International Conference on Computational & Experimental Engineering and Sciences最新文献

Raindrops and Turbulence in a Cloud 云中的雨滴和湍流

International Conference on Computational & Experimental Engineering and Sciences Pub Date : 1900-01-01 DOI: 10.32604/icces.2019.05206

R. Govindarajan, S. Ravichandran, J. R. Picardo, Samriddhi Sankar Ray, S. G. Prasath, V. Vasan

{"title":"Raindrops and Turbulence in a Cloud","authors":"R. Govindarajan, S. Ravichandran, J. R. Picardo, Samriddhi Sankar Ray, S. G. Prasath, V. Vasan","doi":"10.32604/icces.2019.05206","DOIUrl":"https://doi.org/10.32604/icces.2019.05206","url":null,"abstract":"A cloud is in turbulent motion. It contains water vapour, aerosol particles and liquid water droplets. Depending on local levels of supersaturation, condensation takes place onto the aerosol particles and tiny droplets are formed. Our studies are aimed at understanding how these droplets grow in a short time, thought to be of the order of ten minutes, from about a micron in size into raindrops, which are of the order of millimeters. An important part of the process is collisions between droplets, some of which results in coalescence. Caustics from a single vortex are shown to be important for enhancing collisions between droplets [1]. We then ask how this process affects cloud turbulence [2], and show that significant amounts of small scale vorticity is produced in cloud turbulence as compared to standard turbulence where there is no phase change. We then discuss [3] how collisions between droplest happen in highly strained regions of the flow which are often not regions of highest droplet clustering due to turbulence. In the first part of the study [1-3] we assume that droplets may be described by the simplest form of the Maxey-Riley equation, including just Stokes drag. We next [4] show that the Basset history force, which is often neglected, can change the dynamics significantly. We show how to compute this force exactly for various time-independent flows, and how to compute it accurately with low memory requirement for a general flow.","PeriodicalId":225648,"journal":{"name":"International Conference on Computational & Experimental Engineering and Sciences","volume":"19 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115360041","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: 0

Buckling Detection Using Carbon Nanotube Reinforced Composite Sensors 碳纳米管增强复合材料传感器的屈曲检测

International Conference on Computational & Experimental Engineering and Sciences Pub Date : 1900-01-01 DOI: 10.32604/icces.2019.05220

Enrique Garc韆-Mac韆s, Luis Rodr韌uez-Tembleque, Felipe Garc韆-S醤chez, Andr閟 S醗z

引用次数: 0

Numerical Analysis on the Thermal Responses of Near-Critical Fluid to Transient Cooling Process 近临界流体瞬态冷却过程热响应的数值分析

International Conference on Computational & Experimental Engineering and Sciences Pub Date : 1900-01-01 DOI: 10.32604/ICCES.2019.05885

Lin Chen, A. Komiya, S. Maruyama

引用次数: 0

Thin Film Formation and Photovoltaic Application of Transition Metal Dichalcogenides By Liquid Exfoliation 液态剥离法制备过渡金属二硫族化合物薄膜及其光伏应用

International Conference on Computational & Experimental Engineering and Sciences Pub Date : 1900-01-01 DOI: 10.32604/icces.2019.04995

Seung Kyo Lee, Dongil Chu, Eun Kyu Kim

引用次数: 0

The Improved Condensation Heat Transfer Models on Homogeneous and Heterogeneous Surfaces 改进的均匀和非均匀表面冷凝传热模型

International Conference on Computational & Experimental Engineering and Sciences Pub Date : 1900-01-01 DOI: 10.32604/ICCES.2019.05222

Jian Xie, C. Liang, Qingting She, Jinliang Xu

引用次数: 0

Characterizing the Ultra-Slow Creep in Concrete Based on the Non-Local Structural Derivative Maxwell Model 基于非局部结构导数麦克斯韦模型的混凝土超慢徐变特性研究

International Conference on Computational & Experimental Engineering and Sciences Pub Date : 1900-01-01 DOI: 10.32604/ICCES.2019.05090

Xianglong Su, Wenxiang Xu, W. Chen

{"title":"Characterizing the Ultra-Slow Creep in Concrete Based on the Non-Local Structural Derivative Maxwell Model","authors":"Xianglong Su, Wenxiang Xu, W. Chen","doi":"10.32604/ICCES.2019.05090","DOIUrl":"https://doi.org/10.32604/ICCES.2019.05090","url":null,"abstract":"Creep of concrete can last for decades, which displays the ultra-slow rheological phenomena. As an empirical formula, the logarithmic law is usually used to describe the ultra-slow creep. However, the logarithmic law does not always work well especially for the long-term creep. And its corresponding relaxation response cannot be obtained analytically. It is known that the Mittag-Leffler and the inverse Mittag-Leffler functions are generalized from the exponential and the logarithmic functions, respectively. And the inverse Mittag-Leffler function is much slower and generalized than the logarithmic function. In this paper, we use the non-local structural derivative to establish a new Maxwell-type viscoelastic model, in which the inverse Mittag-Leffler function is employed as the structural function to capture the ultra-slow rheology. The viscoelastic responses of the generalized Maxwell model are analytically derived, including creep and relaxation. Moreover, the proposed model is tested by three long-term creep experimental data of concrete. Compared with the standard linear solid model, the Lomnitz logarithmic creep model and the fractional Maxwell model, the proposed generalized Maxwell model agrees better with the experimental data. Numerical results indicate that the non-local structural derivative involving the inverse Mittag-Leffler function is feasible to capture the ultra-slow creep in concrete.","PeriodicalId":225648,"journal":{"name":"International Conference on Computational & Experimental Engineering and Sciences","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125344473","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: 0

A Paris Law-Based Cohesive Zone Model for Fatigue Crack Growth Simulations 基于Paris法的疲劳裂纹扩展黏聚区模型

International Conference on Computational & Experimental Engineering and Sciences Pub Date : 1900-01-01 DOI: 10.32604/ICCES.2019.05151

A. Takahashi, T. Fujiwara, Y. Shintaku

{"title":"A Paris Law-Based Cohesive Zone Model for Fatigue Crack Growth Simulations","authors":"A. Takahashi, T. Fujiwara, Y. Shintaku","doi":"10.32604/ICCES.2019.05151","DOIUrl":"https://doi.org/10.32604/ICCES.2019.05151","url":null,"abstract":": This paper presents a Paris law-based cohesive zone model (CZM) for fatigue crack growth simulations to enable the consideration of the plasticity induced crack closure effect, which is known to be a source of substantial crack growth retardation. In order to avoid the addition of any redundant model parameters, the basic equation of the CZM is derived from the Paris law so that the CZM has only the parameters of Paris law. Thus, the parameters can be determined by referring the existing experimental data of the Paris law without any troublesome fitting processes. Only the parameter to be fitted is the penalty coefficient of the CZM. It can be optimized by fitting the stress intensity factors calculated by the proposed CZM and the conventional finite element method (FEM). Using the penalty coefficient, fatigue crack growth simulations are performed, and the crack growth behavior is compared to that calculated by the FEM-based method. The results are in quantitatively good agreement with those of the FEM-based analysis. Finally, elastic-plastic simulations using the proposed CZM are performed, and the retardation of crack growth by plasticity induced crack closure effect can be observed.","PeriodicalId":225648,"journal":{"name":"International Conference on Computational & Experimental Engineering and Sciences","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115534212","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: 0

Radiation Response of Nanotwinned Cu and the Stability of Stacking Fault Tetrahedron Under Shear 剪切作用下纳米孪晶Cu的辐射响应及层错四面体的稳定性

International Conference on Computational & Experimental Engineering and Sciences Pub Date : 1900-01-01 DOI: 10.32604/ICCES.2019.05016

Lianping Wu, Wenshan Yu, Shuling Hu, S. Shen

引用次数: 0

Analysis on the Thermal Performance of Nanofluids As Working Fluid With Porous Heat Sinks: Applications in Electronics Cooling 纳米流体作为多孔散热器工作流体的热性能分析:在电子冷却中的应用

International Conference on Computational & Experimental Engineering and Sciences Pub Date : 1900-01-01 DOI: 10.32604/ICCES.2019.05145

Z. Saghir, C. Delisle, C. Welsford

引用次数: 0

Adaptive Modelling for Multiphase Flow Through Debris Bed With Boiling 沸点岩屑床多相流的自适应建模

International Conference on Computational & Experimental Engineering and Sciences Pub Date : 1900-01-01 DOI: 10.32604/icces.2019.05077

Liang Yang, A. Buchan, Alan G. Jones, Paul S. Smith, M. Sakai, C. Pain

{"title":"Adaptive Modelling for Multiphase Flow Through Debris Bed With Boiling","authors":"Liang Yang, A. Buchan, Alan G. Jones, Paul S. Smith, M. Sakai, C. Pain","doi":"10.32604/icces.2019.05077","DOIUrl":"https://doi.org/10.32604/icces.2019.05077","url":null,"abstract":": In the event of a severe accident, a large part of the core may collapse and form a debris bed. Debris bed coolability is important to avoid releasing the radioactive materials to the environment. If it is not rapidly cooled, the debris bed will begin to melt and become harder to cool. To stop or slow down the accident evolution, the main approach is to inject water into the reactor core. However, the success of the cooling is not guaranteed depending on the debris bed and the operating condition. This procedure is challenging to understand and model, as it involves the complex multiphase flow, heat transfer, and sometimes, boiling. Establishing a mathematical model and obtaining its numerical solution is not a trivial task. This work aims to offer an efficient computational framework to solve these complex multi- physics phenomena. We present a three-dimensional multi-fluid macroscopic model for the numerical simulation of multiphase flow through debris bed with phase change. Each phase (liquid water, vapour, and debris bed) is modelled separately, and has its own characteristics, density, velocity, etc. Phases are coupled via the parametrisation equation and the phase change between liquid water and vapour is achieved via Stefan condition. The NBS/NRC steam table is integrated in the code, which provides saturation temperature, density, thermal capacity, etc. The spatial distribution of different phases is modelled using the volume fraction representation. The resulting computer routines is implemented in the adaptive multiphase framework FLUIDITY. Anisotropic mesh adaptivity have been demonstrated through","PeriodicalId":225648,"journal":{"name":"International Conference on Computational & Experimental Engineering and Sciences","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131387773","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: 0