Automatic simulation techniques for 3D wave propagation in geological media
地质介质中 3D 波传播的自动模拟技术
基本信息
- 批准号:418778046
- 负责人:
- 金额:--
- 依托单位:
- 依托单位国家:德国
- 项目类别:Research Grants
- 财政年份:2018
- 资助国家:德国
- 起止时间:2017-12-31 至 2022-12-31
- 项目状态:已结题
- 来源:
- 关键词:
项目摘要
This project addresses the efficient numerical simulation of wave propagation in large geological regions. This is of crucial importance in a number of safety and sustainability related applications such as seismic failure of critical infrastructure, geological exploration or detection of underground objects. While the related complex wave reflection and refraction phenomena are inherently spatial, there is a lack of simulation techniques that can address the large-scale dynamic problem in its full complexity. In soil regions of very large extent radiation damping of outgoing deformation waves occurs, which must be represented accurately in finite computational models. Wave propagation simulation is associated with particular meshing requirements depending on the material properties and frequency content. The generation of high quality meshes for heterogeneous geological domains containing features of very different scale is highly labour intensive and requires considerable experience. The computational effort associated with nonlinear time-domain analysis of 3D wave propagation in realistic geological regions can be prohibitive.These challenges are addressed as follows. The main objective is to develop a fully automatic meshing and analysis approach for wave propagation in three-dimensional heterogeneous soil regions. Here, efficiency is of crucial importance due to the large scale of the problem. A highly flexible meshing approach will be devised, which both reduces the burden of manual mesh generation and leads to optimized numerical models both in terms of accuracy and efficiency. Structured meshes will be used, which allow for the rapid and thus highly efficient refinement of computational grids near geometrical discontinuities or in plastic zones. At the same time, the superior convergence behaviour of spectral elements for wave propagation problems will be exploited. To achieve this, a strategy for the automatic assignment of element orders in various regions based on the material properties and frequency content will be developed. Moreover, we seek to rigorously and efficiently represent radiation damping in order to keep the near field size to the required minimum dimensions. To address the above objectives, the scaled boundary finite element method (SBFEM) will be used. The latter excels in modelling waves in unbounded domains. It can be used on structured meshes straightforwardly and thus provides a potential framework for highly efficient analysis. An automatic octree / polyhedral meshing technique will be developed and specifically tailored to the requirements of wave propagation. The resulting model will be coupled to a unit-impulse-response-based formulation of the SBFEM to represent the far field. The final automatic meshing and analysis tool will facilitate the realistic simulation of three-dimensional wave radiation and scattering processes in highly heterogeneous geological domains including dynamic nonlinear phenomena.
本项目解决了大型地质区域波浪传播的有效数值模拟问题。这在一些安全和可持续性相关的应用中至关重要,例如关键基础设施的地震破坏、地质勘探或地下物体的探测。虽然相关的复杂波反射和折射现象本质上是空间的,但缺乏能够解决其全部复杂性的大规模动态问题的模拟技术。在很大程度上,土区会发生向外变形波的辐射阻尼,这必须用有限的计算模型来精确地表示。波传播模拟与特定的网格要求相关联,这取决于材料特性和频率内容。为包含不同尺度特征的非均质地质域生成高质量网格是高度劳动密集型的,需要大量的经验。在实际的地质区域中,三维波传播的非线性时域分析的计算工作量可能是令人望而却步的。这些挑战的解决方法如下。主要目的是开发一种三维非均质土壤区域波浪传播的全自动网格划分和分析方法。在这里,由于问题的规模很大,效率是至关重要的。设计了一种高度灵活的网格划分方法,既减少了手工网格生成的负担,又在精度和效率方面优化了数值模型。将使用结构化网格,它允许在几何不连续或塑性区域附近快速高效地细化计算网格。同时,将利用谱元在波传播问题中的优越收敛特性。为了实现这一目标,将开发一种基于材料特性和频率内容在各个区域自动分配元素顺序的策略。此外,我们寻求严格和有效地表示辐射阻尼,以保持近场尺寸所需的最小尺寸。为了实现上述目标,将使用缩放边界有限元法(SBFEM)。后者擅长模拟无界域中的波。它可以直接用于结构化网格,从而为高效分析提供了一个潜在的框架。将开发一种自动八叉树/多面体网格技术,并专门针对波传播的要求进行定制。所得到的模型将与基于单位脉冲响应的SBFEM公式相耦合,以表示远场。最终的自动网格划分和分析工具将有助于在包括动态非线性现象在内的高度非均质地质域中逼真地模拟三维波辐射和散射过程。
项目成果
期刊论文数量(0)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
专利数量(0)
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Professorin Dr.-Ing. Carolin Birk其他文献
Professorin Dr.-Ing. Carolin Birk的其他文献
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{{ truncateString('Professorin Dr.-Ing. Carolin Birk', 18)}}的其他基金
Determination of all acoustic material parameters of polymers II
聚合物 II 所有声学材料参数的测定
- 批准号:
409779252 - 财政年份:2018
- 资助金额:
-- - 项目类别:
Research Grants
CISM-Kurs "Computational Aspects of Structural Acoustics and Vibration" (19.-23.06.2006 in Udine/Italien)
CISM 课程“结构声学和振动的计算方面”(2006 年 6 月 19 日至 23 日,意大利乌迪内)
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30738037 - 财政年份:2006
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-- - 项目类别:
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Efficient image-based simulation techniques for 3D phase-field modelling of fracture processes in micro-heterogeneous materials
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444616865 - 财政年份:
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529593906 - 财政年份:
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Research Units
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