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Multi-dimensional Simulation of Phase Change by a 0D-2D Model Coupling via Stefan Condition

Communications on Applied Mathematics and Computation 2023年第2期5卷 853-884页

作者： Adrien Drouillet romain le tellier Raphaël Loubère Mathieu Peybernes Louis Viot Institut de Mathématiques de Bordeaux Universitéde Bordeaux33405 Talence CedexFrance CEA-DES-IRESNE-DTN CEA Cadarache13108 Saint Paul-lez-DuranceFrance

Considering phase changes associated with a high-temperature molten material cooled down from the outside,this work presents an improvement of the modelling and the numerical simulation of such processes for an application pertaining to the safety of light water nuclear *** a core meltdown accident,the behaviour of the core melt(aka corium)into a steel vessel is of tremendous importance when evaluating the vessel *** correctly the heat fluxes requires the numerical simulation of the interaction between the liquid material and its solid counterpart which forms during the solidification process,but also may melt *** simulate this configuration,encoun-tered in various industrial applications,one considers a bi-phase model constituted by a liquid phase in contact and interaction with its solid *** liquid phase may solidify in presence of low energetic source,while the solid phase may melt due to an intense heat flux from the high-temperature *** the frame of the in-house legacy code,several simplifying assumptions(0D multi-layer discretization,instantaneous heat transfer via a quadratic temperature profile in solids)are made for the modelling of such phase *** the present work,these shortcomings are illustrated and further overcome by solving a 2D heat conduction model in the solid by a mixed Raviart-Thomas finite element method coupled to the liquid phase due to heat and mass exchanges through Stefan *** liquid phase is modeled with a 0D multi-layer *** 0D-liquid and 2D-solid mod-els are coupled by a Stefan like phase change interface *** sanity checks are performed to assess the validity of the approach on 1D and 2D academical configurations for which exact or reference solutions are *** more advanced situations(genu-ine multi-dimensional phase changes and an"industrial-like scenario")are simulated to verify the appropriate behavior of the obtained coupled simulation schem

关键词： Simulation of phase change Fusion Solidification 0D multi-layer model 2D heat conduction model Model coupling

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Audio Search for Spoken Documents Content-Based Retrieval

Audio Search for Spoken Documents Content-Based Retrieval

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第八届全国人机语音通讯学术会议

作者： romain le tellier Signal and Image Processing department GET-ENST ParisFrance

The amount of digital audio and video documents being shot and stored in large archives is growing faster than ever before. However, lack of effective content searching methods is a major barrier that prevents people from operating audio and video databases pervasively and intelligently. This paper reviews the state-of-the-art in audio information retrieval and presents an audio searching solution that uses statistical pattern matching techniques. The two-tier speech retrieval solution proposed in this paper, named Audio Search, is composed of a fast searching component followed by an ends-free Viterbi keyword spotter combined with a histogram-based phoneme duration model. Its performances have been evaluated on the 1997 HUB4 database for Chinese broadcast news. In comparison with the results of large vocabulary automatic speech recognition based systems, the results we obtained with the Audio Search system show significant improvements for both long queries (typically 5 to 7 syllables) and out-of-vocabulary (OOV) queries.

关键词： ASR Ends-free Viterbi algorithm

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