Experimental and numerical investigations on laminar-turbulent transition behind roughness with free-stream turbulence
自由流湍流粗糙度背后的层流-湍流转变的实验和数值研究
基本信息
- 批准号:423311937
- 负责人:
- 金额:--
- 依托单位:
- 依托单位国家:德国
- 项目类别:Research Grants
- 财政年份:2019
- 资助国家:德国
- 起止时间:2018-12-31 至 2022-12-31
- 项目状态:已结题
- 来源:
- 关键词:
项目摘要
The influence of roughness on the stability of boundary layers is a known but not yet fully understood problem in fluid mechanics. New theoretical methods can now calculate a global critical Reynolds number, but at the same time it was recognized that this does not correspond to the transition Reynolds number in the experiment. Background disturbances in the experiment were suspected as an explanation. Consequently, this also means that the transition Reynolds number depends on the degree of turbulence.The aim of this research project is to investigate the extent to which flow instabilities behind roughness elements in the boundary layer actually depend on free-stream turbulence. For this purpose, the transition Reynolds number is first determined in the undisturbed boundary layer. The degree of turbulence is then slowly increased, causing the transition Reynolds number to drop according to our expectations. This relationship is determined and tested for universality by parameter studies for different roughness diameters.These experiments are supported by direct numerical simulations to analyze phenomena in the global flow field and to better understand the underlying instability mechanisms. In addition, calculations using linear stability theory are performed by us or our cooperating colleagues and compared with the experiment and direct numerical simulations.The experimental and numerical results are of high scientific and practical relevance. On the one hand, we provide urgently needed experimental data, which are necessary for the further development of theoretical methods. To this end, we adapt our setups to the theoretical investigations. In addition, our experiments provide precise and robust data that can be used in practical applications with known turbulence levels.
粗糙度对边界层稳定性的影响是流体力学中一个已知但尚未完全理解的问题。 新的理论方法现在可以计算出一个整体的临界雷诺数,但同时也认识到,这并不对应于实验中的过渡雷诺数。实验中的背景干扰被怀疑是一种解释。 因此,这也意味着转捩雷诺数取决于湍流的程度。本研究项目的目的是研究边界层中粗糙元后面的流动不稳定性实际上在多大程度上取决于自由流湍流。 为此,首先在未扰动边界层中确定转捩雷诺数。 然后,湍流度缓慢增加,导致过渡雷诺数根据我们的预期下降。通过对不同粗糙度直径的参数研究,确定并检验了这种关系的普适性。这些实验得到了直接数值模拟的支持,以分析全球流场中的现象,并更好地理解潜在的不稳定机制。 此外,我们或我们的合作伙伴使用线性稳定性理论进行了计算,并与实验和直接数值模拟进行了比较,实验和数值结果具有很高的科学和实用价值。 一方面,我们提供了急需的实验数据,这是理论方法进一步发展所必需的。 为此,我们调整我们的设置的理论研究。此外,我们的实验提供了精确和可靠的数据,可用于已知湍流水平的实际应用中。
项目成果
期刊论文数量(0)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
专利数量(0)
数据更新时间:{{ journalArticles.updateTime }}
{{
item.title }}
{{ item.translation_title }}
- DOI:
{{ item.doi }} - 发表时间:
{{ item.publish_year }} - 期刊:
- 影响因子:{{ item.factor }}
- 作者:
{{ item.authors }} - 通讯作者:
{{ item.author }}
数据更新时间:{{ journalArticles.updateTime }}
{{ item.title }}
- 作者:
{{ item.author }}
数据更新时间:{{ monograph.updateTime }}
{{ item.title }}
- 作者:
{{ item.author }}
数据更新时间:{{ sciAawards.updateTime }}
{{ item.title }}
- 作者:
{{ item.author }}
数据更新时间:{{ conferencePapers.updateTime }}
{{ item.title }}
- 作者:
{{ item.author }}
数据更新时间:{{ patent.updateTime }}
Professor Dr.-Ing. Ulrich Rist其他文献
Professor Dr.-Ing. Ulrich Rist的其他文献
{{
item.title }}
{{ item.translation_title }}
- DOI:
{{ item.doi }} - 发表时间:
{{ item.publish_year }} - 期刊:
- 影响因子:{{ item.factor }}
- 作者:
{{ item.authors }} - 通讯作者:
{{ item.author }}
{{ truncateString('Professor Dr.-Ing. Ulrich Rist', 18)}}的其他基金
Numerical investigations of micro blowing in compressible turbulent boundary layers with zero and adverse pressure gradients in stream-wise direction
流向零压力梯度和逆压力梯度可压缩湍流边界层微吹的数值研究
- 批准号:
411492272 - 财政年份:2018
- 资助金额:
-- - 项目类别:
Research Grants
Numerical Investigations on the Use of Roughness Patterns for Boundary-Layer Flow Control
使用粗糙度模式进行边界层流动控制的数值研究
- 批准号:
322405353 - 财政年份:2017
- 资助金额:
-- - 项目类别:
Research Grants
Investigations of the origin of turbulent superstructures in a flat-plate boundary layer with pressure gradient
压力梯度平板边界层湍流上层结构的起源研究
- 批准号:
316161270 - 财政年份:2016
- 资助金额:
-- - 项目类别:
Priority Programmes
Investigations of cascaded micro-blowing for drag reduction in turbulent boundary layers
级联微吹在湍流边界层中减阻的研究
- 批准号:
246195626 - 财政年份:2015
- 资助金额:
-- - 项目类别:
Research Grants
Experimental investigations of critical roughness heights and roughness-induced laminar-turbulent transition in a laminar boundary layer
层流边界层中临界粗糙度高度和粗糙度引起的层流-湍流转变的实验研究
- 批准号:
250568929 - 财政年份:2014
- 资助金额:
-- - 项目类别:
Research Grants
Numerical investigations of laminar-turbulent transition control in compressible streamwise corner flows
可压缩流向角流层流-湍流转捩控制的数值研究
- 批准号:
252196516 - 财政年份:2014
- 资助金额:
-- - 项目类别:
Research Grants
Investigations of dynamics and structure generation in jet-in-crossflow con-figurations
射流横流配置中的动力学和结构生成研究
- 批准号:
186878845 - 财政年份:2010
- 资助金额:
-- - 项目类别:
Research Grants
Numerical investigations of laminar-turbulent transition in compressible streamwise corner flows
可压缩流向角流层流-湍流转变的数值研究
- 批准号:
109815617 - 财政年份:2009
- 资助金额:
-- - 项目类别:
Research Grants
Numerische Untersuchungen zur Wirbelbildung und Wirbeldynamik in Scherströmungen
剪切流中涡形成和涡动力学的数值研究
- 批准号:
65471885 - 财政年份:2008
- 资助金额:
-- - 项目类别:
Research Grants
Numerische Untersuchungen zur Laminarhaltung durch kontrollierte Wandschwingungen
通过受控壁振动进行层流稳定性的数值研究
- 批准号:
28136065 - 财政年份:2006
- 资助金额:
-- - 项目类别:
Priority Programmes
相似国自然基金
超声行波微流体驱动机理的试验研究
- 批准号:51075243
- 批准年份:2010
- 资助金额:39.0 万元
- 项目类别:面上项目
关于图像处理模型的目标函数构造及其数值方法研究
- 批准号:11071228
- 批准年份:2010
- 资助金额:32.0 万元
- 项目类别:面上项目
非管井集水建筑物取水机理的物理模拟及计算模型研究
- 批准号:40972154
- 批准年份:2009
- 资助金额:41.0 万元
- 项目类别:面上项目
孔隙介质中化学渗流溶解面非稳定性的理论分析与数值模拟实验研究
- 批准号:10872219
- 批准年份:2008
- 资助金额:35.0 万元
- 项目类别:面上项目
相似海外基金
Flow and fragmentation of melts and magmas: developing a unified view through experimental, numerical and field investigations.
熔体和岩浆的流动和破碎:通过实验、数值和现场研究形成统一的观点。
- 批准号:
MR/W009781/1 - 财政年份:2022
- 资助金额:
-- - 项目类别:
Fellowship
Experimental and numerical investigations of multiphase jets
多相射流的实验和数值研究
- 批准号:
RGPIN-2014-05704 - 财政年份:2021
- 资助金额:
-- - 项目类别:
Discovery Grants Program - Individual
Experimental and numerical investigations of multiphase jets
多相射流的实验和数值研究
- 批准号:
RGPIN-2014-05704 - 财政年份:2020
- 资助金额:
-- - 项目类别:
Discovery Grants Program - Individual
Numerical and experimental investigations of thermal riveting of polymeric materials
聚合物材料热铆接的数值和实验研究
- 批准号:
413515815 - 财政年份:2019
- 资助金额:
-- - 项目类别:
Research Grants
MoST-DFG Collaboration - Theoretical, numerical and experimental investigations of gravity-driven fluid-granular mixture flows
MoST-DFG 合作 - 重力驱动的流体-颗粒混合物流动的理论、数值和实验研究
- 批准号:
425259073 - 财政年份:2019
- 资助金额:
-- - 项目类别:
Research Grants
Experimental and numerical investigations on the effects of cavitation and flow-related collisions on aggregate formation and loss of activity after cell disruption in the high-pressure homogeniser using the model systems lipase or beta-lactoglobulin as e
使用模型系统脂肪酶或 β-乳球蛋白作为实验和数值研究,研究空化和流动相关碰撞对高压匀浆器中细胞破碎后聚集体形成和活性丧失的影响。
- 批准号:
425332181 - 财政年份:2019
- 资助金额:
-- - 项目类别:
Priority Programmes
Experimental and numerical investigations of factors influencing bone fracture tolerance
影响骨折耐受性因素的实验和数值研究
- 批准号:
402099-2013 - 财政年份:2019
- 资助金额:
-- - 项目类别:
Discovery Grants Program - Individual
Supersonic jet-pump vacuum generators: combined experimental and numerical investigations for performance improvement
超音速喷射泵真空发生器:结合实验和数值研究以提高性能
- 批准号:
531476-2018 - 财政年份:2019
- 资助金额:
-- - 项目类别:
Collaborative Research and Development Grants
Experimental and numerical investigations of multiphase jets
多相射流的实验和数值研究
- 批准号:
RGPIN-2014-05704 - 财政年份:2019
- 资助金额:
-- - 项目类别:
Discovery Grants Program - Individual
Numerical and experimental investigations on stress redistributions of fatigue loaded concrete structures in the very high-cycle fatigue range
超高周疲劳范围内疲劳荷载混凝土结构应力重新分布的数值和实验研究
- 批准号:
417209030 - 财政年份:2019
- 资助金额:
-- - 项目类别:
Research Grants