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Large-eddy simulations of turbulent compressible supersonic jet flows using discontinuous Galerkin methods 用不连续伽辽金方法模拟大涡湍流可压缩超音速射流
8th European Congress on Computational Methods in Applied Sciences and Engineering Pub Date : 2023-01-04 DOI: 10.23967/eccomas.2022.162 10.23967/eccomas.2022.162
D. F. Abreu, Carlos Junqueira-Junior, E. T. Dauricio, João Luiz, F. Azevedo
{"title":"Large-eddy simulations of turbulent compressible supersonic jet flows using discontinuous Galerkin methods","authors":"D. F. Abreu, Carlos Junqueira-Junior, E. T. Dauricio, João Luiz, F. Azevedo","doi":"10.23967/eccomas.2022.162 10.23967/eccomas.2022.162","DOIUrl":"https://doi.org/10.23967/eccomas.2022.162 10.23967/eccomas.2022.162","url":null,"abstract":"In this work, a discontinuous Galerkin scheme is employed to perform LES simulations of supersonic jet flows. A total of four simulations are performed with different meshes and order of accuracy. The number of degrees of freedom from the simulations varies from 50 x 106 to 400 x 106. The results indicate that by increasing the resolution of simulation, in general, the results got closer to experimental data. The jet lipline is the only region in which this behavior is not observed. It investigated a procedure of using lower-order simulations to initialize high-order simulations and consequently reduce the total time of the simulation using high-order schemes. This strategy is successful and allows to perform high-order simulations with only 5% more computational effort than a complete second-order simulation.","PeriodicalId":384863,"journal":{"name":"8th European Congress on Computational Methods in Applied Sciences and Engineering","volume":"9 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-01-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123667919","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
Probabilistic modeling of LCF failure times using a epidemiological crack percolation model 基于流行病学裂纹渗透模型的LCF失效时间概率建模
8th European Congress on Computational Methods in Applied Sciences and Engineering Pub Date : 2022-07-06 DOI: 10.23967/eccomas.2022.225
M. Harder, P. Lion, L. Made, T. Beck, H. Gottschalk
{"title":"Probabilistic modeling of LCF failure times using a epidemiological crack percolation model","authors":"M. Harder, P. Lion, L. Made, T. Beck, H. Gottschalk","doi":"10.23967/eccomas.2022.225","DOIUrl":"https://doi.org/10.23967/eccomas.2022.225","url":null,"abstract":"The analysis of standardized low cycle fatigue (LCF) experiments shows that the failure times widely scatter. Furthermore, mechanical components often fail before the deterministic failure time is reached. A possibility to overcome these problems is to consider probabilistic failure times. Our approach for probabilistic life prediction is based on the microstructure of the metal. Since we focus on nickel-base alloys we consider a coarse grained microstructure, with random oriented FCC grains. This leads to random distributed Schmid factors and different anisotropic stress in each grain. To gain crack initiation times, we use Coffin-Manson- Basquin and Ramberg-Osgood equation on stresses corrected with probabilistic Schmid factors. Using these single grain crack initiation times, we have developed an epidemiological crack growth model over multiple grains. In this mesoscopic crack percolation model, cracked grains induce a stress increase in neighboring grains. This stress increase is realized using a machine learning model trained on data generated from finite element simulations. The resulting crack clusters are evaluated with a failure criterion based on a multimodal stress intensity factor. From the generated failure times, we calculate surface dependent hazard rates using a Monte Carlo framework. We compare the obtained failure time distributions to data from LCF experiments and find good coincidence of predicted and measured scatter bands.","PeriodicalId":384863,"journal":{"name":"8th European Congress on Computational Methods in Applied Sciences and Engineering","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-07-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129284109","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
Development lengths for non-newtonian flows in pipes and tubes based on the wall shear stress 基于管壁剪切应力的非牛顿管道流动发展长度
8th European Congress on Computational Methods in Applied Sciences and Engineering Pub Date : 1900-01-01 DOI: 10.23967/eccomas.2022.085
C. Lambride, A. Syrakos, G. Georgiou
{"title":"Development lengths for non-newtonian flows in pipes and tubes based on the wall shear stress","authors":"C. Lambride, A. Syrakos, G. Georgiou","doi":"10.23967/eccomas.2022.085","DOIUrl":"https://doi.org/10.23967/eccomas.2022.085","url":null,"abstract":"","PeriodicalId":384863,"journal":{"name":"8th European Congress on Computational Methods in Applied Sciences and Engineering","volume":"1 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":"121818978","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
Phase field model for simulating fracture of ice 模拟冰断裂的相场模型
8th European Congress on Computational Methods in Applied Sciences and Engineering Pub Date : 1900-01-01 DOI: 10.23967/eccomas.2022.219
Rabea Sondershaus, Ralf M¨uller
{"title":"Phase field model for simulating fracture of ice","authors":"Rabea Sondershaus, Ralf M¨uller","doi":"10.23967/eccomas.2022.219","DOIUrl":"https://doi.org/10.23967/eccomas.2022.219","url":null,"abstract":". In the last decade, the phase field model has been established to simulate crack nucleation as well as crack propagation. In this variational approach the physically discontinuity of a crack is modeled by a continuous field variable that distinguishes between intact and broken material. The phase field model has been recently extended to viscoelastic materials in various ways, in which the rate dependent response of viscoelastic materials are taken into account. We propose a viscoelastic fracture phase field model and apply it to simulate the fracture in ice shelves. Thereby we consider the viscoelastic rheology of ice, which can be represented by a Maxwell model. The elastic response is often neglected in ice dynamic simulations but crucial for fracture mechanical studies. The numerical examples of this contribution are implemented and conducted in the finite element software FEniCS and data mimic typical situations in Antarctic and Greenland ice shelves.","PeriodicalId":384863,"journal":{"name":"8th European Congress on Computational Methods in Applied Sciences and Engineering","volume":"35 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":"117048731","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
Development of a low-level, algebra-based library to provide platform portability on hybrid supercomputers 开发一个低级的、基于代数的库，在混合超级计算机上提供平台可移植性
8th European Congress on Computational Methods in Applied Sciences and Engineering Pub Date : 1900-01-01 DOI: 10.23967/eccomas.2022.090
X. Álvarez-Farré, À. Alsalti-Baldellou, G. Colomer, A. Gorobets, F. Trias, A. Oliva
{"title":"Development of a low-level, algebra-based library to provide platform portability on hybrid supercomputers","authors":"X. Álvarez-Farré, À. Alsalti-Baldellou, G. Colomer, A. Gorobets, F. Trias, A. Oliva","doi":"10.23967/eccomas.2022.090","DOIUrl":"https://doi.org/10.23967/eccomas.2022.090","url":null,"abstract":"","PeriodicalId":384863,"journal":{"name":"8th European Congress on Computational Methods in Applied Sciences and Engineering","volume":"7 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":"121082332","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
Seismic performance of dissipative automated rack supported warehouses 耗散式自动化架架仓库的抗震性能
8th European Congress on Computational Methods in Applied Sciences and Engineering Pub Date : 1900-01-01 DOI: 10.23967/eccomas.2022.241
A. Natali, F. Morelli
{"title":"Seismic performance of dissipative automated rack supported warehouses","authors":"A. Natali, F. Morelli","doi":"10.23967/eccomas.2022.241","DOIUrl":"https://doi.org/10.23967/eccomas.2022.241","url":null,"abstract":". In this paper, performance of dissipative reduced-section diagonals implemented in Automated Rack Supported Warehouses (ARSWs) is analysed. ARSWs are storage systems where the steel racks traditionally used to store goods only, constitute also the primary system of the building. Given the lack of a reference design code to design these structures as seismic-resistant, and starting from a critical analysis of the current design approaches, a proper design strategy for these structures has been developed, which is based on the possibility to dissipate seismic energy in the bracings. However, the design of an over-resistant connection that would allow the yielding of the bracings is quite tricky due to the very low thickness of the elements usually adopted for these structures and is only possible by reducing the cross section of the profile. A wide experimental campaign is preformed to validate the behaviour of these diagonals, to be later implemented in the global numerical model of the structure to measure the effective performances of the case study ARSWs, both at local and global level.","PeriodicalId":384863,"journal":{"name":"8th European Congress on Computational Methods in Applied Sciences and Engineering","volume":"78 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":"127297022","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: 3
Simulation of soft robots with nonlinear material behavior using the cosserat rod theory 具有非线性材料行为的软体机器人的交叉棒理论仿真
8th European Congress on Computational Methods in Applied Sciences and Engineering Pub Date : 1900-01-01 DOI: 10.23967/eccomas.2022.252
M. Grube, R. Seifried
{"title":"Simulation of soft robots with nonlinear material behavior using the cosserat rod theory","authors":"M. Grube, R. Seifried","doi":"10.23967/eccomas.2022.252","DOIUrl":"https://doi.org/10.23967/eccomas.2022.252","url":null,"abstract":". For the simulation and model-based control of soft robots accurate models are required. In this contribution the simulation of a simple soft robot with the cosserat rod theory is examined for both linear and nonlinear material models. The soft robot is fabricated out of silicone. Thereby stiffness and damping properties are investigated. In addition to the achievable accuracy, the computation time is also examined.","PeriodicalId":384863,"journal":{"name":"8th European Congress on Computational Methods in Applied Sciences and Engineering","volume":"33 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":"125790495","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
Voxel-based density registration of trabecular bone: a longitudinal HR-pQCT study of postmenopausal women 基于体素的骨小梁密度登记:绝经后妇女的纵向HR-pQCT研究
8th European Congress on Computational Methods in Applied Sciences and Engineering Pub Date : 1900-01-01 DOI: 10.23967/eccomas.2022.293
J. Du, M. Huang, S. Li, V. Silberschmidt
{"title":"Voxel-based density registration of trabecular bone: a longitudinal HR-pQCT study of postmenopausal women","authors":"J. Du, M. Huang, S. Li, V. Silberschmidt","doi":"10.23967/eccomas.2022.293","DOIUrl":"https://doi.org/10.23967/eccomas.2022.293","url":null,"abstract":". Bone mineral density (BMD) is one of the important parameters used to characterise bone quality. Clinically, the only recommended method - dual X-ray absorptiometry - can only evaluate a two-dimensional areal BMD. Currently, three-dimensional localised BMD information is absent. HR-pQCT enables the assessments of 3D microstructure down to trabecular bone. Therefore, in this study, a voxel-based density registration (VDR) method is proposed to analyse the longitudinal changes of trabecular-bone density distribution. The VDR techniques were evaluated based on a six-month longitudinal study of five postmenopausal women. The time effect on localised changes of trabecular-bone mineral density was visualized and variations between different anatomical regions were quantified for the first time. Different distributions between anatomical regions were found in bone mineral density of trabecular bone (vBMD trab ), with a change of vBMD trab at medial region (-0.56%) significantly higher than anterior (-1.58%) (p = 0.032). This study indicates that localised density changes might be used as a prior indicator for the effect of aging or other interventions.","PeriodicalId":384863,"journal":{"name":"8th European Congress on Computational Methods in Applied Sciences and Engineering","volume":"43 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":"123523755","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
Mathematical modeling and numerical results on the propagation of solitary waves on tensegrity lattices 孤立波在张拉整体格上传播的数学模型和数值结果
8th European Congress on Computational Methods in Applied Sciences and Engineering Pub Date : 1900-01-01 DOI: 10.23967/eccomas.2022.173
A. Amendola, F. Fraternali, G. Saccomandi
{"title":"Mathematical modeling and numerical results on the propagation of solitary waves on tensegrity lattices","authors":"A. Amendola, F. Fraternali, G. Saccomandi","doi":"10.23967/eccomas.2022.173","DOIUrl":"https://doi.org/10.23967/eccomas.2022.173","url":null,"abstract":". This work discusses the mathematical properties of the interaction potential that characterizes tensegrity mass-spring chains, and its implications in terms of the propagation of compact compression waves in such systems when impacted by a striker. Numerical simulations show evidence of the dependence of the wave form on the speed of the propagating compression pulses, which change shape when passing from the sonic to the super-sonic wave propagation regime","PeriodicalId":384863,"journal":{"name":"8th European Congress on Computational Methods in Applied Sciences and Engineering","volume":"PP 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":"126637238","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
Wave Based Method for 2D Unsaturated Elastodynamic Soil under Harmonic Loading 谐波荷载作用下二维非饱和弹动力土的波浪法
8th European Congress on Computational Methods in Applied Sciences and Engineering Pub Date : 1900-01-01 DOI: 10.23967/eccomas.2022.295
M. Lainer, G. Müller
{"title":"Wave Based Method for 2D Unsaturated Elastodynamic Soil under Harmonic Loading","authors":"M. Lainer, G. Müller","doi":"10.23967/eccomas.2022.295","DOIUrl":"https://doi.org/10.23967/eccomas.2022.295","url":null,"abstract":"M. Lainer, Prof. Dr.-Ing. G. Müller 1 Chair of Structural Mechanics, TUM School of Engineering and Design, Technical University of Munich, Arcisstraße 21, 80333 Munich, Germany, mirjam.lainer@tum.de, https://www.cee.ed.tum.de/bm 2 Chair of Structural Mechanics, TUM School of Engineering and Design, Technical University of Munich, Arcisstraße 21, 80333 Munich, Germany, gerhard.mueller@tum.de, https://www.cee.ed.tum.de/bm","PeriodicalId":384863,"journal":{"name":"8th European Congress on Computational Methods in Applied Sciences and Engineering","volume":"97 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":"115056680","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
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