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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的方法，用于模拟湍流风中轻质柔性结构的瞬态流固耦合。对于轻质结构的设计，与高涡流的强相互作用是至关重要的。在第一阶段，一个专门的分区FSI模拟方法的基础上，以及建立solvers为两个学科和耦合接口的开发和评估，考虑到这两个领域的具体属性和特征尺度。主要成果有：1.稳健、高效、全面验证的涡解方法（LES）与薄壁柔性结构耦合方法。2.应用伊加和精确耦合层ECL，大大改进了几何和运动学建模（目前用于非裁剪NURBS曲面）。3.应用新开发的耦合软件EMPIRE进行基于EBS的几何建模。4.首次将新的流固耦合模拟方法应用于充气膜结构。在继续的最终目标是追求：在流体方面的涡解决方案和直接连接的流固耦合算法必须在两个方面进一步发展：关于数值/方法问题，一个适当的网格变形算法必须开发，这使得新实现的高网格质量的表面网格在界面上的CFD体积网格。然而，它是决定性的，以明确考虑到额外的计算工作，并考虑耦合LES-FSI方法的特殊要求。关于物理/方法问题，迫切需要对湍流入流条件进行现实的描述。然而，由于轻型结构主要是由偶尔出现的强风阵风，湍流inflowgenerator将开发这一高度动态的负载scenaries.On结构方面的主要重点在于进一步有条不紊的发展的补丁和表面耦合方法为实际相关的情况下，修剪多补丁的几何形状的CAD生成。我们的目标是提供一个适当的几何和运动学公式，具有适当的几何表面特性，也修剪补丁和补丁接口（修剪，非修剪等）。满足极细LES网格高分辨率的要求。进一步发展了两种策略：（1）FVM求解器与等几何结构模型的直接表面耦合和（2）耦合到任意结构模型，例如使用ECL作为中介层的具有较低连续性属性的经典FEM。基于这整个方法，将考虑暴露于湍流风（包括强阵风）的真实柔性结构的详细模拟和分析。