15th World Congress on Computational Mechanics (WCCM-XV) and 8th Asian Pacific Congress on Computational Mechanics (APCOM-VIII)最新文献_第10页

Local Peak Pressure on Super High-rise Building in Actual Urban Area 实际城区超高层建筑局部峰值压力分析

15th World Congress on Computational Mechanics (WCCM-XV) and 8th Asian Pacific Congress on Computational Mechanics (APCOM-VIII) Pub Date : 1900-01-01 DOI: 10.23967/wccm-apcom.2022.062

A. Ono, T. Nozu, T. Tamura, H. Kawai

引用次数: 0

Time-dependent modelling of quasi-brittle materials with a strong discontinuity approach 具有强不连续方法的准脆性材料的时间相关建模

15th World Congress on Computational Mechanics (WCCM-XV) and 8th Asian Pacific Congress on Computational Mechanics (APCOM-VIII) Pub Date : 1900-01-01 DOI: 10.23967/wccm-apcom.2022.115

S. Chianeh, D. Dias‐da‐Costa

{"title":"Time-dependent modelling of quasi-brittle materials with a strong discontinuity approach","authors":"S. Chianeh, D. Dias‐da‐Costa","doi":"10.23967/wccm-apcom.2022.115","DOIUrl":"https://doi.org/10.23967/wccm-apcom.2022.115","url":null,"abstract":". The time-dependent behaviour of quasi-brittle materials can have a signiﬁcant effect on ser-viceability and ultimate failure. E.g., in the case of concrete structures, the presence of cracking can evolve, propagate and gradually widen over time, therefore signiﬁcantly changing the stress state and expected structural response. The development of models that can account for the discrete nature of cracking whilst predicting time-dependent behaviour can be of interest to many practical applications. The discrete strong discontinuity approach (DSDA) has been validated as a reliable approach for sim-ulating the cracking phenomenon by directly embedding the traction-separation constitutive relation within ﬁnite elements, therefore enriching standard ﬁnite element models with the ability to capture cracks, where material can separate without the need for remeshing. This work presents a generalisation to account for the long-term behaviour of cracked quasi-brittle materials, more speciﬁcally creep and shrinkage. To this end, a rate-type creep is ﬁrst applied through a number of kelvin units; the interaction of the resulting response from the Kelvin chain system, shrinkage, and discrete cracking is developed to obtain a suitable constitutive model for the discrete crack simulations. Finally, the formulation is deployed on a ﬁnite element code where the performance of the proposed model is assessed through representative numerical examples.","PeriodicalId":429847,"journal":{"name":"15th World Congress on Computational Mechanics (WCCM-XV) and 8th Asian Pacific Congress on Computational Mechanics (APCOM-VIII)","volume":"68 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":"126100681","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

Bayesian Optimization on Fifth-Order Targeted ENO Scheme for Compressible Flows 可压缩流五阶目标ENO方案的贝叶斯优化

15th World Congress on Computational Mechanics (WCCM-XV) and 8th Asian Pacific Congress on Computational Mechanics (APCOM-VIII) Pub Date : 1900-01-01 DOI: 10.23967/wccm-apcom.2022.024

Y. Feng, F. Schranner, J. Winter, N. Adams

{"title":"Bayesian Optimization on Fifth-Order Targeted ENO Scheme for Compressible Flows","authors":"Y. Feng, F. Schranner, J. Winter, N. Adams","doi":"10.23967/wccm-apcom.2022.024","DOIUrl":"https://doi.org/10.23967/wccm-apcom.2022.024","url":null,"abstract":". Targeted ENO (TENO) has been proposed to overcome the shortcomings of WENO schemes, namely excessive dissipation of lower-order upwind-biased and degenerated schemes, and limited robustness of central-biased schemes. TENO offers a set of free parameters to shape the inherent effective local dissipation and dispersion. In the original formulation of TENO, these free parameters have been adjusting by means of the approximate dissipation-dispersion relation. Hence, the TENO formulation may be superior in this aspect, yet, it does not necessarily outperform other schemes in ﬂows involving non-linear interaction of a broad range of scales. Data-driven methods enable optimizing these free parameters instead of adjusting them. In this work, we demonstrate the application of an iterative Bayesian optimization approach on designing ﬁfth-order TENO (TENO5) schemes. Exploiting that Bayesian optimization efﬁciently and robustly ﬁnds an optimum of an expensive function with a low number of trials, we construct speciﬁc TENO5-schemes for compressible ﬂows with gas dynamic discontinuities as well as for implicit large eddy simulation (ILES). For the former, we measure the error between under-resolved simulations of the Sod shock tube and its analytical solution for automatically generated TENO5 formulations as the objective. For the latter, under-resolved inviscid Taylor-Green vortex ﬂows are evolved to their turbulent state, in which their kinetic energy spectrum in the inertial subrange is compared to the theoretical Kolmogorov-scaling solution to formulate its objective. We show that these two TENO5 formulations perform superior to the original formulation of TENO5 relevant to the speciﬁc types of ﬂows. Also, a variety of benchmark test ﬂows show that both speciﬁc TENO5 formulations outperform the original one in terms of phase speed, shock-preservation, as well as physical consistency of ﬂuid-dynamic instabilities and turbulent ﬂows.","PeriodicalId":429847,"journal":{"name":"15th World Congress on Computational Mechanics (WCCM-XV) and 8th Asian Pacific Congress on Computational Mechanics (APCOM-VIII)","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":"126171650","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: 1

A New Mixed FE-Formulation for Liquid Crystal Elastomer Films 一种用于液晶弹性体薄膜的新型混合fe配方

15th World Congress on Computational Mechanics (WCCM-XV) and 8th Asian Pacific Congress on Computational Mechanics (APCOM-VIII) Pub Date : 1900-01-01 DOI: 10.23967/wccm-apcom.2022.007

M. Gross, F. Concas, J. Dietzsch

{"title":"A New Mixed FE-Formulation for Liquid Crystal Elastomer Films","authors":"M. Gross, F. Concas, J. Dietzsch","doi":"10.23967/wccm-apcom.2022.007","DOIUrl":"https://doi.org/10.23967/wccm-apcom.2022.007","url":null,"abstract":". Liquid crystal elastomers (LCEs) are soft materials, which are capable of large deforma-tions induced by temperature changes and ultraviolet irradiation [1]. Therefore, since many years, these materials are under investigation in experimental researches as actuator materials. LCEs arise from a nematic polymer melt, consisting of long and ﬂexible polymer chains as well as oriented and rigid rod-like molecules, the so-called mesogens, by crosslinking. After this process, the ﬂow ability and the orientation of the mesogens is retained. To date, the alignment of LCEs is primarily achieved in thin ﬁlms. When the orientational order in the ﬁlm is lost due to temperature changes or ultraviolet irradiation, the LCE ﬁlm is capable of length changes of 400 percent. In order to numerically simulate LCE materials as actuators in multibody system models by using the ﬁnite element method, a continuum formulation is necessary, which include in a thermo-viscoelastic material formulation of the polymer chains the orientation effects of the mesogens. This can be performed by introducing a normalized direction vector as an independent ﬁeld, and deriving from additional (orientational) balance laws independent differential equations [2]. These differential equations describe the independent rotation of the rigid mesogens connected with the ﬂexible polymer chains. The orientation-dependent stress law of LCEs arises from an anisotropic","PeriodicalId":429847,"journal":{"name":"15th World Congress on Computational Mechanics (WCCM-XV) and 8th Asian Pacific Congress on Computational Mechanics (APCOM-VIII)","volume":"51 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":"116728007","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: 1

Reproduction Method of Mechanical Anisotropy Induced by Cold Rolling in Crystal Plasticity FE Simulation 晶体塑性有限元模拟中冷轧诱导力学各向异性的再现方法

15th World Congress on Computational Mechanics (WCCM-XV) and 8th Asian Pacific Congress on Computational Mechanics (APCOM-VIII) Pub Date : 1900-01-01 DOI: 10.23967/wccm-apcom.2022.099

Y. Yaginuma, Y. Aoyagi

引用次数: 0

A Comparison Study between Isogeometric Analysis and Finite Element Analysis for Nonlinear Inelastic Dynamic Problems with Geomiso DNL Software 基于Geomiso DNL软件的非线性非弹性动力问题等几何分析与有限元分析的比较研究

15th World Congress on Computational Mechanics (WCCM-XV) and 8th Asian Pacific Congress on Computational Mechanics (APCOM-VIII) Pub Date : 1900-01-01 DOI: 10.23967/wccm-apcom.2022.001

P. Karakitsios, I. Prentzas, A. Leontaris, A. Papakonstantinou

引用次数: 1

Construction of a surrogate model for crash box corruption 构建碰撞箱损坏的代理模型

15th World Congress on Computational Mechanics (WCCM-XV) and 8th Asian Pacific Congress on Computational Mechanics (APCOM-VIII) Pub Date : 1900-01-01 DOI: 10.23967/wccm-apcom.2022.031

K. Sugiyama, Y. Wada

引用次数: 0

Estimation of the state of matter in young impact craters on the Moon based on the orbital observations 基于轨道观测的月球年轻撞击坑中物质状态的估计

15th World Congress on Computational Mechanics (WCCM-XV) and 8th Asian Pacific Congress on Computational Mechanics (APCOM-VIII) Pub Date : 1900-01-01 DOI: 10.23967/wccm-apcom.2022.047

M. Shpekin, R. Ferreyra

引用次数: 0

Three-Dimensional Super-Resolution of Passive-Scalar and Velocity Distributions Using Neural Networks for Real-Time Prediction of Urban Micrometeorology 基于神经网络的三维超分辨无源标量和速度分布实时预报

15th World Congress on Computational Mechanics (WCCM-XV) and 8th Asian Pacific Congress on Computational Mechanics (APCOM-VIII) Pub Date : 1900-01-01 DOI: 10.23967/wccm-apcom.2022.114

Y. Yasuda, R. Onishi, K. Matsuda

引用次数: 1

Consideration of the Behaviour of a Wind Turbine Wake Using High-Fidelity CFD Simulations 基于高保真CFD模拟的风力机尾流特性研究

15th World Congress on Computational Mechanics (WCCM-XV) and 8th Asian Pacific Congress on Computational Mechanics (APCOM-VIII) Pub Date : 1900-01-01 DOI: 10.23967/wccm-apcom.2022.028

K. Shibuya, T. Uchida, M. Inui, Z. Bai, Y. Taniyama

引用次数: 0