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{nogueira_posteriori-implicit_2020,

title = {An a posteriori-implicit turbulent model with automatic dissipation adjustment for Large Eddy Simulation of compressible flows},

author = {Xesús Nogueira-Garea and Luis Ramírez-Palacios and Javier Fernández-Fidalgo and Michael Deligant and Sofiane Khelladi and Jean-Camille Chassaing and Fermín Navarrina-Martínez},

url = {https://www.sciencedirect.com/science/article/pii/S0045793019303147},

doi = {10.1016/j.compfluid.2019.104371},

issn = {0045-7930},

year  = {2020},

date = {2020-01-01},

urldate = {2026-08-06},

journal = {Computers & Fluids},

volume = {197},

pages = {104371},

abstract = {In this work we present an a posteriori high-order finite volume scheme for the computation of compressible turbulent flows. An automatic dissipation adjustment (ADA) method is combined with the a posteriori paradigm, in order to obtain an implicit subgrid scale model and preserve the stability of the numerical method. Thus, the numerical scheme is designed to increase the dissipation in the control volumes where the flow is under-resolved, and to decrease the dissipation in those cells where there is excessive dissipation. This is achieved by adding a multiplicative factor to the dissipative part of the numerical flux. In order to keep the stability of the numerical scheme, the a posteriori approach is used. It allows to increase the dissipation quickly in cells near shocks if required, ensuring the stability of the scheme. Some numerical tests are performed to highlight the accuracy and robustness of the proposed numerical scheme.},

keywords = {A posteriori shock capturing, Compressible flows, Computational fluid dynamics, High-order methods, Implicit large eddy simulation},

pubstate = {published},

tppubtype = {article}

}