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Influence of breach parameter models on hazard classification of off-stream reservoirs

水科学与水工程 2025年第1期18卷 102-114页

作者： Nathalia Silva-Cancino Fernando Salazar Ernest Bladé Marcos Sanz-Ramos International Centre for Numerical Methods in Engineering(CIMNE) Barcelona 08034Spain International Centre for Numerical Methods in Engineering(CIMNE) Barcelona 08034Spain Flumen Institute Universitat Politècnica de Catalunya-CIMNEBarcelona 08034Spain Flumen Institute Universitat Politècnica de Catalunya-CIMNEBarcelona 08034Spain

The classification of dams or off-stream reservoirs concerning potential hazards in the event of failure often involves the use of two-dimensional hydraulic models for computing floodwave *** models necessitate defining breach geometry and formation time,for which various parametric models have been *** models yield different values for average breach width,time of failure,and consequently,peak flows,as demonstrated by several *** study analyzed the effect of selecting a breach parametric model on the hydraulic variables,potential damages,and hazard classification of *** common parametric models were compared using a set of synthetic cases and a real off-stream *** indicated significant effects of model *** erodibility exerted a significant impact,surpassing that of fail-ure *** factors,such as the Manning coefficient,significantly affected the *** an inadequate model or lacking information on dike material can lead to overly conservative or underestimated outcomes,thereby affecting hazard classification.

关键词： Dam breach Off-stream reservoir Hazard classification Flooding Potential damages

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A Comparative Review of FEM Like Techniques Applied to the Linear Analysis of Molecular Structures

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Archives of Computational methods in engineering 2025年 1-28页

作者： Fernández-San Miguel, Andrés Ramírez, Luis Couceiro, Iván Navarrina, Fermín Group of Numerical Methods in Engineering-GMNI Center for Technological Innovation in Construction and Civil Engineering-CITEEC Civil Engineering School Universidade da Coruña Campus de Elviña A Coruña15071 Spain

In this study, a historical review of the Finite Element Method (FEM) and Molecular Dynamics (MD), widely used at the macro and nanoscale respectively is presented, emphasizing the actual parallelisms between their development and applications. After this historical introduction, where certain similarities between both methods are pointed out, different FEM-like methods are analyzed and compared as for first order analysis of structures at the nanoscale. Firstly, the Structural Mechanics (SM) approach is analyzed, where it is assumed that the use of Euler Bernoulli beam elements is equivalent to working directly from the force field. On the other hand, the Molecular Element Method (MEM), which provides the stiffness matrices directly from the potentials, is analyzed. Several analytical static cases are studied for the validation and comparison of both methods. Finally, it is shown that, other branch of methods such as Elastic Network Models (ENM) can be viewed as a particular sub-case of the MEM, or as truss-type finite elements. As an example, the analysis of SARS-CoV2 spikes vibrations is included, comparing with both experimental results and continuous models. © The Author(s) 2025.

关键词： Stiffness matrix

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Designing a framework for seamless integration of open data services to support disaster response 14th

Designing a framework for seamless integration of open data ...

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14th European Conference on Product and Process Modelling, ECPPM 2022

作者： Huyeng, T.J. Bittner, T. Rüppel, U. Institute of Numerical Methods and Informatics in Civil Engineering Technische Universität Darmstadt Germany

ISBN: (纸本)9781032406732

With an increase to the availability of open data, the potential to leverage it for emergency response and disaster management has so far seen seldom use in Germany. While some modern technologies have found their place in existing workflows, open data and related services are rarely utilized. Due to varying standards and approaches in the federal system, public sector as well as community data sources often cannot be easily integrated. As such, an adaptable framework is proposed that outlines a way for practitioners to include these services via the OpenAPI specification without the need for programming or data science knowledge. Instead, the API documentation is parsed by an application offering various customization and configuration options during a mapping process enabling users to create their own interpretation of the data for beneficial use during disaster response efforts, resulting in a dashboard with map views and other visualizations. © 2023 the Author(s).

关键词： Open Data

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An Open-Source Approach for a Seamless BIM-GIS Integration 20th

An Open-Source Approach for a Seamless BIM-GIS Integration

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20th International Conference on Computing in Civil and Building engineering, ICCCBE 2024

作者： Xia, Zhongxin Kandler, Benedikt Schmidt, Jakob Volland, Vivien Mosler, Pascal Eichhorn, Andreas Rüppel, Uwe Institute of Numerical Methods and Informatics in Civil Engineering Technical University of Darmstadt Darmstadt Germany Institute of Geodesy Technical University of Darmstadt Darmstadt Germany

ISBN: (纸本)9783031842078

With global climate change and the progressing digitization of infrastructural projects, the BIM (Building Information Modeling)-method has become increasingly significant. For planning and managing BIM projects, GIS data is crucial, e.g., in the form of environmental data. Especially for large-scale infrastructure projects, integrating BIM models and GIS (Geographic Information System) data provides advantages. With an information-rich platform that aggregates geographic and infrastructural design information to provide geometric 3D visualization combined with semantic information, processing infrastructural projects can be simplified. Many integrated solutions require complex algorithms and additional manual work for converting and visualizing BIM models. This process potentially leads to the loss of model information or contradictory data. In addition, commercial software is required. We present a new approach for the BIM-GIS integration based on open-source frameworks. Various types of BIM and GIS files can be uploaded to the application. The files are unified in one 3D environment with absolute reference, for which the coordinate reference system of each file is temporarily converted to a user-definable coordinate reference system within the backend. The original files remain unchanged, so the application serves as a viewer and allows the user to view all geographical and infrastructural information. Furthermore, various tasks like coordinate transformation and geometric measurement can be performed. Besides the viewer functionality, the application enables users to annotate the data and provide feedback on the issues found in the BIM models. That allows various stakeholders to share their insights, which is crucial for managing infrastructural projects and seamlessly displaying BIM models and GIS data. © The Author(s), under exclusive license to Springer Nature Switzerland AG 2025.

关键词： Climate change

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Investigation of transonic aerodynamics on a triple-delta wing in side slip conditions

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CEAS Aeronautical Journal 2022年第2期13卷 453-470页

作者： Di Fabbio, Tony Tangermann, Eike Klein, Markus Numerical Methods in Aerospace Engineering Institute of Applied Mathematics and Scientific Computing Bundeswehr University Munich Neubiberg85577 Germany

The vortex-dominated flow around the triple-delta wing ADS-NA2-W1 aircraft is investigated in order to achieve a better understanding of the flow physics phenomena that occur over the aircraft particularly at the transonic speed condition. Both URANS and scale-resolving DDES have been employed in order to explore the range of suitability of current CFD methods. The Spalart–Allmaras One-Equation Model with corrections for negative turbulent viscosity and Rotation/Curvature (SA-negRC) is employed to close the RANS equations, whereas the SAneg-based DDES model is applied in the scale-resolving computations. The DLR TAU-Code is used to perform the numerical simulations. The deficiencies of the URANS results are illustrated and promising improvements are reached employing the SAneg-DDES numerical method. The hybrid method results show great advancement in the prediction of the multiple-delta wing flow by revealing physical aspects which have not been seen from URANS with sufficient accuracy like vortex–vortex interaction and shock-vortex interaction. These phenomena furthermore explain in a clear way the improved prediction of the surface pressure coefficient over the aircraft and consequently of the aerodynamic force and moment coefficients. © 2022, The Author(s).

关键词： Vortex flow

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Sensitivity of Laminar Separation to Geometric Uncertainties

Sensitivity of Laminar Separation to Geometric Uncertainties

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AIAA Science and Technology Forum and Exposition, AIAA SciTech Forum 2025

作者： Tangermann, Eike Dierl, Wolfgang Klein, Markus Numerical Methods in Aerospace Engineering University of the Bundeswehr Munich Neubiberg85577 Germany Fluid Dynamics and Aerodynamics University of the Bundeswehr Munich Neubiberg85577 Germany

ISBN: (数字)9781624107238

ISBN: (纸本)9781624107238

Within the present work, the process of laminar separation is investigated with respect to uncertainties of the geometric setup. It is well known, that the results from different experimental studies with a comparable setup show a range of variations depending on many factors of the specific case. Some of these factors can be attributed to variations of the model geometry. Therefore, numerical flow simulations with a well defined SD7003 wing geometry have been performed in order to quantify the sensitivity of the flow to two different factors, namely deviations of the wing surface and deviations of the angle of attack. For the first case, results are compared from an ideal wing and one based on a measured experimental model. Results from the corresponding experiment are featured as well for a comprehensive comparison. It will be shown that for low angles of attack with a larger region of laminar flow the impact is significant, whereas it decreases drastically at slightly higher angles of attack with a smaller laminar zone. Finally, simulation results for slight variations of the angle of attack show that these also have an impact to the flow especially at low angles of attack. © 2025, American Institute of Aeronautics and Astronautics Inc, AIAA. All rights reserved.

关键词： Laminar flow

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numerical analysis of anisotropic stiffness and strength for geomaterials

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Journal of Rock Mechanics and Geotechnical engineering 2023年第2期15卷 323-338页

作者： Fei Song Manuel A.González-Fernández Alfonso Rodriguez-Dono Leandro R.Alejano Department of Civil and Environmental Engineering Universitat Politècnica de Catalunya(UPC)Barcelona08034Spain CINTECX GESSMin GroupDepartment of Natural Resources and Environmental EngineeringUniversity of VigoVigo36310Spain International Centre for Numerical Methods in Engineering(CIMNE) Barcelona08034Spain

In numerical modelling,selection of the constitutive model is a critical factor in predicting the actual response of a *** use of oversimplified or inadequate models may not be sufficient to reproduce the actual geomaterial *** selection is especially relevant in the case of aniso-tropic rocks,and particularly for shales and slates,whose behaviour may be affected,*** stability in geothermal or oil and gas production *** this paper,an alternative anisotropic constitutive model has been implemented in the finite element method software CODE_BRIGHT,which is able to account for the anisotropy of shales and slates in terms of both deformability and *** this purpose,a transversely isotropic version of the generalised Hooke’s law is adopted to represent the stiffness anisotropy,while a nonuniform scaling of the stress tensor is introduced in the plastic model to represent the strength ***,a detailed approach has been proposed to determine the model parameters based on the stressestrain results of laboratory ***,numerical analyses are performed to model uniaxial and triaxial tests on Vaca Muerta shale,Bossier shale and slate from the northwest of Spain(NW Spain slate).The experimental data have been recovered from the literature in the case of the shale and,in the case of the slate,performed by the authors in terms of stress-strain curves and strengths.A good agreement can be generally observed between numerical and experi-mental results,hence showing the potential applicability of the approach to actual case ***,the presented constitutive model may be a promising approach for analysing the anisotropic behaviour of rocks and its impact on well stability or other relevant geomechanical problems in aniso-tropic rocks.

关键词： Rock mechanics Anisotropy numerical modelling CODE_BRIGHT Shale Slate

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A Multi-stage Approach to Understand GIS Model Enrichment Used for Decision-Making Support When Developing Energy Retrofit Strategies on a Neighborhood Level 19th

A Multi-stage Approach to Understand GIS Model Enrichment U...

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19th International Conference on Computing in Civil and Building engineering, ICCCBE 2022

作者： Thiele, Christian-Dominik Zadeh, Puyan A. Hashempour, Najme Staub-French, Sheryl Rüppel, Uwe Institute of Numerical Methods and Informatics in Civil Engineering Technical University of Darmstadt Darmstadt Germany Project Management and Construction Group Department of Civil Engineering University of British Columbia Vancouver Canada

ISBN: (纸本)9783031353987

In the AEC sector, energy performance targets of buildings continuously increase for contributing to reduce carbon dioxide. This is usually done on building level, but the focus continuously shifts to larger scales such as neighborhoods, e.g. for identifying buildings with the most retrofitting potential. For this, low detailed GIS models can serve as a basis for energy simulations and are broadly available. However, neighborhood energy simulations hold many challenges, such as the lack of accurate and sufficient data to perform reliable simulations. Information such as window positions or thermal parameters of the building elements can thereby help to increase the quality of the energy simulation results. Therefore, in this paper, challenges of data collection are presented and discussed. To enable users to find a trade-off between accuracy and reliability of a neighborhood simulation and the effort to provide this data, the authors developed the concept of the Neighborhood Model States (NMS). Furthermore, occurring challenges in enriching the GIS model for each NMS are discussed on the example of buildings from the UBC campus. © 2024, The Author(s), under exclusive license to Springer Nature Switzerland AG.

关键词： Retrofitting

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Statistical assessment of the financial performance of shale-gas wells coupling stochastic and numerical simulation

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Petroleum Science 2024年第6期21卷 4497-4511页

作者： Andres Soage Luis Ramirez Ruben Juanes Luis Cueto-Felgueroso Ignasi Colominas Group of Numerical Methods in Engineering-GMNI Center for TechnologicalInnovation in Construction and Civil Engineering-CITEEC.Civil Engineering SchoolUniversity of a CorunaCampus of ElvinaA Coruna15008GaliciaSpain Department of Civil Engineering:Hydraulics Energy and Environment.Polytechnic University of MadridMadrid2006Spain Department of Civil and Environmental Engineering Massachusetts Institute of TechnologyCambridge02139MAUA Department of Earth Atmospheric and Planetary SciencesMassachusetts Institute of TechnologyCambridge239MAUSA

We present a new methodology to statistically determine the net present value(NPV)and internal rate of return(IRR)as financial estimators of shale gas *** method allows us to forecast,in a fully probabilistic setting,financial performance risk and to understand the importance of the different factors that impact *** methodology developed in this study combines,through Monte Carlo simulation,the computational modeling of gas production from shale gas wells with a stochastic simulation of gas price as a geometric Brownian motion(GMB).To illustrate the methodology's validity,we apply it to an analysis of investments in shale gas *** results show that gas price volatility is a key variable in the performance of an investment of this type,in such a way that at high volatilities,the potential return on an investment in shale gas increases significantly,but so do the risks of economic *** finding is consistent with the history of shale gas operations in which huge investment successes coexist with unexpected investment failures.

关键词： Gas volatility Shale gas Net presentvalue Internal ratereturn Stochastic model Financial estimator MonteCarlosimulation Kernel densityfunction

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Exploring the Impact of Laser Drilling on Material Thermal Decomposition: A Computational Study Using KratosMultiphysics 25

Exploring the Impact of Laser Drilling on Material Thermal D...

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25th International Conference on Thermal, Mechanical and Multi-Physics Simulation and Experiments in Microelectronics and Microsystems, EuroSimE 2024

作者： Peng, Chongnan Tao, Qi Krivec, Thomas Casas, Guillermo Latorre, Salvador Antretter, Thomas Macher, Johannes Fuchs, Peter Polymer Competence Center Leoben GmbH Austria Institute of Mechanics Montanuniversitaet Leoben Austria Austria Technologie & Systemtechnik Aktiengesellschaft Austria International Center for Numerical Methods in Engineering

ISBN: (纸本)9798350393637

Laser drilling has gained widespread popularity in industrial applications due to its precision, non-contact nature, speed, efficiency, and energy-saving attributes. This technology plays a vital role in the manufacturing of printed circuit boards (PCBs) and semiconductors. Additionally, femtosecond laser drilling has enhanced the capabilities of micro-and nano-fabrication of materials. The reliability of PCBs is heavily influenced by the laser drilling process. During laser drilling, numerous physical and chemical changes occur within a short timeframe, and the complexity of these changes remains a subject of ongoing investigation. Given the challenges of observing such rapid material transformations through experiments, simulation, and computational analysis offer a cost-effective alternative. KratosMultiphysics is a multi-physics solver employed to address a variety of process simulations across different fields. This paper initially gathered material parameters and recorded various test results under different laser drilling conditions for comparison with simulation outcomes. Utilizing KratosMultiphysics as a computational tool, we simulate the ablation of material with the subsequent heat conduction and decomposition of the polymer material according to a new numerical model. © 2024 IEEE.

关键词： KratosMultiophysics laser drilling PCB Prout-Tompkins model

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