Development of numerical and experimental methods for resolving of concentrated vortex structures

开发解决集中涡结构的数值和实验方法

基本信息

批准号：
263936466
负责人：
Professor Dr.-Ing. Moustafa Abdel-Maksoud
金额：
--
依托单位：
Lehrstuhl für Modellierung und Simulation
依托单位国家：
德国
项目类别：
Research Grants
财政年份：
2015
资助国家：
德国
起止时间：
2014-12-31 至 2017-12-31
项目状态：
已结题

来源：
https://gepris.dfg.de/gepris/projekt/263936466?language=en
关键词：
Development numerical experimental methods resolving

项目摘要

The resolving of vortex structures is one of the main problems in computational fluid dynamics. The overall objective of this project is to develop numerical technologies that can detect a wider range of vortex scales. In the project, two strategies are pursued. One is based on the development of the vorticity confinement (VC) method, while the other is based on a new concept that combines the grid-based finite volume method (FVM) with the grid-free vortex method (CVM). Both strategies aim to reduce the amount of numerical diffusion present in all existing numerical methods. As part of the vorticity confinement method, an additional term that can act against numerical diffusion is introduced into the momentum equation. This term will be calculated based on the grid-free vortex method (CVM). In the hybrid FVM-CVM method, the vortices are divided into large-scale and small-scale structures, where the former is then modelled with FVM and the latter with CVM. Both of these methods will be validated using in the literature available experimental results for tip vortex flow behind wings. The joint development of vortex structure identification algorithms, their implementation in FVM OpenFoam and their validation of the same test cases as well as the integration of CVM results in the VC-method show that these the both parts of the project are strongly interconnected, and the developed methods can be used for a wide range of fundamental and related problems in fluid mechanics.

涡结构的求解是计算流体动力学的主要问题之一。该项目的总体目标是开发能够检测更广泛涡旋尺度的数值技术。在该项目中，采取了两种策略。一种是基于涡度约束（VC）方法的发展，另一种是基于基于网格的有限体积法（FVM）与无网格涡旋法（CVM）相结合的新概念。这两种策略都旨在减少所有现有数值方法中存在的数值扩散量。作为涡度限制方法的一部分，动量方程中引入了一个可以对抗数值扩散的附加项。该术语将基于无网格涡旋法（CVM）进行计算。在混合FVM-CVM方法中，涡被分为大尺度和小尺度结构，前者用FVM建模，后者用CVM建模。这两种方法都将使用文献中可用的机翼后叶尖涡流实验结果进行验证。涡结构识别算法的联合开发、它们在 FVM OpenFoam 中的实现、对相同测试用例的验证以及 CVM 结果在 VC 方法中的集成表明，该项目的两个部分是紧密关联的，并且开发的方法可用于解决流体力学中的各种基本和相关问题。