years for the efflux velocity, axial velocity, and maximum bed velocity. It was found that the efflux velocity equations overestimated the experimental results, whereas the computed axial velocities matched the experimental data reasonably well. However, when maximum bed velocity expressions were compared with experimental results, only one method was found to behave better; overestimation resulted if a quadratic superposition of single jets was used.
Modesto, D.; Fernandez, S.; Huerta, A. Journal of waterway, port, coastal, and ocean engineering Vol. 142, num. 5, p. 04016008-1-04016008-14 DOI: 10.1061/(ASCE)WW.1943-5460.0000336 Data de publicació: 2016-09 Article en revista
Standard strategies for dealing with the Sommerfeld condition in elliptic mild-slope models require strong assumptions on the wave field in the region exterior to the computational domain. More precisely, constant bathymetry along (and beyond) the open boundary, and parabolic approximations–based boundary conditions are usually imposed. Generally, these restrictions require large computational domains, implying higher costs for the numerical solver. An alternative method for coastal/harbor applications is proposed here. This approach is based on a perfectly matched layer (PML) that incorporates the effects of the exterior bathymetry. The model only requires constant exterior depth in the alongshore direction, a common approach used for idealizing the exterior bathymetry in elliptic models. In opposition to standard open boundary conditions for mild-slope models, the features of the proposed PML approach include (1) completely noncollinear coastlines, (2) better representation of the real unbounded domain using two different lateral sections to define the exterior bathymetry, and (3) the generation of reliable solutions for any incoming wave direction in a small computational domain. Numerical results of synthetic tests demonstrate that solutions are not significantly perturbed when open boundaries are placed close to the area of interest. In more complex problems, this provides important performance improvements in computational time, as shown for a real application of harbor agitation.
German, A.; Garcia, J.; Espino, M.; Maidana, M. Journal of waterway, port, coastal, and ocean engineering Vol. 138, num. 1, p. 22-29 DOI: 10.1061/(ASCE)WW.1943-5460.0000105 Data de publicació: 2011-05-26 Article en revista
Caceres, I.; Grifoll, M.; González-Marco, D.; Sanchez-Arcilla, A.; Espino, M. Journal of waterway, port, coastal, and ocean engineering Vol. 134, num. 5, p. 275-285 DOI: 10.1061/(ASCE)0733-950X(2008)134:5(275) Data de publicació: 2008-09 Article en revista
In this paper the relevance of different driving terms that contribute to the winter circulation in the Barcelona Harbor are analyzed. Data from a field campaign are analyzed in order to characterize the most relevant hydrodynamic events. This field campaign covers wind, waves, currents, and water quality parameters under winter conditions (Nov-Dec 2003). These events are related to the velocity response at a control point inside the harbor. Characteristic scenarios are simulated through numerical modeling in order to obtain the corresponding velocity field in the studied domain. The characteristic measured events and the numerical results are compared for velocity and show reasonable agreement under similar conditions. According to these results, the wind- and wave-driven circulations seem to control winter circulation in the Barcelona Harbor. The results obtained increase the knowledge of harbor hydrodynacmics and could be used as a tool to solve certain water quality problems in the Barcelona Harbor.
Espino, M.; Maidana, M.; Sanchez-Arcilla, A.; German, A. Journal of waterway, port, coastal, and ocean engineering Vol. 133, num. 5, p. 313-323 DOI: 10.1061/(ASCE)0733-950X(2007)133:5(313) Data de publicació: 2007-09 Article en revista
The scope of the present work is the hydrodynamic study of the Huelva estuary inside an environmental impact project of a possible breaching of a mining sludge waste pond. This study is based on the numerical simulation of the mean river discharge and the tidal effect. The hydrodynamic models were validated against field measurements corresponding to the period in which the experimental data were registered. The measurements in the estuary primarily indicate that the currents oscillate according to the tidal variation along the river and these show that the currents evolve constantly with the tide so that the upstream speed increases until the end of the period of the tide's rising and it subsequently diminishes until a change of direction at the end of the high tide. The speed of the downstream current increases rapidly during the period of maximum descent of the tide and it decreases again until a change of direction at the end of the low tide. Observations and numerical outputs showed an asymmetric trend in the temporal evolution of the speed of the current, reaching the maximum downstream speed approximately 2-3 h later than the high tide, while the maximum upstream speed was produced around 3-4 It later than of the low tide. The downstream current remains lower than the upstream current for the period of time studied and hence results in an upstream current that favors the retention of the hypothetical quantity of water that may be poured into the creek as a result of the rupture of the waste pond.