PHENOMENOLOGICAL MODELING BASED ON THE MEASUREMENTS OF INSTANTANEOUS PRESSURE FIELD FOR PRESSURE-RELATED STATISTICS IN TURBULENT FLOWS OUT OF THE EQUILIBRIUM STATE
基于瞬时压力场测量的唯象模型,用于平衡态湍流中的压力相关统计
基本信息
- 批准号:15360100
- 负责人:
- 金额:$ 8.58万
- 依托单位:
- 依托单位国家:日本
- 项目类别:Grant-in-Aid for Scientific Research (B)
- 财政年份:2003
- 资助国家:日本
- 起止时间:2003 至 2005
- 项目状态:已结题
- 来源:
- 关键词:
项目摘要
The objectives of the study are to develop novel experimental techniques for the simultaneous measurements of fluctuating velocity an d pressure in turbulent flows, to assess the existing turbulence models in the Reynolds averaging framework, and to develop computational methods to predict complex turbulent flows associated with large-scale vortex structures. The project has been accordingly separated into several parts to cover these diverse purposes.The hybrid technique combining PIV measurement and computational approach has been developed to experimentally obtain the correlation between the fluctuating velocity and pressure. The velocity field obtained by PIV is substituted into the Poisson equation for the instantaneous pressure which is then solved by use of a finite-volume method at every instant. The evaluation of the correlation between the fluctuating velocity and pressure gradient fields has been possible. This method has been applied to turbulent flow around a pair of bluff … More bodies set in uniform flow in tandem. It is found that the over-proportionally strong velocity fluctuation is strongly correlated with the pressure fluctuation, and the currently existing turbulence models cannot represent the strong turbulent activities due to the lack of the appropriate model for the pressure-related statistics within the RANS framework. On the other hand, the measurement of velocity-pressure correlation by a miniature pressure sensor combined with an X-hot wire anemometer has indicated that the relatively simple model for pressure diffusion may not be applied to the region where the turbulent kinetic energy exhibits strong non-equilibrium state.Computational approach based on the discrete vortex method is considered as an alternative to the conventional RANS approach and to LES. The currently available methodology which is common in vortex method community has been examined and it is shown that some minor modification would be sufficient for the vortex methods to be applied to engineering turbulent flow computations. The application of the special purpose computer which is originally developed for the molecular dynamics simulations to vortex method calculation has shown an interesting direction of the future research.In summary, the dynamics of the turbulent flows associated with large-scale vortex motion is characterized by the strong correlation between the velocity and pressure fields. The turbulence modeling based on RANS should take into account the assessment of the models in complex turbulent flows out of energy equilibrium state. Less
该研究的目的是开发新的实验技术,同时测量湍流中的脉动速度和压力,以评估现有的湍流模型中的雷诺平均框架,并开发计算方法来预测与大尺度涡结构相关的复杂湍流。为了满足这些不同的目的,本项目被分成了几个部分,采用PIV测量和计算相结合的混合技术,通过实验获得了脉动速度和压力之间的相关性。将PIV测量得到的速度场代入泊松方程求解瞬时压力,然后用有限体积法求解瞬时压力。对脉动速度场和压力梯度场之间的相关性进行评价是可能的。该方法已应用于双海崖的湍流绕流 ...更多信息 一前一后的身体呈均匀流动。研究发现,超比例的强速度脉动与压力脉动有很强的相关性,而现有的湍流模型由于在RANS框架内缺乏合适的压力相关统计模型而不能代表强湍流活动。另一方面,用微型压力传感器结合X热线风速仪测量的速度-压力相关性表明,相对简单的压力扩散模型可能不适用于湍流动能表现出强烈非平衡状态的区域,基于离散涡方法的计算方法被认为是传统RANS方法和LES方法的替代方案。目前可用的方法,这是常见的涡方法社区已被检查,它表明,一些微小的修改将是足够的涡方法应用于工程湍流计算。将原本用于分子动力学模拟的专用计算机应用到涡方法计算中,显示了未来研究的一个有趣方向:与大尺度涡运动相关的湍流动力学的特征是速度场和压力场之间的强相关性。基于RANS的湍流模拟应考虑在非能量平衡的复杂湍流中对模型的评价。少
项目成果
期刊论文数量(38)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
专利数量(0)
Acceleration of vortex method calculation using MDGRAPE-2 : a special purpose computer
使用MDGRAPE-2加速涡流法计算:专用计算机
- DOI:
- 发表时间:2005
- 期刊:
- 影响因子:0
- 作者:Sheel;T.K.;Yasuoka;K.;Obi;S.
- 通讯作者:S.
Second-moment turbulence closure in prediction of channel flow with system rotation
系统旋转河道流量预测中的二阶矩湍流闭合
- DOI:
- 发表时间:2003
- 期刊:
- 影响因子:0
- 作者:Ichikawa;M.;Obi;S.;Masuda;S.
- 通讯作者:S.
PIVによる二箱桁間流れの乱流速度場計測
使用 PIV 测量两个箱梁之间的湍流速度场
- DOI:
- 发表时间:2004
- 期刊:
- 影响因子:0
- 作者:Minagawa;Y.;Obi;S.;小尾晋之介
- 通讯作者:小尾晋之介
Turbulent impinging jet onto a co-axial rotating disk
湍流撞击射流到同轴旋转盘上
- DOI:
- 发表时间:2003
- 期刊:
- 影响因子:0
- 作者:Minagawa;Y.;Obi;S.
- 通讯作者:S.
Experimental study on velocity-pressure correlation in turbulent mixing layer
湍流混合层速度-压力相关性实验研究
- DOI:
- 发表时间:2003
- 期刊:
- 影响因子:0
- 作者:Omori;T;Obi;S.;Masuda;S.
- 通讯作者:S.
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