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Modelling Wave-Structure-Foundation Interaction for Marine Gravity Structures (WaSFI)

海洋重力结构的波浪-结构-基础相互作用建模 (WaSFI)

基本信息

批准号：
310375313
负责人：
Dr.-Ing. Hisham Elsafti
金额：
--
依托单位：
Leichtweiß-Institut für Wasserbau
依托单位国家：
德国
项目类别：
Research Grants
财政年份：
2016
资助国家：
德国
起止时间：
2015-12-31 至 2020-12-31
项目状态：
已结题

来源：
https://gepris.dfg.de/gepris/projekt/310375313?language=en
关键词：
Modelling Wave Structure Foundation Interaction

项目摘要

This project primarily aims at developing a partitioned strongly coupled CFD-CSD model system in OpenFOAM, named wasfiFoam, for the simulation of wave-structure-foundation interaction (WaSFI) with a particular focus on stepwise failure of marine gravity structures. The similarity between the Navier-Stokes and the fully dynamic, coupled Biot equations will be utilized for solving the fluid mass and momentum balance equations simultaneously inside and outside deformable porous media with an Eulerian fluid mesh. A Lagrangian background mesh will be used to solve the momentum balance equation of the skeleton-fluid mixture with modelling of soil plasticity under cyclic loading and frictional contact for soil-structure interaction. The immersed boundary method (IBM) will be used to update the fluid domain depending on the structure motions. The solution of the soil constitutive relation will be implemented in GPUs to reduce the computational time. A multiphase fluid treatment with inter-phase momentum transfer and a Volume-Of-Fluid (VOF) approach for describing the air-water interface will be considered. Moreover, wafsiFoam will be coupled with a far-field wave model to provide more realistic wave conditions (e.g. tsunamis and storm surges). wasfiFoam and its constituents will be validated against benchmark cases as well as available large-scale model tests from the Large Wave Flume (GWK). The validated model system will be applied for an extensive parameter study aiming at (i) enhancing the insight in the processes underlying the stepwise failure mechanism of marine gravity structures (e.g. effect of structure rocking motion on uplift pressure, effects of air bubble kinematics on breaking wave impact and pore fluid compressibility/soil consolidation, etc.), (ii) consolidating and refining the Load eccentricity concept developed in the PhD study of the Principal Applicant, together with a more precise definition of the four LEC regimes proposed for marine gravity structures under different wave conditions, and (iii) refining and extending the simplified nonlinear mass-spring-dashpot model (also developed in the aforementioned PhD study) to include more complex structure configurations. wasfiFoam, together with further tools and results generated in the project, will be well-documented and published under the GNU General Public License (GPL).

本项目主要目的是在OpenFOAM中开发一个分区强耦合CFD-CSD模型系统，名为wasfiFoam，用于模拟波浪-结构-基础相互作用（WaSFI），特别关注海洋重力结构的逐步破坏。Navier-Stokes方程和完全动态耦合的毕奥方程之间的相似性将被用于同时求解具有欧拉流体网格的可变形多孔介质内部和外部的流体质量和动量平衡方程。将使用拉格朗日背景网格来求解流体-流体混合物的动量平衡方程，并对循环荷载下的土壤塑性和土壤-结构相互作用的摩擦接触建模。浸没边界法（IBM）将用于根据结构运动更新流体域。土壤本构关系的解决方案将在GPU中实现，以减少计算时间。一个多相流体处理与相间动量传递和体积的流体（VOF）的方法来描述空气-水界面将被考虑。此外，wafsiFoam将与远场波浪模型相结合，以提供更真实的波浪条件（例如海啸和风暴潮）。wasfiFoam及其成分将根据基准案例以及来自大型波浪水槽（GWK）的可用大型模型测试进行验证。经验证的模型系统将用于广泛的参数研究，目的是（i）提高对海洋重力结构逐步破坏机制的过程的认识（例如结构摇摆运动对扬压力的影响、气泡运动学对破碎波冲击和孔隙流体压缩性/土壤固结的影响等），(ii)巩固和完善在主申请人的博士研究中开发的载荷偏心概念，以及在不同波浪条件下为海洋重力结构提出的四种LEC状态的更精确定义，以及（iii）完善和扩展简化的非线性质量-弹簧-阻尼器模型（也在上述博士研究中开发）以包括更复杂的结构配置。wasfiFoam以及项目中产生的其他工具和成果将在GNU通用公共许可证（GPL）下进行详细记录和发布。