Publicacións

@article{tsoutsanis_short_2023,

title = {A short note on a 3D spectral analysis for turbulent flows on unstructured meshes},

author = {Panagiotis Tsoutsanis and Xesús Nogueira-Garea and Lin Fu},

url = {https://www.sciencedirect.com/science/article/pii/S0021999122008671},

doi = {10.1016/j.jcp.2022.111804},

issn = {0021-9991},

year  = {2023},

date = {2023-02-01},

urldate = {2026-08-13},

journal = {Journal of Computational Physics},

volume = {474},

pages = {111804},

abstract = {We propose two techniques for computing the energy spectra for 3D unstructured meshes that are consistent across different element types. These techniques can be particularly useful when assessing the dissipation characteristics and the suitability of several popular non-linear high-order methods for implicit large-eddy simulations (iLES). Numerical experiments demonstrate the performance of several element types for iLES of the Taylor-Green vortex, where a significantly different dissipation and dispersion mechanism for each element type is revealed. The energy spectra results are dependent on the technique selected for obtaining them, therefore an additional established technique from the literature is also included for comparison to further analyse their similarities and their differences. These techniques can be an integral tool for the tuning and calibration of non-linear high-order methods that can benefit both explicit and implicit large-eddy simulations (LES).},

keywords = {FFT, High-order non-linear methods, Implicit large eddy simulation, Turbulent flow, Unstructured meshes},

pubstate = {published},

tppubtype = {article}

}

@article{pena_conversion_2018,

title = {Conversion of Vertical Slot Fishways to Deep Slot Fishways to Maintain Operation during Low Flows: Implications for Hydrodynamics},

author = {Luis Pena-Mosquera and Jerónimo Puertas-Agudo and María Bermúdez and Luis Cea-Gómez and Enrique Peña-González},

url = {https://www.mdpi.com/2071-1050/10/7/2406},

doi = {10.3390/su10072406},

issn = {2071-1050},

year  = {2018},

date = {2018-07-01},

urldate = {2026-08-04},

journal = {Sustainability},

volume = {10},

number = {7},

pages = {2406},

publisher = {Multidisciplinary Digital Publishing Institute},

abstract = {Deep slot fishways (DSF) are similar to vertical slot fishways (VSF) except that a sill has been placed at the base of the slot, and thus require a lower discharge to operate. The conversion of a VSF to a DSF, which requires minimal design modifications, can make for a more flexible design in inflow management, maintaining the correct operation of the fishway in periods of limited water availability. It is, however, crucial to understand the new flow conditions that will be created inside the fishway, and their implications for fish passage. In this paper, the hydrodynamics of DSF were studied for two different pool configurations and five sill heights. The investigation comprised the analysis of the water surface configuration, the velocity and turbulence fields, as well as the definition of the equations that related discharges to depths in the pools. The DSF designs compared well in terms of water surface patterns and maximum velocities with VSFs, but resulted in a more complex three-dimensional flow pattern and increased turbulence levels. Further testing with fish is needed to analyze whether the benefits of retrofitting a VSF by adding a sill during low flows are cancelled out by increased fish passage difficulty.},

keywords = {fishway, flow patterns, hydraulic models, Turbulent flow, upstream passage, velocity distribution},

pubstate = {published},

tppubtype = {article}

}

@article{Cea2007333,

title = {Velocity measurements on highly turbulent free surface flow using ADV},

author = {Luis Cea-Gómez and Jerónimo Puertas-Agudo and Luis Pena-Mosquera},

url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-33847647556&doi=10.1007%2fs00348-006-0237-3&partnerID=40&md5=a9adb3adcf25fc2b64d61a367be5829e},

doi = {10.1007/s00348-006-0237-3},

issn = {07234864},

year  = {2007},

date = {2007-01-01},

urldate = {2007-01-01},

journal = {Experiments in Fluids},

volume = {42},

number = {3},

pages = {333-348},

abstract = {The 3D instantaneous velocity recorded with an acoustic Doppler velocimeter (ADV) in a highly turbulent free surface flow is analysed using several filters in order to eliminate the corrupted data from the sample. The filters used include the minimum/maximum threshold, the acceleration threshold, and the phase-space threshold. Following some ideas of the phase-space filter, a new method based on the 3D velocity cross-correlation is proposed and tested. A way of computing the constants of the acceleration threshold method is proposed, so no parameters need to be fixed by the user, which makes the filtering process simpler, more objective and more efficient. All the samples analysed are highly turbulent. Nevertheless, the turbulence intensity and the air entrainment vary widely in the flow under study, which produces data records of different quality depending on the measurement point. The performance of the filtering methods when applied to samples of different quality, and the effects of the filtering process in the mean velocity, turbulent kinetic energy and frequency spectra are discussed. © Springer-Verlag 2007.},

note = {cited By 128},

keywords = {Acoustic Doppler velocimeter (ADV); Phase space filter; Surface flow, Data acquisition; Kinetic energy; Turbulent flow; Velocity measurement, Data acquisition; Kinetic energy; Velocity measurement, Turbulent flow},

pubstate = {published},

tppubtype = {article}

}

@article{Cea2007160,

title = {Application of several depth-averaged turbulence models to simulate flow in vertical slot fishways},

author = {Luis Cea-Gómez and Luis Pena-Mosquera and Jerónimo Puertas-Agudo and María Elena Vázquez-Cendón and Enrique Peña-González},

url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-33846405654&doi=10.1061%2f%28ASCE%290733-9429%282007%29133%3a2%28160%29&partnerID=40&md5=a9d56bfdd5e01b7479544734514ce973},

doi = {10.1061/(ASCE)0733-9429(2007)133:2(160)},

issn = {07339429},

year  = {2007},

date = {2007-01-01},

urldate = {2007-01-01},

journal = {Journal of Hydraulic Engineering},

volume = {133},

number = {2},

pages = {160-172},

abstract = {Vertical slot fishways are hydraulic structures which allow the upstream migration of fish through obstructions in rivers. The velocity, water depth, and turbulence fields are of great importance in order to allow the fish swimming through the fishway, and therefore must be considered for design purposes. The aim of this paper is to assess the possibility of using a two-dimensional shallow water model coupled with a suitable turbulence model to compute the flow pattern and turbulence field in vertical slot fishways. Three depth-averaged turbulence models of different complexity are used in the numerical simulations: a mixing length model, a k-ε model, and an algebraic stress model. The numerical results for the velocity, water depth, turbulent kinetic energy, and Reynolds stresses are compared with comprehensive experimental data for three different discharges covering the usual working conditions of vertical slot fishways. The agreement between experimental and numerical data is very satisfactory. The results show the importance of the turbulence model in the numerical simulations, and can be considered as a useful complementary tool for practical design purposes. © 2007 ASCE.},

note = {cited By 68},

keywords = {Algebra; Computer simulation; Fishways; Flow patterns; Hydraulic structures; Stresses; Turbulence, Algebra; Computer simulation; Fishways; Flow patterns; Hydraulic structures; Stresses; Turbulence; Turbulent flow, Algebraic stress model; Reynolds stresses; Shallow water model; Turbulence model, flow pattern; hydraulic structure; Reynolds number; shallow water; simulation; turbulent flow; two-dimensional flow, Turbulent flow},

pubstate = {published},

tppubtype = {article}

}