Browsing by Issue Date, starting with "2019-04-14"
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- Report on the Second International Workshop on Narrative Extraction from Texts (Text2Story 2019)Publication . Jorge, Alípio Mário Guedes; Campos, Ricardo; Jatowt, Adam; Bhatia, Sumit; Pasquali, Arian; Cordeiro, João; Rocha, Conceição; Mangaravite, VítorThe Second International Workshop on Narrative Extraction from Texts (Text2Story’19 [http://text2story19.inesctec.pt/]) was held on the 14th of April 2019, in conjunction with the 41st European Conference on Information Retrieval (ECIR 2019) in Cologne, Germany. The workshop provided a platform for researchers in IR, NLP, and design and visualization to come together and share the recent advances in extraction and formal representation of narratives. The workshop consisted of two invited talks, ten research paper presentations, and a poster and demo session. The proceedings of the workshop are available online at http://ceur-ws.org/Vol-2342/
- Experimental and numerical study of single droplets impinging upon liquid filmsPublication . Vasconcelos, Daniel; Ribeiro, Daniela; Barata, Jorge M M; Silva, AndréThe phenomenon of liquid drop impact onto liquid surfaces appears in a wide variety of engineering areas such as ink-jet printers, internal combustion engines, spray cooling, etc. The research of this study has been motivated by a need for better predictive capability in these industries. Many authors defined different outcomes regarding this phenomenon. Rioboo et al. [1] revealed more than six possible outcomes, which include deposition, stick, crown splash, prompt splash, among others. These different outcomes may vary depending on many factors such as the liquid drop parameters (diameter, impact velocity, viscosity, surface tension, etc.), the liquid film parameters (thickness, characteristics of the underlying surface, etc.) and the surrounding gas (velocity, pressure, etc.).
- Numerical and experimental study of a plunging airfoilPublication . Lopes, Rodolfo; Camacho, E. A. R.; Neves, Fernando M. S. P.; Silva, André; Barata, Jorge M MCurrently existing air vehicles, although efficient in the cruise conditions, lose much of their performance in maneuvers and phases of the flight such as takeoff, landing, turn or climbing. On the other hand, the flight performed by some animals in Nature demonstrates an ideal adaptation and high efficiency for each flight phase. The production of lift and thrust is performed by the same structures, the wings. On the contrary, in nowadays vehicles, there is a separation of the lift force, produced by the wings, and thrust, produced by engines.
- Cubic and multiparameter equations of state evaluation for supercritical flow modelingPublication . Magalhães, Leandro; Antunes, Eduardo Luís Santos Farias; Silva, André; Barata, Jorge M MThe dawn of space exploration privatizing contributed to a boost and renewed interest in the modeling of vehicles used for such missions. However, the increase of temperature and pressure in combustion chambers, while enhancing fuel injection efficiency, makes fuel and oxidizer exceed their critical point entering a supercritical state. While cubic equations of state such as the Soave-Redlich-Kwong and Peng-Robinson are widely utilized due to their relative simplicity, recent formulations of multiparameter equations for transport properties based on the Helmholtz reduced energy are proving to be an alternative worth considering. The higher accuracy and improved performance of these equations in the critical region is a time-consuming enterprise, relying on large and accurate data sets. Therefore, this work aims at evaluating the influence of cubic and multiparameter transport equations of state in the numerical evolution of density and temperature inside a cryogenic liquid rocket combustion chamber at supercritical conditions.