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

基本信息

项目摘要

In the present proposal investigations of new means for boundary-layer flow control are intended, based on small bristle-like hair structures attached to a wall in specific patterns. The main purpose of this proposal consists of obtaining knowledge about those wall patterns which are most usefully for technical applications.As already shown in preliminary work performed in DFG grant "Investigation of grid effects on surfaces covered with sensor hairs for selective detection of characteristic flow-field patterns (coincidence sensor)" thin hairs may significantly influence the local flow field. Despite this, we were able to show that the signal of an individual sensor is not inadmissibly falsified by this. Only if a second sensor is placed in the vicinity of another one, position-dependent variations of the second sensor's signal output appear which bear new and exciting application aspects. Results of our previous work on the flow around wall-mounted finite-length cylinders in single and tandem configuration will be used for validation of a new-to-implement modeling of bristle-like structures using body forces in the Navier-Stokes equations. After an additional validation for unsteady flow conditions, the numerical method will be used to perform direct numerical simulations based on the complete Navier-Stokes equations with modeled roughness elements. The distances between individual elements will be modified in such that their individual contributions intensify in the most appropriate way.An easily imaginable realization of this idea is an arrangement in rows parallel to the main flow direction with a certain distance between the rows and a certain length or height of the structures such that these hair structures exert a similar effect on the flow as already-known "riblets" in a turbulent boundary layer. Related questions will be studied in the present project using numerical investigations. However, the present approach is not restricted to riblets in turbulent flow, as other patterns for control of a boundary layer over a wall exist as well, like, e.g., so-called "zig-zag or pimple stripes" for provoking laminar-turbulent transition or delaying flow separation. For investigations of this problem, the impact of relevant roughness-element patterns on laminar-turbulent transition in a flat-plate boundary layer will be studied via numerical simulation. Results will be compared with data for critical Reynolds numbers found in literature. Additionally, the influence of roughness patterns on disturbance growth in a laminar boundary layer and hence on the transitions position will be quantified as well.
在本提案中,打算研究边界层流动控制的新方法,其基础是以特定图案附着在壁面上的小刚毛状毛发结构。 该建议的主要目的包括获得有关这些壁图案的知识,这是最有用的技术application.As已经显示在DFG赠款进行的初步工作“调查网格效应的表面覆盖传感器头发选择性检测的特征流场图案(符合传感器)”薄的头发可能会显着影响局部流场。 尽管如此,我们能够证明,单个传感器的信号并不是不可接受的伪造。 只有当第二传感器被放置在另一个传感器的附近时,第二传感器的信号输出的位置相关变化才会出现,这具有新的和令人兴奋的应用方面。 我们以前的工作的结果,在单个和串联配置的壁装有限长圆柱体周围的流动将用于验证一个新的实施建模的刚毛状结构使用体积力的Navier-Stokes方程。 在对非定常流条件进行额外验证后,将使用数值方法根据完整的Navier-Stokes方程和建模粗糙度元素进行直接数值模拟。 单个元件之间的距离将被修改,使得它们的单个贡献以最适当的方式增强。这个想法的一个容易想象的实现是平行于主流动方向的排布置,其中排之间具有一定的距离并且结构具有一定的长度或高度,使得这些毛发结构对流动施加与已知的“肋”类似的效果。在湍流边界层中。 相关问题将在本项目中使用数值调查进行研究。 然而,本方法不限于湍流中的沟槽,因为还存在用于控制壁上方的边界层的其他图案,例如,所谓的“锯齿或疙瘩条纹”,用于引起层流-湍流过渡或延迟流动分离。 为了研究这一问题,将通过数值模拟研究相关粗糙元模式对平板边界层中层流-湍流转捩的影响。 结果将与文献中的临界雷诺数数据进行比较。 此外,粗糙度模式对层流边界层中的扰动增长的影响,从而对过渡位置也将被量化。

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

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
  • 批准号:
    423311937
  • 财政年份:
    2019
  • 资助金额:
    --
  • 项目类别:
    Research Grants
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
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

相似海外基金

Novel application of pharmaceutical AMD3100 to reduce risk in opioid use disorder: investigations of a causal relationship between CXCR4 expression and addiction vulnerability
药物 AMD3100 降低阿片类药物使用障碍风险的新应用:CXCR4 表达与成瘾脆弱性之间因果关系的研究
  • 批准号:
    10678062
  • 财政年份:
    2023
  • 资助金额:
    --
  • 项目类别:
Personal Health Information Software Platform - Data Exposure and Referential Integrity Investigations for Electronic Medical Record Integration Development for Seamless Hospital Use
个人健康信息软件平台 - 电子病历集成开发的数据暴露和参照完整性调查,供医院无缝使用
  • 批准号:
    CCARD-2022-00063
  • 财政年份:
    2022
  • 资助金额:
    --
  • 项目类别:
    CCI Applied Research and Development Grants
Antibiotic Use and Asthma Incidence: Population Based Retrospective Cohort Investigations in BC and Manitoba.
抗生素使用和哮喘发病率:不列颠哥伦比亚省和马尼托巴省基于人群的回顾性队列调查。
  • 批准号:
    445550
  • 财政年份:
    2021
  • 资助金额:
    --
  • 项目类别:
    Operating Grants
NIAAA Medications Development Clinical Investigations Network for the Treatment of Alcohol Use Disorder
NIAAA 治疗酒精使用障碍药物开发临床研究网络
  • 批准号:
    10506094
  • 财政年份:
    2021
  • 资助金额:
    --
  • 项目类别:
NIAAA Medications Development Clinical Investigations Network for the Treatment of Alcohol Use Disorder
NIAAA 治疗酒精使用障碍药物开发临床研究网络
  • 批准号:
    10506113
  • 财政年份:
    2021
  • 资助金额:
    --
  • 项目类别:
NIAAA Medications Development Clinical Investigations Network for the Treatment of Alcohol Use Disorder
NIAAA 治疗酒精使用障碍药物开发临床研究网络
  • 批准号:
    10506126
  • 财政年份:
    2021
  • 资助金额:
    --
  • 项目类别:
NIAAA Medications Development Clinical Investigations Network for the Treatment of Alcohol Use Disorder
NIAAA 治疗酒精使用障碍药物开发临床研究网络
  • 批准号:
    10591396
  • 财政年份:
    2021
  • 资助金额:
    --
  • 项目类别:
NIAAA Medications Development Clinical Investigations Network for the Treatment of Alcohol Use Disorder
NIAAA 治疗酒精使用障碍药物开发临床研究网络
  • 批准号:
    10591388
  • 财政年份:
    2021
  • 资助金额:
    --
  • 项目类别:
NIAAA Medications Development Clinical Investigations Network for the Treatment of Alcohol Use Disorder
NIAAA 治疗酒精使用障碍药物开发临床研究网络
  • 批准号:
    10506088
  • 财政年份:
    2021
  • 资助金额:
    --
  • 项目类别:
NIAAA Medications Development Clinical Investigations Network for the Treatment of Alcohol Use Disorder
NIAAA 治疗酒精使用障碍药物开发临床研究网络
  • 批准号:
    10506092
  • 财政年份:
    2021
  • 资助金额:
    --
  • 项目类别:
{{ showInfoDetail.title }}

作者:{{ showInfoDetail.author }}

知道了