Computing Systems in Engineering最新文献_第10页

Superconducting axisymmetric finite elements based on a gauged potential variational principle—I. Formulation 基于量变分原理的超导轴对称有限元——ⅰ。配方

Computing Systems in Engineering Pub Date : 1994-06-01 DOI: 10.1016/0956-0521(94)90001-9

J. Schuler, C. Felippa

引用次数: 5

Solving large scale problems in mechanics: Edited by Marolis Papadrakakis, John Wiley & Sons, ISBN 0 471 93809 2 解决力学中的大规模问题:由Marolis Papadrakakis编辑，John Wiley & Sons, ISBN 0 471 93809 2

Computing Systems in Engineering Pub Date : 1994-06-01 DOI: 10.1016/0956-0521(94)90009-4

J. L. Meek

引用次数: 0

Virtual reality in engineering 工程中的虚拟现实

Computing Systems in Engineering Pub Date : 1994-06-01 DOI: 10.1016/0956-0521(94)90010-8

J.E.L. Simmons

引用次数: 1

Numerical implementation and solution strategies for a thermo-elastoplastic-viscoplastic model for cohesive soils 粘性土热弹塑性粘塑性模型的数值实现与求解策略

Computing Systems in Engineering Pub Date : 1994-04-01 DOI: 10.1016/0956-0521(94)90051-5

Victor N. Kaliakin

{"title":"Numerical implementation and solution strategies for a thermo-elastoplastic-viscoplastic model for cohesive soils","authors":"Victor N. Kaliakin","doi":"10.1016/0956-0521(94)90051-5","DOIUrl":"10.1016/0956-0521(94)90051-5","url":null,"abstract":"<div><p>Thermal-mechanical analyses of soils are complicated by the porous nature of the material. Macroscopically soils exhibit an anisotropic, inelastic, hardening (and softening), time- and temperature-dependent behavior. To further complicate matters, the thermal properties of soils are not as well known as those for other materials such as metals. Several important problems have recently arisen that necessitate the realistic prediction of thermal-mechanical behavior of soils. The analysis of such problems requires a general but practical methodology that accounts for not only material non-linearities and thermo-mechanical coupling, but also for time-dependent characteristics of soils.</p><p>This objective has been realized by extending a generalized bounding surface model, originally developed for isothermal analyses of saturated cohesive soils, to consider temperature effects. Besides accounting for thermal-mechanical coupling and for the inelastic nature of soils, this model includes time-dependent behavior. This latter aspect appears to be a novel proposition in thermo-mechanical modeling of soils.</p><p>The emphasis of the present paper is on the numerical implementation and solution of the aforementioned model for thermo-mechanical analysis of saturated cohesive soils. It is shown that the consideration of time effects in the analysis introduces no additional complexity into potential algorithms used in the solution of coupled three-field problems.</p></div>","PeriodicalId":100325,"journal":{"name":"Computing Systems in Engineering","volume":"5 2","pages":"Pages 203-214"},"PeriodicalIF":0.0,"publicationDate":"1994-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0956-0521(94)90051-5","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74887804","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 4

Structural optimisation of axisymmetric and prismatic shells and folded plates 轴对称、棱柱壳和折叠板的结构优化

Computing Systems in Engineering Pub Date : 1994-04-01 DOI: 10.1016/0956-0521(94)90049-3

E. Hinton, N.V.R. Rao, M. Özakça

{"title":"Structural optimisation of axisymmetric and prismatic shells and folded plates","authors":"E. Hinton, N.V.R. Rao, M. Özakça","doi":"10.1016/0956-0521(94)90049-3","DOIUrl":"10.1016/0956-0521(94)90049-3","url":null,"abstract":"<div><p>This paper deals with the development and application of reliable, creative and efficient computational tools for the structural optimisation of variable thickness axisymmetric and prismatic shells and folded plates using computer-aided analysis and design procedure. The problem of finding optimal forms and thickness variations for such structures is solved by integrating computer aided geometry modelling tools, automatic mesh generation, structural analysis, sensitivity evaluation and mathematical programming methods. The shape and thickness variation of the structures are defined using parametric cubic splines and the structural analysis is carried out with either finite element or finite strip methods in which Mindlin-Reissner assumptions are adopted. In static situations, the composition of the strain energy is monitored during the optimisation process to obtain insight into the energy distribution for the optimum structures. This allows us to demonstrate that, in the majority of cases, the optimum shells are membrane energy dominated as might be expected. For the vibrating structures, the mode shapes of the initial and optimum solutions are presented. A set of carefully defined, unambiguous benchmark examples is presented and studied with independent verification to test the various features of the structural optimisation process.</p></div>","PeriodicalId":100325,"journal":{"name":"Computing Systems in Engineering","volume":"5 2","pages":"Pages 179-191"},"PeriodicalIF":0.0,"publicationDate":"1994-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0956-0521(94)90049-3","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77410177","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 4

Modeling temperature and species fluctuations in turbulent, reacting flow 模拟湍流反应流中的温度和物质波动

Computing Systems in Engineering Pub Date : 1994-04-01 DOI: 10.1016/0956-0521(94)90044-2

R.L. Gaffney Jr , J.A. White , S.S. Girimaji , J.P. Drummond

引用次数: 41

Navier-Stokes calculations of multi-dimensional flows with complex chemical kinetics 具有复杂化学动力学的多维流动的Navier-Stokes计算

Computing Systems in Engineering Pub Date : 1994-04-01 DOI: 10.1016/0956-0521(94)90043-4

Harry A. Dwyer

{"title":"Navier-Stokes calculations of multi-dimensional flows with complex chemical kinetics","authors":"Harry A. Dwyer","doi":"10.1016/0956-0521(94)90043-4","DOIUrl":"10.1016/0956-0521(94)90043-4","url":null,"abstract":"<div><p>Multi-dimensional flows have been calculated with complex chemical kinetics for hydrocarbon fuels. The flows include both premixed and diffusion flames, and there is a wide variation of both thermodynamic and chemical reaction conditions. The numerical methods have included an implicit block solver of the ADI type for the transport equations, and the low Mach number limit has been taken for the calculation of the pressure field. The applications consisted of a steady premixed methane flame about a hot sphere, and the time-dependent ignition of a methanol droplet in air. The methane calculation has been compared to a detailed stagnation point calculation, and the results compare favorably. The methanol droplet flow includes the gas, liquid, and interface conditions, and the calculation has been performed under diesel engine thermodynamic conditions. The methane flame was calculated with only temperature change error control and this form of error control was tested first on zero and one-dimensional models with the same chemistry. With this type of error control the time dependent calculation was stable, and steady state was approached rapidly. These calculations of complex chemical kinetics required substantial computer time, but the computational times are not large when compared to the potential of massively parallel computers. The methods used in the paper can be extended to parallel machines in a straight forward manner.</p></div>","PeriodicalId":100325,"journal":{"name":"Computing Systems in Engineering","volume":"5 2","pages":"Pages 105-116"},"PeriodicalIF":0.0,"publicationDate":"1994-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0956-0521(94)90043-4","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87355894","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 8

Solid-to-shell transition elements for the computation of interlaminar stresses 层间应力计算的固壳过渡单元

Computing Systems in Engineering Pub Date : 1994-04-01 DOI: 10.1016/0956-0521(94)90050-7

Carlos G. Dávila

{"title":"Solid-to-shell transition elements for the computation of interlaminar stresses","authors":"Carlos G. Dávila","doi":"10.1016/0956-0521(94)90050-7","DOIUrl":"10.1016/0956-0521(94)90050-7","url":null,"abstract":"<div><p>This paper presents an accurate and practical technique for coupling shell element models to three-dimensional continuum finite element models. The compatibility between these two types of formulations is enforced by degenerating a continuum element through kinematic constraints compatible with shell deformations. Two formulations of two-dimensional/three-dimensional transition elements are presented. The first and simplest formulation is based on the Mindlin-Reissner plate assumptions, and is found to perform well in a variety of problems involving the analysis of geometrically linear/non-linear laminated structures. The second formulation is based on a higher-order shell theory that allows stretching in the through-the-thickness direction. This additional freedom virtually eliminates the interlaminar normal stress boundary layer that can form in lower-order transition elements. Finally, the coupling of two-dimensional to three-dimensional subdomains is enriched with the use of an <em>interface element</em>, which can be used in conjunction with either transition formulation. The interface element improves the efficiency of the solid-to-shell transition modeling scheme by allowing the independent selection of optimal mesh sizes in the shell and the three-dimensional regions of the model.</p></div>","PeriodicalId":100325,"journal":{"name":"Computing Systems in Engineering","volume":"5 2","pages":"Pages 193-202"},"PeriodicalIF":0.0,"publicationDate":"1994-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0956-0521(94)90050-7","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82393269","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 47

Models for high-intensity turbulent combustion 高强度湍流燃烧模型

Computing Systems in Engineering Pub Date : 1994-04-01 DOI: 10.1016/0956-0521(94)90045-0

Sanjay M. Correa

{"title":"Models for high-intensity turbulent combustion","authors":"Sanjay M. Correa","doi":"10.1016/0956-0521(94)90045-0","DOIUrl":"10.1016/0956-0521(94)90045-0","url":null,"abstract":"<div><p>Since direct numerical simulation of the Navier-Stokes plus combustion chemistry equations will not be practical in the foreseeable future, <em>models</em> are required for the parameter range of practical interest, i.e. high Reynolds Numbers and a wide range of Damkohler Numbers. Models based on the notion of a flamelet are not appropriate when the turbulence intensity is much greater than the laminar flame speed, but a stochastic model based on the joint PDF of velocity and composition is promising. If the velocity field and inhomogeneities in physical space are ignored in the joint PDF equation, the “Partially Stirred Reactor” or PaSR model is obtained. The PaSR model has recently been studied in detail. Full chemical schemes are computationally tractable. Because the composition PDF has a large number of dimensions (e.g. <em>N</em><sub>s</sub> > 20 for methane), finite-element/volume techniques are not viable, but particle-tracking Monte-Carlo algorithms work well. An enabling feature of the PaSR is that, with the IEM scalar mixing sub-model, it is well suited to parallel computers. The PaSR can describe the effect of turbulence (coupled to a full kinetic scheme) on combustion, including the behavior of emissions such as NO<sub><em>x</em></sub> and CO, of minor species such as free radicals, and the ignition-extinction bifurcation.</p></div>","PeriodicalId":100325,"journal":{"name":"Computing Systems in Engineering","volume":"5 2","pages":"Pages 135-145"},"PeriodicalIF":0.0,"publicationDate":"1994-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0956-0521(94)90045-0","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88615962","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 7

Geometric uncertainties in finite element analysis 有限元分析中的几何不确定性

Computing Systems in Engineering Pub Date : 1994-04-01 DOI: 10.1016/0956-0521(94)90047-7

S. Chinchalkar , D.L. Taylor

引用次数: 11