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Quadrilateral 2D linked-interpolation finite elements for micropolar continuum

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Acta Mechanica Sinica 2019年第5期35卷 1001-1020页

作者： Sara Grbcic Gordan Jelenic Dragan Ribarc? Faculty of Civil engineering University of RijekaRijekaCroatia universitéde technologie de compiègne Sorbonne UniversitésCompiègneFrance

Quadrilateral finite elements for linear micropolar continuum theory are developed using linked *** order to satisfy convergence criteria,the newly presented finite elements are modified using the Petrov-Galerkin method in which different interpolation is used for the test and trial *** elements are tested through four numerical examples consisting of a set of patch tests,a cantilever beam in pure bending and a stress concentration problem and compared with the analytical solution and quadrilateral micropolar finite elements with standard Lagrangian *** the higher-order patch test,the performance of the first-order element is significantly ***,since the problems analysed are already describable with quadratic polynomials,the enhancement due to linked interpolation for higher-order elements could not be *** the presented elements also faithfully reproduce the micropolar effects in the stress concentration analysis,but the enhancement here is negligible with respect to standard Lagrangian elements,since the higher-order polynomials in this example are not needed.

关键词： Micropolar theory Finite element method Linked interpolation Quadrilateral elements

3D Modeling of sediment movement by ships-generated wakes in confined shipping channel

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International Journal of Sediment Research 2014年第1期29卷 49-58页

作者： Shengcheng JI Abdellatif OUAHSINe Hassan SMAOUI Philippe SeRGeNT université de technologie de compiègne Laboratoire RobervalUMR CNRS 7337Centre de recherche Royallieu université de technologie de compiègne LHN(CETMEF)/Laboratoire Roberval UMR CNRS 7337Centre de recherche Royallieu

Ship-generated waves and return currents are capable of re-suspending significant quantities of bottom and bank ***,most of the previous studies done on the subject do not show how and where sediment is re-suspended by the wakes and the directions of net *** this paper,a 3D numerical model based on hydro-sedimentary coupling is presented to search the relationship between the sediment movement,and the pattern of ship-generated waves around and far away from the vessel and the return currents around the *** hydrodynamic model is based on 3D Navier-Stokes equations including the standard k-ε model for turbulence processes,and the sediment transport model is based on a 3D equation for the re-suspended sediment *** computation results show that the areas of sediment concentration and transport(whether by resuspension or by the bedload) depend mainly on the position,the speed of the ship in the waterways,the kinematics of ship-generated waves and on the return ***,a map of sediment distribution and the modes of sediment transport generated by the passage of the ship are presented.

关键词： Sediment transport Waterway Ship waves CFD

Assessment of ship manoeuvrability by using a coupling between a nonlinear transient manoeuvring model and mathematical programming techniques

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Journal of Hydrodynamics 2013年第5期25卷 788-804页

作者： TRAN KHANH Toan OUAHSINe Abdellatif NACeUR Hakim eL WASSIFI Karima Laboratoire Roberval Université de Technologie de Compiègne Laboratoire LAMIH Université de Valenciennes université Cadi Ayyad Faculté des Sciences et Techniques

In this paper, a numerical method based on a coupling between a mathematical model of nonlinear transient ship manoeuvring motion in the horizontal plane and Mathematical Programming （MP） techniques is proposed. The aim of the proposed procedure is an efficient estimation of optimal ship hydrodynamic parameters in a dynamic model at the early design stage. The proposed procedure has been validated through turning circle and zigzag manoeuvres based on experimental data of sea trials of the 190 000- dwt oil tanker. Comparisons between experimental and computed data show a good agreement of overall tendency in manoeuvring traiectories.

关键词： ship manoeuvrability hydrodynamics coefficients nonlinear transient dynamics sensitivity analysis mathematical pro- gramming

Te Mode Mixing Dynamics in Curved Multimode OpticalWaveguides

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Communications in Computational Physics 2012年第2期11卷 525-540页

作者： emmanuel Perrey-debain I.David Abrahams Laboratoire Roberval Universite de Technologie de Compi`egne 60205 Compi`egne BP 20529France School of Mathematics University of ManchesterOxford RoadManchesterM139PLEnglandU.K.

Propagation of light through curved graded index optical waveguides supporting an arbitrary high number of modes is *** discussion is restricted to optical wave fields which are well confined within the core region and losses through radiation are *** coupled mode theory formalism,two new forms for the propagation kernel for the transverse electric(Te)wave as it travels along a curved two-dimensional waveguide are *** form,involving the notion of“bend”modes,is shown to be attractive from a computational point of view as it allows an efficient numerical evaluation of the optical field for sharply bent waveguides.

关键词： Curved waveguides Coupled Mode Theory harmonic oscillator

Impacts of ship movement on the sediment transport in shipping channel

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Journal of Hydrodynamics 2014年第5期26卷 706-714页

作者： JI Sheng-cheng OUAHSINe Abdellatif SMAOUI Hassan SeRGeNT Philippe JING Guo-qing université de technologie de compiègne.Laboratoire Roberval UMR CNRS 7337Centre de recherché Royallieu BP 2052960206 Compiègne cedexFrance université de technologie de compiègne.Laboratoire Roberval UMR CNRS 7337Centre de recherché Royallieu BP 2052960206 Compiègne cedexFrance CETMEF2Bd GambettaCompiègneFrance CeTMeF 2Bd GambettaCompiègneFrance School of Civil engineering Beijing Jiaotong University

The duration of ship-generated waves （wake waves） and accelerated currents can generate significant influences on the sediment transport. A 3-D numerical model is presented to estimate these effects. The hydrodynamic model is the 3-D Reynolds averaged Navier-Stokes （RANS） equations including the standard k - ε model while the 3-D convection-diffusion model is for the resuspended sediment transport. This hydro-sedimentary model is firstly validated with the trench experimental results, and then applied to the open channel with a moving ship. The computed results demonstrate that the resuspension generation mainly depends on ship speeds, barge number, and the relative distance away from ship. The acceleration effects of ship on the sediment transport are analyzed as well.

关键词： resuspension of sediment shipping channel ship acceleration CFD volume of fluid (VOF) mehtod

Numerical Research of Flow past a Circular Cylinder with Splitter Plate at a Subcritical Reynolds Number Region

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Journal of Shanghai Jiaotong university(Science) 2019年第1期24卷 113-121页

作者： AN Xinyu SONG Baowei TIAN Wenlong MA Congcong School of Marine Science and Technology Northwestern Polytechnical University Laboratoire Roberval Université de Technologie de Compiègne

Numerical research of flow past a circular cylinder with a splitter at the subcritical Reynolds number region of 5 × 10~4—9 × 10~4 was researched based on Computational Fluid Dynamics(CFD) through solving twodimensional incompressible unsteady Reynolds-averaged Navier-Stokes(URANS) equations with the shear stress transport(SST) k-ω turbulence model. Three different grid resolutions were employed in the verification and validation study of the adopted turbulence model. Various fluid characteristics such as Strouhal number, lift coefficient of the cylinder and the splitter with respect to various splitter lengths and different Reynolds numbers were investigated. It was revealed that the lift coefficient ratio of the splitter over the cylinder remains near 1.6 when the splitter length is 1.5—4 times the cylinder's diameter. Vortex shedding is strongly inhibited when the splitter length is greater than a critical value of around four times the cylinder's diameter. The phase difference of the lift coefficient on the upper and lower surface of the splitter varies between-30?and 30?. The maximal lift coefficients are reached when the splitter length is about 2 times the cylinder's diameter. Besides, the splitter length has little influence on the separation angle around the cylinder.

关键词： splitter plate lift force vortex shedding high Reynolds number URANS

Integration of piezoelectric transducers(PZT and PVDF)within polymer-matrix composites for structural health monitoring applications:new success and challenges

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International Journal of Smart and Nano Materials 2020年第4期11卷 343-369页

作者： C.Tuloup W.Harizi Z.Aboura Y.Meyer Roberval(Mechanics Energy and Electricity)Universitéde Technologie de CompiègneCNRSCentre de Recherche RoyallieuCompiègne CedexFrance Savoie SYMME Systems Laboratory Mechatronics and MaterialsUniversitéSavoie Mont-BlancChambéryFrance

This article investigates the interest of using in-situ piezoelectric(PZT and PVDF)disks to perform real-time Structural Health Monitoring(SHM)of glass fiber-reinforced polymer composites submitted to var-ious tensile *** goal is to evaluate the working range and SHM potential of such embedded transducers for relatively simple mechanical loadings,with the long-term aim of using them to monitor complete 3D structures submitted to more complex *** is performed acquiring the electrical capacitance variation of the embedded *** study the potential links between the insitu capacitance signal and the global response of the loaded host specimens,a multi-instrumentation composed of external Nondestructive Testing techniques was implemented on the surfaces of the specimens to search for multi-physical couplings between these external measurements and the capacitance *** confirmed the non-intrusiveness of the embedded transducers,and allowed estimating their working *** capacitance signal follows well the mechanical loadings,but the piezoceramic transducer gets damaged after a determined relatively low strain level due to its *** limits of this working domain are extended by using a stretchable PolyVinylidene Fluoride(PVDF)polymer transducer,allowing this one to perform in-situ and real-time SHM of its host tensile specimens until failure.

关键词： Polymer-matrix composites(PMCs) in-situ piezoelectric transducer structural health monitoring nondestructive testing tensile loading PZT PVDF

3-D NUMeRICAL SIMULATION OF CONVOY-GeNeRATeD WAVeS IN A ReSTRICTeD WATeRWAY

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Journal of Hydrodynamics 2012年第3期24卷 420-429页

作者： OUAHSINe Abdellatif SMAOUI Hassan SeRGeNT Philippe université de technologie de compiègne Laboratoire Roberval UMR CNRS/UTC 7337 Centre de Recherches Royallieu BP 20529 60206 Compiègne cedex France CeTMeF 2boulevard Gambetta BP 60039 60321 Compiègne Cedex France CeTMeF 2 boulevard Gambetta BP 60039 60321 Compiègne Cedex France

We consider waves generated by the passing of convoys in a restricted waterway. The magnitude of these waves depends mainly on the geometrical and kinematical parameters of the convoy, such as the speed and the hull geometry. The objective of this study is to predict the relationship between these geometrical and kinematical parameters and the amplitude of ship-generated waves as well as the water plane drawdown. Numerical simulations are conducted by solving the 3-D Navier-Stokes equations along with the standard k-c model for turbulent processes. The results are compared first with the empirical model and second with experimental measurements performed by the French company Compagnie National du Rhone （CNR）.

关键词： ship-generated waves waterway CFD free surface gravity waves

Field-dependent nonlinear piezoelectricity:a focused review

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International Journal of Smart and Nano Materials 2018年第1期9卷 68-84,I0004页

作者： Ayech Benjeddou ROBeRVAL UMR 7337 UTC/CNRS Universitéde Technologie de Compiègne(UTC)CompiègneFranceInstitut Supérieur de Mécanique de Paris(SUPMECA)Saint OuenFrance

This contribution presents a multidisciplinary review of the so-called field-dependent nonlinear *** starts with an introduction that poses the literature analysis framework,through defining this operational(that is oftenmet in practice)piezoelectric field-dependent ***,the latter is a less known phenomenon although it is inherent to stress-free actuation responses of corresponding smart materials,actuators and ***,related experimental observations from piezoelectric materials,actuator devices and smart structures tests are multidisciplinary surveyed for understanding the underlying mechanisms of the encountered field-dependent ***,empirical material and numerical structural modelling and simulation approaches are critically reviewed from,respectively,the constitutive and finite element analysis points of *** conclusions and few future directions for research are finally provided as a *** is worth mentioning that,although it is concise(retains only experiments and experimentally-correlated models and simulations),this critical review covers the last three decades period which is almost the whole age of the piezoelectric materials,actuators and smart structures research field.

关键词： Stress-free actuation field-dependent nonlinearity piezoelectric materials actuators smart structures experiments,modelling and simulation