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A two-phase model for fast geomorphic shallow flows

International Journal of Sediment Research 2012年第4期27卷 409-425页

作者： Massimo GRECO Michele IERVOLINO angelo leopardi Andrea VACCA Dipartimento di Ingegneria Idraulica Geotecnica ed Ambientale-Universita di Napoli “Federico Ⅱ”via Claudio 21-80125 NapoliITALY Prof. Dipartimento di Ingegneria Civile e Meccanica-Universita di Cassino e del Lazio Meridionale via Di Biasio 43-03043 Cassino(FR)ITALY Assis.Prof.Dr. 4. Dipartimento di Ingegneria Civile-Seconda Universita di Napolivia Roma 29-81031 Aversa(CE)ITALY Assoc.Prof.Dr. Dipartimento di Ingegneria Civile-Seconda Universita di Napoli via Roma 29-81031 Aversa(CE)ITALY Assis.Prof.Dr.

The paper introduces a 2D shallow water model based on a two-phase formulation for the analysis of fast geomorphic transients occurring in the context of river *** and momentum conservation principles are separately imposed for both *** model naturally accounts for non-equilibrium solid transport,since neither instantaneous adaptation hypothesis nor any lag equation is employed to represent sediment *** hyperbolic character of the proposed model is shown to be preserved independently on the flow *** from numerical simulations of both 1D and 2D test-cases are compared with literature experimental data and with available numerical solutions.

关键词： Morphodynamic model Non-equilibrium sediment transport Two-phase shallow-water model Eigenvalues analysis Dam-break flows

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Simulation of dam-break waves on movable beds using a multi-stage centered scheme

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International Journal of Sediment Research 2013年第3期28卷 269-284页

作者： Stefania EVANGELISTA Mustafa S.ALTINAKAR Cristiana DI CRISTO angelo leopardi Dipartimento di Ingegneria Civile e Meccanica Universita degli Studi di Cassino e del Lazio Meridionale NCCHE National Center for Computational Hydroscience and EngineeringUniversity of Mississippi

This paper presents the application of the multi-stage first-order centered scheme GMUSTA to solve a two-phase flow model with four equations for simulating dam-break floods without and with sediment *** of generalized Riemann invariants can be particularly complex and costly in simulating dam-break floods with sediment *** numerical scheme,which does not require complete knowledge of the eigenstructure of the hyperbolic mathematical model,offers a suitable and attractive *** quality of the dam-break flood simulations with GMUSTA scheme is verified by comparing the results against laboratory tests and some experimental data available in the literature,on fixed and mobile bed conditions,with different bed materials and flush or stepped *** numerical results reproduce quite well the experimental evidence,proving that the model is capable of predicting the temporal evolution of the free-surface and the *** GMUSTA scheme,which is not only simple to implement but also both accurate and computationally efficient,is proposed as an appropriate tool for integrating non-equilibrium sediment-transport models.

关键词： Dam break Sediment transport Shallow water Multi-stage scheme GMUSTA

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Endoscopy-assisted transoral approach for parapharyngeal space tumors:Our experience and a systematic review of the literature

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World Journal of Otorhinolaryngology-Head and Neck Surgery 2023年第1期9卷 79-90页

作者： Pietro Orlando Luca Giovanni Locatello Oreste Gallo Gianluca leopardi Giandomenico Maggiore Department of Otorhinolaryngology Careggi University HospitalFlorenceItaly Department of Experimental and Clinical Medicine University of FlorenceFlorenceItaly Unit of Otorhinolaryngology Azienda USL Toscana CentroSan Giuseppe HospitalEmpoliItaly

Background:Several approaches have been described for the excision of parapharyngeal space tumors(PPSTs).Advances in endoscopy gave a further stimulus to the use of the transoral ***:We present our experience with the endoscopy-assisted transoral approach(EATA)in this regard and a review of the most recent literature about EATA for PPSTs *** and Methods:We retrospectively analyzed our experience and systematically reviewed the literature about the outcomes of this ***:Seven PPSTs were completely excised,with three of them requiring a combined transcervical *** one case of postoperative wound dehiscence was registered,and the mean length of stay was 3.9 *** histopathological examination confirmed the results obtained with preoperative fine-needle aspiration biopsy in all cases and no recurrences were apparent after a mean follow-up of 28.1 ***:Magnetic resonance imaging,the modified Mallampati score and the 8 Ts criteria are useful instruments for the choice of the most appropriate surgical ***:In light of our experience and following other published series in the literature,we believe that EATA may represent a safe and effective approach for the treatment of the majority of PPSTs.

关键词： endoscope-assisted surgery head and neck surgery mini-invasive approach parapharyngeal space tumors transoral surgery

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