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An effective method for comparing the turbulence intensity from LDA measurements and CFD predictions within a ship propeller jet

机译：一种比较LDA测量值和CFD预测值在船用螺旋桨喷气机中湍流强度的有效方法

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摘要

The mean velocity and turbulence intensity are the two main inputs to investigate the ship propeller induced seabed scouring resulting from a vessel is manoeuvring within a port where the underkeel clearances are low. More accurate data including the turbulence intensity is now available by using the laser doppler anemometry (LDA) measurement system and computational fluid dynamics (CFD) approach. Turbulence intensity has a loose definition, which is the velocity fluctuation as the root mean square (RMS) referenced to a mean flow velocity. However, the velocity fluctuation and mean velocity can be the overall value including x, y and z directions or the value of a single component. LDA and CFD results were obtained from two different acquisition systems (Dantec LDA system and Fluent CFD package) and therefore the outputs cannot be compared directly. An effective method is proposed for comparing the turbulence intensity between the experimental measurements and the computational predictions within a ship propeller jet. The flow patterns of turbulence intensity within a ship propeller jet are presented by using the LDA measurements and CFD results from turbulence models of standard k-ε, RNG k-ε, realizable k-ε, standard k-ω, SST k-ω and Reynolds stresses.
机译：平均速度和湍流强度是调查船用螺旋桨引起的海底冲刷的两个主要输入，该冲刷是由于船只在龙骨间隙较低的港口内操纵而引起的。现在，通过使用激光多普勒风速仪（LDA）测量系统和计算流体力学（CFD）方法，可以获得包括湍流强度在内的更准确的数据。湍流强度的定义较为松散，即相对于平均流速的均方根（RMS）的速度波动。但是，速度波动和平均速度可以是包括x，y和z方向的总值，也可以是单个分量的值。 LDA和CFD结果是从两个不同的采集系统（Dantec LDA系统和Fluent CFD软件包）获得的，因此无法直接比较输出。提出了一种有效的方法，用于比较船用螺旋桨喷气发动机内的实验测量值与计算预测值之间的湍流强度。通过使用LDA测量值和标准k-ε，RNGk-ε，可实现k-ε，标准k-ω，SSTk-ω和Sk的湍流模型的CFD结果，得出了船舶螺旋桨喷气机内湍流强度的流型。雷诺强调。

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  • 来源
    《Ocean Engineering》 |2012年第10期|p.105-124|共20页
  • 作者

    W.H. Lam; D.J. Robinson; G.A. Hamill; H.T.Johnston;

  • 作者单位

    Department of Civil Engineering, Faculty of Engineering, University of Malaya, 50603 Kuala Lumpur, Malaysia,School of Planning, Architecture and Civil Engineering, Queen's University Belfast, Northern Ireland, BT9 SAC, UK;

    School of Planning, Architecture and Civil Engineering, Queen's University Belfast, Northern Ireland, BT9 SAC, UK;

    School of Planning, Architecture and Civil Engineering, Queen's University Belfast, Northern Ireland, BT9 SAC, UK;

    School of Planning, Architecture and Civil Engineering, Queen's University Belfast, Northern Ireland, BT9 SAC, UK;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    ship propeller jet; turbulence intensity; user doppler anemometry; computational fluid dynamics; turbulence model; seabed scour;

    机译：船舶螺旋桨飞机湍流强度用户多普勒风速仪;计算流体动力学;湍流模型海底冲刷;

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