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Bibliographies thématiques / Dual Time Stepping

Littérature scientifique sur le sujet « Dual Time Stepping »

Auteur : Grafiati

Publié le 10 mars 2023

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Articles de revues sur le sujet "Dual Time Stepping"

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Nordström, Jan, et Andrea A. Ruggiu. « Dual Time-Stepping Using Second Derivatives ». Journal of Scientific Computing 81, n^o 2 (9 septembre 2019) : 1050–71. http://dx.doi.org/10.1007/s10915-019-01047-5.

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Abstract We present a modified formulation of the dual time-stepping technique which makes use of two derivatives in pseudo-time. This new technique retains and improves the convergence properties to the stationary solution. When compared with the conventional dual time-stepping, the method with two derivatives reduces the stiffness of the problem and requires fewer iterations for full convergence to steady-state. In the current formulation, these positive effects require that an approximation of the square root of the spatial operator is available and inexpensive.

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Elmahi, I., O. Gloth, D. Hänel et R. Vilsmeier. « A preconditioned dual time-stepping method for combustion problems ». International Journal of Computational Fluid Dynamics 22, n^o 3 (mars 2008) : 169–81. http://dx.doi.org/10.1080/10618560701833333.

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Parent, Bernard. « Positivity-preserving dual time stepping schemes for gas dynamics ». Journal of Computational Physics 361 (mai 2018) : 391–411. http://dx.doi.org/10.1016/j.jcp.2018.01.046.

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Wright, Rachel L., Afia Masood, Elinor S. MacCormac, David Pratt, Catherine M. Sackley et Alan M. Wing. « Metronome-Cued Stepping in Place after Hemiparetic Stroke : Comparison of a One- and Two-Tone Beat ». ISRN Rehabilitation 2013 (17 novembre 2013) : 1–5. http://dx.doi.org/10.1155/2013/157410.

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Hemiparetic gait is characterised by temporal asymmetry and variability, and these variables are improved by auditory cueing. Stepping in place incorporates aspects of gait and may be a useful tool for locomotor training. The aim of this pilot study was to investigate the use of a single-tone and dual-tone metronome to cue stepping in place after hemiparetic stroke. Eight participants completed an uncued baseline stepping condition and two cued stepping conditions utilising a single-tone and a dual-tone metronome. Step times were determined from force plate data, and asymmetry and variability were calculated for the three conditions. Step time asymmetry was significantly reduced in the single-tone condition compared to baseline, and paretic step time variability was significantly reduced in both cued conditions. The single-tone metronome appeared to be preferred to the dual-tone metronome based on participant feedback. The results of this pilot study suggest that metronome cueing produces similar benefits on stepping in place to previously reported findings in walking. Further research on whether stepping in place to a metronome can be used for locomotor training is needed.

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Stepp, Willi L., et Zeynep Ökten. « Resolving kinesin stepping : one head at a time ». Life Science Alliance 2, n^o 5 (octobre 2019) : e201900456. http://dx.doi.org/10.26508/lsa.201900456.

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Kinesins are well known to power diverse long-range transport processes in virtually all eukaryotic cells. The ATP-dependent processive stepping as well as the regulation of kinesin’ activity have, thus, been the focus of extensive studies over the past decades. It is widely accepted that kinesin motors can self-regulate their activity by suppressing the catalytic activity of the “heads.” The distal random coil at the C terminus, termed “tail domain,” is proposed to mediate this autoinhibition; however, a direct regulatory influence of the tail on the processive stepping of kinesin proved difficult to capture. Here, we simultaneously tracked the two distinct head domains in the kinesin-2 motor using dual-color super resolution microscopy (dcFIONA) and reveal for the first time their individual properties during processive stepping. We show that the autoinhibitory wild-type conformation selectively impacts one head in the heterodimer but not the other. Our results provide insights into the regulated kinesin stepping that had escaped experimental scrutiny so far.

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Kalkote, Nikhil, Ashwani Assam et Vinayak Eswaran. « Towards developing an adaptive time stepping for compressible unsteady flows ». International Journal of Numerical Methods for Heat & ; Fluid Flow 29, n^o 2 (4 février 2019) : 487–503. http://dx.doi.org/10.1108/hff-03-2018-0095.

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Purpose The purpose of this paper is to solve unsteady compressible Navier–Stokes equations without the commonly used dual-time loop. The authors would like to use an adaptive time-stepping (ATS)-based local error control instead of CFL-based time-stepping technique. Also, an all-speed flow algorithm is implemented with simple low dissipation AUSM convective scheme, which can be computed without preconditioning which in general destroys the time accuracy. Design/methodology/approach In transient flow computations, the time-step is generally determined from the CFL condition. In this paper, the authors demonstrate the usefulness of ATS based on local time-stepping previously used extensively in ordinary differential equations (ODE) integration. This method is implemented in an implicit framework to ensure the numerical domain of dependence always contains the physical domain of dependence. Findings In this paper, the authors limit their focus to capture the unsteady physics for three cases: Sod’s shock-tube problem, Stokes’ second problem and a circular cylinder. The use of ATS with local truncation error control enables the solver to use the maximum allowable time-step, for the prescribed tolerance of error. The algorithm is also capable of converging very rapidly to the steady state (if there is any) after the initial transient phase. The authors present here only the first-order time-stepping scheme. An algorithmic comparison is made between the proposed adaptive time-stepping method and the commonly used dual time-stepping approach that indicates the former will be more efficient. Originality/value The original method of ATS based on local error control is used extensively in ODE integration, whereas, this method is not so popular in the computational fluid dynamics (CFD) community. In this paper, the authors investigate its use in the unsteady CFD computations. The authors hope that it would provide CFD researchers with an algorithm based on an adaptive time-stepping approach for unsteady calculations.

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Harada, Nobuko, Shuichi Okada et Shinya Negoro. « Age-Related Differences in Stepping Response When Stepping onto a Known Soft Surface under Dual Task Conditions ». Current Gerontology and Geriatrics Research 2010 (2010) : 1–6. http://dx.doi.org/10.1155/2010/701897.

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The purpose of this study was to investigate whether age-related differences in stepping response influence postural control when stepping onto a known soft surface under dual task conditions. Nine young and eleven older female adults participated. First, they stepped on a flat surface while grasping an empty cup (single task), and then they repeated the task while grasping a cup filled with water (dual task). For the second experiment, they stepped on a soft surface placed in front of them while performing the above tasks. The main result was that %DIP (initiation phase as a percentage of the total stepping task time) was significantly higher for older than for young adults during the dual task on the soft surface. In conclusion, caution due to previous experience may increase attentional demand during dual tasks and lengthen the time required for central nervous processing in order to avoid losing postural stability in older adults, resulting in reductions in step velocity and step length compared to those in young adults.

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de Jouëtte, C., O. Laget, J. M. Le Gouez et H. Viviand. « A dual time stepping method for fluid–structure interaction problems ». Computers & ; Fluids 31, n^o 4-7 (mai 2002) : 509–37. http://dx.doi.org/10.1016/s0045-7930(01)00068-8.

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Shan, Li, Jiangyong Hou, Wenjing Yan et Jie Chen. « Partitioned Time Stepping Method for a Dual-Porosity-Stokes Model ». Journal of Scientific Computing 79, n^o 1 (30 novembre 2018) : 389–413. http://dx.doi.org/10.1007/s10915-018-0879-3.

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Zhang, Chi, Massoud Rezavand et Xiangyu Hu. « Dual-criteria time stepping for weakly compressible smoothed particle hydrodynamics ». Journal of Computational Physics 404 (mars 2020) : 109135. http://dx.doi.org/10.1016/j.jcp.2019.109135.

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Plus de sources

Thèses sur le sujet "Dual Time Stepping"

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Unjum, Md Navid Unjum. « Analyzing the Efficiency of an Implicit Dual Time Stepping Solver for Computational AeroAcoustics ». University of Toledo / OhioLINK, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=toledo1501884344120742.

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Pretty, DG. « The role of the pre-frontal cortex in step initiation and aging related changes ». Thesis, 2019. https://eprints.utas.edu.au/34774/1/Pretty_whole_thesis.pdf.

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Fast voluntary stepping is crucial to reducing fall risk in older adults. Older and younger adults (n = 20, mage = 69.4 years; n =21, mage = 26.9 years respectively) performed stepping tasks on force plates while functional Near Infrared Spectroscopy recorded neural activity in the Pre-Frontal Cortex (PFC). It was hypothesised that the PFC plays a role in step initiation and therefore would have greater activity for a choice step compared to a simple step, and this was supported (p = .041, ηp² = .11). Age differences in stepping under levels of cognitive load (forwards and backwards digit recall dual tasks) and step complexity (simple and choice stepping) were also investigated. Older adults’ step initiation was significantly more slowed by the increased step complexity (p = .022, r = .44). For the backwards digit recall dual task, older adults employed a slower stepping strategy for both step types (p = .007, r = .43). Conversely, young adults maintained fast step initiation for both step types and upregulated PFC activity more for the choice step (p = .003, r = .47). Together these findings suggest that older adults could maintain comparable stepping and PFC involvement up until executive functions were strained through either increased step decision making or higher cognitive load. Future research aiming to improve older adults’ stepping speed to reduce fall risk should target more complex stepping conditions.

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MARCONCINI, MICHELE. « Applicazioni del calcolo non stazionario alle turbomacchine ». Doctoral thesis, 2000. http://hdl.handle.net/2158/593135.

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Chapitres de livres sur le sujet "Dual Time Stepping"

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Rouzaud, Olivier, et Sylvie Plot. « Numerical Simulation of Unsteady Internal Flows using Dual Time Stepping Method ». Dans Computational Fluid Dynamics 2000, 239–44. Berlin, Heidelberg : Springer Berlin Heidelberg, 2001. http://dx.doi.org/10.1007/978-3-642-56535-9_34.

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Housman, Jeffrey A., Michael F. Barad, Cetin C. Kiris et Dochan Kwak. « Space-Time Convergence Analysis of a Dual-Time Stepping Method for Simulating Ignition Overpressure Waves ». Dans Computational Fluid Dynamics 2010, 645–52. Berlin, Heidelberg : Springer Berlin Heidelberg, 2011. http://dx.doi.org/10.1007/978-3-642-17884-9_82.

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Heinrich, Ralf, et Hans Bleecke. « Simulation of Unsteady, Three-Dimensional, Viscous Flows Using a Dual- Time Stepping Method ». Dans Notes on Numerical Fluid Mechanics (NNFM), 173–80. Wiesbaden : Vieweg+Teubner Verlag, 1997. http://dx.doi.org/10.1007/978-3-322-86573-1_22.

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Vigneron, D., G. Deliége et J. A. Essers. « Crank-Nicolson Scheme for Solving Low Mach Number Unsteady Viscous Flows Using an Implicit Preconditioned Dual Time Stepping Technique ». Dans Computational Fluid Dynamics 2006, 285–90. Berlin, Heidelberg : Springer Berlin Heidelberg, 2009. http://dx.doi.org/10.1007/978-3-540-92779-2_43.

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Steijl, R., P. Nayyar, M. A. Woodgate, K. J. Badcock et G. N. Barakos. « Application of an implicit dual-time stepping multi-block solver to 3D unsteady flows ». Dans Parallel Computational Fluid Dynamics 2005, 309–16. Elsevier, 2006. http://dx.doi.org/10.1016/b978-044452206-1/50037-9.

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Chollatáin, Regina Uí. « The Irish-Language Press : ‘A Tender Plant at the Best of Times’ ? » Dans The Edinburgh History of the British and Irish Press, Volume 2, 357–76. Edinburgh University Press, 2020. http://dx.doi.org/10.3366/edinburgh/9781474424882.003.0024.

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This chapter focuses on press and periodical press spaces as significant vehicles for Irish language and culture. Such development took place in spaces that juxtaposed Irish- and English-language usage within confined societal structures. The Gaelic column in English language newspapers from the 1850s onwards developed into a forum for the Irish Ireland movement. Much early nineteenth century Irish-language print material was linked to religious organisations; it is not until the latter half of the nineteenth century that Irish emerges in public discourse forums. A notable feature from the 1880s onwards is the use of journals such as the Irish Ecclesiastical Record and the Gaelic Journal as stepping stones for the foundation of the Gaelic League, the main Irish-language Revival organisation. The first dual-language newspaper of the Revival period An Claidheamh Soluis agus Fáinne an Lae (1899-1932), added new dimensions to the political space while maintaining cultural dominance. Irish-language journalism alone was not the cornerstone for Irish-language Revival, but as a cultural element in an evolving new social and intellectual structure, it embraced new writing and communication styles and formats.

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Actes de conférences sur le sujet "Dual Time Stepping"

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Chiew, Jonathan J., et Thomas H. Pulliam. « Stability Analysis of Dual-time Stepping ». Dans 46th AIAA Fluid Dynamics Conference. Reston, Virginia : American Institute of Aeronautics and Astronautics, 2016. http://dx.doi.org/10.2514/6.2016-3963.

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Nordström, Jan, et Andrea Ruggiu. « IMPROVED DUAL TIME–STEPPING USING SECOND DERIVATIVES ». Dans VII European Congress on Computational Methods in Applied Sciences and Engineering. Athens : Institute of Structural Analysis and Antiseismic Research School of Civil Engineering National Technical University of Athens (NTUA) Greece, 2016. http://dx.doi.org/10.7712/100016.2334.5408.

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Venkateswaran, S., et Charles Merkle. « Dual time-stepping and preconditioning for unsteady computations ». Dans 33rd Aerospace Sciences Meeting and Exhibit. Reston, Virigina : American Institute of Aeronautics and Astronautics, 1995. http://dx.doi.org/10.2514/6.1995-78.

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Park, S., Y. Kim et J. Kwon. « Prediction of dynamic damping coefficients using unsteady dual-time stepping method ». Dans 40th AIAA Aerospace Sciences Meeting & Exhibit. Reston, Virigina : American Institute of Aeronautics and Astronautics, 2002. http://dx.doi.org/10.2514/6.2002-715.

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Shieh, Chingwei, et Philip Morris. « High-order accurate dual time-stepping algorithm for viscous aeroacoustic simulations ». Dans 4th AIAA/CEAS Aeroacoustics Conference. Reston, Virigina : American Institute of Aeronautics and Astronautics, 1998. http://dx.doi.org/10.2514/6.1998-2361.

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Lin, Herng, et Ching-Chang Chieng. « Computations of compressible synthetic jet flows using multigrid/dual time stepping algorithm ». Dans 17th Applied Aerodynamics Conference. Reston, Virigina : American Institute of Aeronautics and Astronautics, 1999. http://dx.doi.org/10.2514/6.1999-3114.

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Niu, Yang-Yao, Meng-Sing Liou, Yang-Yao Niu et Meng-Sing Liou. « Numerical simulation of dynamic stall using upwind methods with dual time stepping ». Dans 35th Aerospace Sciences Meeting and Exhibit. Reston, Virigina : American Institute of Aeronautics and Astronautics, 1997. http://dx.doi.org/10.2514/6.1997-1000.

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Lin, Wen, et Pratt &. Whitney Rocketdyne. « Application of Dual-Time Stepping and Finite-Volume Scheme in Computational Aeroacoustics ». Dans 12th AIAA/CEAS Aeroacoustics Conference (27th AIAA Aeroacoustics Conference). Reston, Virigina : American Institute of Aeronautics and Astronautics, 2006. http://dx.doi.org/10.2514/6.2006-2472.

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Gerolymos, G. A., D. Senechal et I. Vallet. « Analysis of Dual Time-Stepping with Explicit Subiterations for Advection-Diffusion-Type Equations ». Dans 47th AIAA Aerospace Sciences Meeting including The New Horizons Forum and Aerospace Exposition. Reston, Virigina : American Institute of Aeronautics and Astronautics, 2009. http://dx.doi.org/10.2514/6.2009-1608.

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Zhang, Laiping, et Z. J. Wang. « A Block LU-SGS Implicit Dual Time-Stepping Algorithm for Hybrid Dynamic Meshes ». Dans 33rd AIAA Fluid Dynamics Conference and Exhibit. Reston, Virigina : American Institute of Aeronautics and Astronautics, 2003. http://dx.doi.org/10.2514/6.2003-3886.

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