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Development and validation of a novel structure based method for artificial generation of inlet condition for LES

一种基于结构的新型方法的开发和验证，用于人工生成 LES 入口条件

基本信息

批准号：
247466387
负责人：
Professor Dr.-Ing. Nikolai Kornev
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：
2013
资助国家：
德国
起止时间：
2012-12-31 至 2016-12-31
项目状态：
已结题

来源：
https://gepris.dfg.de/gepris/projekt/247466387?language=en
关键词：
Development validation novel structure based

项目摘要

Aim of the research project is the development of a novel structure based method for artificial synthesis of turbulent velocity and scalar fields as well as the validation of this method. The project is based on previous works of the applicant, in which the turbulent velocity field at the inlet is generated with compact element which are carrier of either velocity (Turbulent spot method) or vorticity (Turbulent vortons method). An improvement of the method will be achieved by consideration of realistic anisotropic structures which appears especially in the wall region. The main point of the improvement is the procedure of synthesis of fluctuating fields with prescribed statistical properties up to moments of the second order (autocorrelations, spectra, integral lengths) with consideration of structure informations. The method is applied not only on velocity but also on scalar fields with consideration of multifractal properties of the scalar dissipation rate. The further aim is the extension of the method to compressible flows. The validation calculations will be performed for canonical flows of fluid mechanics and heat and mass transfer (channel, boundary layer, free shear flow and jet mixer). The result of this work will be a substantial improvement of methods for generation of inlet conditions for simulation of turbulent flows with consideration of anisotropic structures. At the end of the project, the special program routine for generation of inlet conditions will be available for all LES research groups.

研究项目的目的是开发一种新的基于结构的湍流速度场和标量场的人工合成方法，并对该方法进行验证。本课题是在申请人前人工作的基础上，采用以速度(湍斑法)或涡量(湍流涡量法)为载体的紧凑单元来模拟进口的湍流速度场。通过考虑真实的各向异性结构，特别是在壁面区域出现的各向异性结构，改进了该方法。改进的要点是在考虑结构信息的情况下，将具有规定统计特性的起伏场综合到二阶矩(自相关、谱、积分长度)。该方法不仅适用于速度场，而且还适用于标量场，同时考虑了标量耗散率的多重分形特性。进一步的目的是将该方法推广到可压缩流动。验证计算将对流体力学和热质传递(通道、边界层、自由剪切流和射流混合器)的正则流进行。这项工作的结果将是对考虑各向异性结构的湍流模拟的入口条件生成方法的实质性改进。在项目结束时，用于生成进气条件的特殊程序例程将可供所有LES研究小组使用。