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Eddy resolving simulation methodology for dynamic fluid-structure interactions of lightweight flexible surface structures

轻质柔性表面结构动态流固耦合的涡旋解析模拟方法

基本信息

批准号：
211249184
负责人：
Professor Dr.-Ing. Kai-Uwe Bletzinger
金额：
--
依托单位：
Institut für Statik und Dynamik
依托单位国家：
德国
项目类别：
Research Grants
财政年份：
2012
资助国家：
德国
起止时间：
2011-12-31 至 2018-12-31
项目状态：
已结题

来源：
https://gepris.dfg.de/gepris/projekt/211249184?language=en
关键词：
Eddy resolving simulation methodology dynamic

项目摘要

The objective of the project is to develop an optimized methodology for the simulation of transient fluid-structure interactions oflightweight flexible structures in turbulent wind flow. For the design of lightweight structures, the strong interaction with the turbulenthighly vortical flow is crucial. In the first period a dedicated partitioned FSI simulation methodology based on well establishedsolvers for both disciplines and a coupling interface was developed and evaluated, taking the specific properties and the characteristic scales of both fields into account. The main achievements are:1. Robust, efficient and comprehensively validated coupling method between eddy-resolving methods (LES) and thin-walled flexiblestructures. 2. Strongly improved modeling of the geometry and the kinematics (presently for non-trimmed NURBS surfaces) applying IGA andan exact coupling layer ECL. 3. Application of the newly developed coupling software EMPIRE for a NURBS-based geometry modeling. 4. First application of the new FSI simulation methodology to an inflated membrane structure. In the continuation the final goal is pursued:On the fluid side the eddy-resolving scheme and the directly connected FSI coupling algorithm has to be developed further in two regards: With respect to numerical/methodical issues an appropriate grid deformation algorithm has to be developed, which allows to transfer the newly achieved high grid quality of the surface mesh at the interface to the CFD volume grid. However, it is decisive to take distinctly the additional computational effort into account and to also consider the special requirements of the coupled LES-FSImethodology. With respect to physical/methodical issues a realistic description of the turbulent inflow conditions is urgentlyrequired. However, since lightweight structures are mainly loaded by sporadically appearing strong wind gusts, a turbulence inflowgenerator will be developed which takes this highly dynamic load scenario into account.On the structural side the main focus lies on the further methodical developments of the patch and surface coupling methods forpractically relevant cases of trimmed multi-patch geometries generated by CAD. The goal is to provide an appropriate geometric and kinematic formulation which possesses suitable geometric surface properties also on trimmed patches and at patch interfaces (trimmed, non-trimmed, etc.) and fulfill the requirements of the high resolution of the very fine LES grids. Two strategies are further developed: (1) A direct surface coupling of the FVM-solver with the isogeometric structural model and (2) a coupling to arbitrary structural models such as classical FEM possessing lower continuity properties using ECL as a mediator layer.Based on this entire methodology, detailed simulations and analyses of realistic flexible structures exposed to turbulent wind flows including strong gusts will be considered.

该项目的目标是开发一种优化方法来模拟湍流风流中轻质柔性结构的瞬态流固相互作用。对于轻质结构的设计，与湍流和高旋涡流的强相互作用至关重要。在第一阶段，开发和评估了基于两个学科的成熟求解器和耦合接口的专用分区 FSI 模拟方法，同时考虑了两个领域的具体属性和特征规模。主要成果有： 1．涡流解析方法 (LES) 与薄壁柔性结构之间稳健、高效且经过全面验证的耦合方法。 2. 应用 IGA 和精确耦合层 ECL，极大改进了几何和运动学建模（目前针对未修剪的 NURBS 曲面）。 3.应用新开发的耦合软件EMPIRE进行基于NURBS的几何建模。 4. 首次将新的 FSI 模拟方法应用于充气膜结构。继续追求最终目标：在流体侧，必须在两个方面进一步开发涡旋解决方案和直接连接的 FSI 耦合算法：对于数值/方法问题，必须开发适当的网格变形算法，该算法允许将界面处新实现的表面网格的高网格质量转移到 CFD 体积网格。然而，明确考虑额外的计算工作并考虑耦合 LES-FSI 方法的特殊要求是决定性的。关于物理/方法问题，迫切需要对湍流流入条件进行真实的描述。然而，由于轻质结构主要由偶尔出现的强阵风加载，因此将开发一种考虑到这种高动态载荷情况的湍流发生器。在结构方面，主要重点在于针对由 CAD 生成的修剪多面片几何形状的实际相关案例，进一步系统地开发面片和表面耦合方法。目标是提供适当的几何和运动学公式，该公式在修剪的斑块和斑块界面（修剪的、未修剪的等）上也具有合适的几何表面特性，并满足非常精细的 LES 网格的高分辨率要求。进一步开发了两种策略：(1) FVM 求解器与等几何结构模型的直接表面耦合，以及 (2) 与任意结构模型的耦合，例如使用 ECL 作为中介层的具有较低连续性的经典 FEM。基于整个方法，将考虑对暴露于包括强阵风在内的湍流风流中的真实柔性结构进行详细模拟和分析。