Isotropic Turbulent(各向同性湍流)研究综述
Isotropic Turbulent 各向同性湍流 - What makes this model different is that it can describe strongly anisotropic turbulent flows; moreover, it is easy to implement numerically while not being computationally expensive. [1] We investigate the dynamics of turbulent dispersion by means of direct numerical simulations of a passive tracer released in a homogeneous isotropic turbulent flow. [2] The physical mechanisms underlying the dynamics of the flame kernel in stationary isotropic and anisotropic turbulent field are studied using large eddy simulations (LES) combined with a pdf approach method for the combustion model closure. [3] In this study, we investigate interscale kinetic energy transfer and subgrid-scale (SGS) backscatter using data from direct numerical simulations (DNSs) of premixed isotropic turbulent flames. [4] A distribution of Hill’s vortices is used to synthesize an anisotropic turbulent velocity field that satisfies the incompressibility condition and match a given Reynolds stress tensor. [5] A method for the numerical generation of anisotropic turbulent velocity fields is presented. [6] To enable an analysis uncomplicated by the presence of many coupled interactions, we confine our attention to the classic test case of monodisperse particles in homogeneous, isotropic turbulent flows, and subject to a uniform gravitational field. [7] Kinematic dynamo in incompressible isotropic turbulent flows with high magnetic Prandtl number is considered. [8] Generally, the theory correctly predicts the measured log-amplitude variances, which are affected primarily by small-scale, isotropic turbulent eddies. [9] Multi-wave band synchrotron linear polarization of gamma-ray burst (GRB) afterglows is studied under the assumption of an anisotropic turbulent magnetic field with a coherence length of the plasma skin-depth scale in the downstream of forward shocks. [10] On the base of Randomized Spectral Method (RSM), a new stochastic algorithm for the generation of homogeneous anisotropic turbulent velocity fields has been developed. [11] 1 library, we study the flow of particles inside a highly anisotropic turbulent flow field of a hydrocyclone. [12] In this work, a numerical study of the dynamical behavior of unsteady and anisotropic turbulent flow downstream a 90° bended pipe was presented. [13] We first consider the Kraichnan model, in which the turbulent carrier flow is modeled by a stochastic vector field with a Gaussian distribution, and then a scalar advected by a homogeneous and isotropic turbulent flow described by the Navier-Stokes equation, under the assumption that the scalar is passive, i. [14] One direction of research is to investigate anisotropic turbulence intensities, id est to investigate the distribution of Reynolds stresses and energy spectra in a square cross-section channel, downstream of a semi-active jet turbulence grid generating anisotropic turbulent airflow. [15] The 3D PTV and particle identification algorithms show good consistencies under two types of flow conditions: a homogeneous isotropic turbulent flow and a vortex ring flow. [16] In this paper we study finite particle Reynolds number effects up to $Re_p=50$ on the dynamics of small spherical bubbles and solid particles in an isotropic turbulent flow. [17] In addition, the work also consists of implementing an appropriate turbulence model, to ensure a better analysis of free, homogeneous isotropic turbulent flows. [18] We characterize the mass transfer of dilute gases from a single bubble in a homogeneous isotropic turbulent flow in the limit of negligible bubble volume variations. [19] The Reynolds stress data showed an anisotropic turbulent flow immediately downstream of the roller toe, and tended towards isotropy away from the roller toe. [20] Herein, we investigate the topology of the local flow in vaporizing forced homogeneous isotropic turbulent two-phase flows. [21] We investigate the modes of deformation of an initially spherical bubble immersed in a homogeneous and isotropic turbulent background flow. [22] Many flow configurations in nature and in the laboratories deviate from the ideal homogeneous and isotropic turbulent cases (HIT) characterised by the presence of direct energy cascade only and strong small-scales universality. [23] In this strongly anisotropic situation, despite the additional roughness induced by the canopy, it is shown that fluctuations of Lagrangian velocity increments over small time scales display very similar behaviour as those observed in homogeneous and isotropic turbulent flows. [24] Vortices motion in the anisotropic turbulent flow of cyclones makes a vital impact on flow stability and collection performance. [25] The covariance structure of a homogeneous isotropic turbulent wind velocity field is derived in terms of modified Bessel functions for an extended form of the Kàrmàn velocity spectrum, including explicit expressions for the transverse coherence functions. [26] Two non-trivial turbulent flow problems, a fully developed turbulent pipe flow at a low Reynolds number, and a decaying homogeneous isotropic turbulent flow laden with a large number of resolved spherical particles are considered. [27] The method is demonstrated for a canonical Burgers vortex, a Bodewadt vortex, homogeneous isotropic turbulent flow, the wake of a propeller, a heaving plate, a turning containership and the airwake of a surface combatant. [28] A stochastic method basing on turbulence statistics is proposed to generate anisotropic turbulent fluctuations and track particles motion separately. [29] The effects of aggregating particles of different volume fractions on the statistically stationary homogeneous isotropic turbulent flow were investigated. [30] We also show that the helicity of oblique fluctuations has little dependence on proton temperature anisotropy and is consistent with kinetic Alfven wave-like fluctuations from the anisotropic turbulent cascade. [31] Finally, the introduced model undergoes \textit{a priori} evaluations based on the direct numerical simulation database of forced and decaying homogeneous isotropic turbulent flows at relatively high and moderate Reynolds numbers, respectively. [32] Acoustic results for homogeneous isotropic turbulent flow are calculated by integrating the single-gust solution over a wavenumber spectrum. [33] In this study, an anisotropic turbulent mixing model with a turbulent mixing coefficient matrix is developed and embedded in an in-house code to analyze the thermal-hydraulic performance of the fuel assembly. [34] Validation of the GRM method is carried out by generating and simulating a decaying homogeneous isotropic turbulent flow. [35] The PDF model with an isotropic turbulent diffusivity performed inadequately for the tangential and axial velocity components. [36] The alignment between strain and mixture fraction gradient differs slightly from the homogeneous isotropic turbulent case but agree remarkably well with previous results observed in homogeneous shear incompressible flows. [37] In the wall-normal direction, particle distributions (mean/preferential concentration) exhibit two distinct behaviours in the inner flow and outer flow, corresponding to two highly anisotropic turbulent structures, LSMs and VLSMs. [38] This review devoted to the theoretical analysis, calculation, and modeling of the processes of merging and breakage of droplets and bubbles in an isotropic turbulent flow. [39] This Rapid Communication presents an advanced method to model isotropic turbulent inflow conditions for a two-dimensional vortex particle method. [40] A decaying 2D homogeneous and isotropic turbulent flow is considered in the self-similar limit, which is achieved with large values of the Reynolds number formed using the time and kinetic energy of the flow if the initial value of the averaged enstrophy tends to infinity with the viscosity tending to zero. [41] We develop an adversarial-reinforcement learning scheme for microswimmers in statistically homogeneous and isotropic turbulent fluid flows, in both two (2D) and three dimensions (3D). [42] EnglishBy using an active grid and a passive grid, a homogenous and isotropic turbulent flow was characterized by studying its longitudinal structure functions and transverse 〉 and where u is the longitudinal velocity fluctuation, and v is the fluctuation of the transverse velocity, as a function of the Reynolds number for orders, n, between 2 and 8. [43] By the spectrum average coherence length and the spectrum average mutual coherence function, we construct a received probability of vortex modes carried by localized wave of Bessel–Gaussian amplitude envelope in anisotropic turbulent seawater. [44] The mixing layer growth rate and the mixing efficiency both show reduction by increasing the initial magnetic field intensity, which is attributed to the reduction of the averaged Reynolds number of both homogenous isotropic turbulent regions due to the suppressing effect of the Lorentz force on the velocity fields of these regions. [45] We propose a model for the acceleration of micro-bubbles (smaller than the dissipative scale of the flow) subjected to the drag and fluid inertia forces in a homogeneous and isotropic turbulent flow. [46] We also find that the helicity of oblique fluctuations has little dependence on proton temperature anisotropy and is consistent with fluctuations from the anisotropic turbulent cascade. [47] A decaying 2D homogeneous and isotropic turbulent flow is considered in the self-similar limit, which is achieved with large values of the Reynolds number formed using the time and kinetic energy of the flow if the initial value of the averaged enstrophy tends to infinity with the viscosity tending to zero. [48] Homogeneous and isotropic turbulent fields obtained from two DNS databases (with $\mbox{Re}_\lambda$ equal to 150 and 418) were seeded with point particles that moved with the local fluid velocity to obtain Lagrangian pressure histories. [49] ABSTRACT In this paper, we study the correlation functions for magnetic energy and magnetic helicity generated by a small-scale dynamo mechanism in a mirror-asymmetric and isotropic turbulent conductive fluid. [50]该模型的不同之处在于它可以描述强烈的各向异性湍流；此外，它很容易在数值上实现，同时计算量也不大。 [1] 我们通过在均匀各向同性湍流中释放的被动示踪剂的直接数值模拟来研究湍流分散的动力学。 [2] 使用大涡模拟 (LES) 结合燃烧模型闭合的 pdf 方法，研究了静止各向同性和各向异性湍流场中火焰内核动力学的物理机制。 [3] 在这项研究中，我们使用来自预混合各向同性湍流火焰的直接数值模拟 (DNS) 的数据研究了尺度间动能传递和亚网格尺度 (SGS) 反向散射。 [4] 希尔涡流的分布用于合成满足不可压缩条件并匹配给定雷诺应力张量的各向异性湍流速度场。 [5] 提出了一种数值生成各向异性湍流速度场的方法。 [6] 为了使分析不因存在许多耦合相互作用而变得复杂，我们将注意力集中在均匀、各向同性湍流中单分散粒子的经典测试案例，并受到均匀引力场的影响。 [7] 考虑了高磁普朗特数不可压缩各向同性湍流中的运动发电机。 [8] 通常，该理论正确地预测了测量的对数幅度方差，这些方差主要受小规模的各向同性湍流涡流的影响。 [9] 假设前激波下游具有等离子趋肤深度尺度相干长度的各向异性湍流磁场，研究了伽马射线暴（GRB）余辉的多波段同步加速器线偏振。 [10] 在随机谱法（RSM）的基础上，开发了一种新的随机生成均匀各向异性湍流速度场的算法。 [11] 在 1 库中，我们研究了水力旋流器高度各向异性湍流场内的粒子流动。 [12] 在这项工作中，对 90° 弯管下游的不稳定和各向异性湍流的动力学行为进行了数值研究。 [13] 我们首先考虑 Kraichnan 模型，其中湍流载流由具有高斯分布的随机矢量场建模，然后是由 Navier-Stokes 方程描述的均匀和各向同性湍流平流的标量，假设标量是被动的，i。 [14] 一个研究方向是研究各向异性湍流强度，最好是研究一个方形横截面通道中雷诺应力和能谱的分布，该通道位于产生各向异性湍流气流的半主动射流湍流网格的下游。 [15] 3D PTV 和粒子识别算法在两种流动条件下表现出良好的一致性：均质各向同性湍流和涡环流。 [16] 在本文中，我们研究了高达 $Re_p=50$ 的有限粒子雷诺数对各向同性湍流中小球形气泡和固体粒子动力学的影响。 [17] 此外，这项工作还包括实施适当的湍流模型，以确保更好地分析自由、均匀的各向同性湍流。 [18] 我们描述了在可忽略气泡体积变化的限制下，均匀各向同性湍流中单个气泡中稀薄气体的传质。 [19] Reynolds 应力数据显示了紧邻滚趾下游的各向异性湍流，并且趋向于远离滚趾的各向同性。 [20] 在这里，我们研究了汽化强制均匀各向同性湍流两相流中局部流动的拓扑结构。 [21] 我们研究了浸入均匀和各向同性湍流背景流中的初始球形气泡的变形模式。 [22] 自然界和实验室中的许多流动配置都偏离了理想的均质和各向同性湍流情况 (HIT)，其特征是仅存在直接能量级联和强大的小尺度普遍性。 [23] 在这种强烈的各向异性情况下，尽管冠层引起了额外的粗糙度，但表明拉格朗日速度增量在小时间尺度上的波动表现出与在均匀和各向同性湍流中观察到的非常相似的行为。 [24] 旋风分离器各向异性湍流中的涡流运动对流动稳定性和收集性能产生重大影响。 [25] 均质各向同性湍流风速场的协方差结构是根据 Kàrmàn 速度谱的扩展形式的修正贝塞尔函数导出的，包括横向相干函数的显式表达式。 [26] 考虑了两个非平凡的湍流问题，一个在低雷诺数下充分发展的湍流管流，以及一个带有大量已解析球形粒子的衰减均匀各向同性湍流。 [27] 该方法针对典型的 Burgers 涡流、Bodewadt 涡流、均匀各向同性湍流、螺旋桨尾流、起伏板、转向集装箱船和水面战舰的空气尾流进行了演示。 [28] 提出了一种基于湍流统计的随机方法来生成各向异性湍流波动并分别跟踪粒子运动。 [29] 研究了不同体积分数的聚集颗粒对统计平稳均匀各向同性湍流的影响。 [30] 我们还表明，倾斜波动的螺旋性对质子温度各向异性的依赖性很小，并且与来自各向异性湍流级联的动力学 Alfven 波状波动一致。 [31] 最后，引入的模型分别在相对较高和中等雷诺数的受迫和衰减均匀各向同性湍流的直接数值模拟数据库的基础上进行了 \textit{a priori} 评估。 [32] 均匀各向同性湍流的声学结果是通过在波数谱上积分单阵风解来计算的。 [33] 在这项研究中，开发了具有湍流混合系数矩阵的各向异性湍流混合模型并将其嵌入到内部代码中，以分析燃料组件的热工水力性能。 [34] 通过生成和模拟衰减的均匀各向同性湍流来验证 GRM 方法。 [35] 具有各向同性湍流扩散率的 PDF 模型在切向和轴向速度分量上表现不佳。 [36] 应变和混合分数梯度之间的对齐与均匀各向同性湍流情况略有不同，但与之前在均匀剪切不可压缩流动中观察到的结果非常吻合。 [37] 在壁面法线方向上，粒子分布（平均/优先浓度）在内流和外流中表现出两种不同的行为，对应于两种高度各向异性的湍流结构，LSM 和 VLSM。 [38] 这篇综述致力于对各向同性湍流中液滴和气泡的合并和破裂过程进行理论分析、计算和建模。 [39] 这种快速通信提出了一种先进的方法来模拟二维涡旋粒子方法的各向同性湍流流入条件。 [40] 在自相似极限中考虑衰减的二维均匀和各向同性湍流，如果平均熵的初始值随粘度趋于零。 [41] 我们在二维 (2D) 和三维 (3D) 中为统计均匀和各向同性的湍流流体流中的微型游泳者开发了一种对抗性强化学习方案。 [42] Chinese通过使用主动网格和被动网格，通过研究其纵向结构函数和横向>来表征均质和各向同性湍流，其中u是纵向速度波动，v是横向速度波动，作为函数阶数 n 的雷诺数，介于 2 和 8 之间。 [43] 通过谱平均相干长度和谱平均互相干函数，我们构造了各向异性湍流海水中贝塞尔-高斯振幅包络的局域波所携带的涡模的接收概率。 [44] 混合层生长速率和混合效率均随着初始磁场强度的增加而降低，这归因于洛伦兹力对速度场的抑制作用导致两个均匀各向同性湍流区域的平均雷诺数降低这些地区的。 [45] 我们提出了一个模型，用于在均匀和各向同性的湍流中受到阻力和流体惯性力的微气泡（小于流动的耗散尺度）的加速度。 [46] 我们还发现斜涨落的螺旋性对质子温度各向异性的依赖性很小，并且与各向异性湍流级联的涨落一致。 [47] 在自相似极限中考虑衰减的二维均匀和各向同性湍流，如果平均熵的初始值随粘度趋于零。 [48] 从两个 DNS 数据库（$\mbox{Re}_\lambda$ 等于 150 和 418）获得的均质和各向同性湍流场被播种为随局部流体速度移动的点粒子，以获得拉格朗日压力历史。 [49] 摘要 在本文中，我们研究了在镜像非对称和各向同性湍流导电流体中由小型发电机机构产生的磁能和磁螺旋度的相关函数。 [50]
Homogeneou Isotropic Turbulent 均匀各向同性湍流
We investigate the dynamics of turbulent dispersion by means of direct numerical simulations of a passive tracer released in a homogeneous isotropic turbulent flow. [1] The 3D PTV and particle identification algorithms show good consistencies under two types of flow conditions: a homogeneous isotropic turbulent flow and a vortex ring flow. [2] In addition, the work also consists of implementing an appropriate turbulence model, to ensure a better analysis of free, homogeneous isotropic turbulent flows. [3] We characterize the mass transfer of dilute gases from a single bubble in a homogeneous isotropic turbulent flow in the limit of negligible bubble volume variations. [4] Herein, we investigate the topology of the local flow in vaporizing forced homogeneous isotropic turbulent two-phase flows. [5] The covariance structure of a homogeneous isotropic turbulent wind velocity field is derived in terms of modified Bessel functions for an extended form of the Kàrmàn velocity spectrum, including explicit expressions for the transverse coherence functions. [6] Two non-trivial turbulent flow problems, a fully developed turbulent pipe flow at a low Reynolds number, and a decaying homogeneous isotropic turbulent flow laden with a large number of resolved spherical particles are considered. [7] The method is demonstrated for a canonical Burgers vortex, a Bodewadt vortex, homogeneous isotropic turbulent flow, the wake of a propeller, a heaving plate, a turning containership and the airwake of a surface combatant. [8] The effects of aggregating particles of different volume fractions on the statistically stationary homogeneous isotropic turbulent flow were investigated. [9] Finally, the introduced model undergoes \textit{a priori} evaluations based on the direct numerical simulation database of forced and decaying homogeneous isotropic turbulent flows at relatively high and moderate Reynolds numbers, respectively. [10] Acoustic results for homogeneous isotropic turbulent flow are calculated by integrating the single-gust solution over a wavenumber spectrum. [11] Validation of the GRM method is carried out by generating and simulating a decaying homogeneous isotropic turbulent flow. [12] The alignment between strain and mixture fraction gradient differs slightly from the homogeneous isotropic turbulent case but agree remarkably well with previous results observed in homogeneous shear incompressible flows. [13] In this work, the Lyapunov spectrum of forced homogeneous isotropic turbulent flows is computed. [14]我们通过在均匀各向同性湍流中释放的被动示踪剂的直接数值模拟来研究湍流分散的动力学。 [1] 3D PTV 和粒子识别算法在两种流动条件下表现出良好的一致性：均质各向同性湍流和涡环流。 [2] 此外，这项工作还包括实施适当的湍流模型，以确保更好地分析自由、均匀的各向同性湍流。 [3] 我们描述了在可忽略气泡体积变化的限制下，均匀各向同性湍流中单个气泡中稀薄气体的传质。 [4] 在这里，我们研究了汽化强制均匀各向同性湍流两相流中局部流动的拓扑结构。 [5] 均质各向同性湍流风速场的协方差结构是根据 Kàrmàn 速度谱的扩展形式的修正贝塞尔函数导出的，包括横向相干函数的显式表达式。 [6] 考虑了两个非平凡的湍流问题，一个在低雷诺数下充分发展的湍流管流，以及一个带有大量已解析球形粒子的衰减均匀各向同性湍流。 [7] 该方法针对典型的 Burgers 涡流、Bodewadt 涡流、均匀各向同性湍流、螺旋桨尾流、起伏板、转向集装箱船和水面战舰的空气尾流进行了演示。 [8] 研究了不同体积分数的聚集颗粒对统计平稳均匀各向同性湍流的影响。 [9] 最后，引入的模型分别在相对较高和中等雷诺数的受迫和衰减均匀各向同性湍流的直接数值模拟数据库的基础上进行了 \textit{a priori} 评估。 [10] 均匀各向同性湍流的声学结果是通过在波数谱上积分单阵风解来计算的。 [11] 通过生成和模拟衰减的均匀各向同性湍流来验证 GRM 方法。 [12] 应变和混合分数梯度之间的对齐与均匀各向同性湍流情况略有不同，但与之前在均匀剪切不可压缩流动中观察到的结果非常吻合。 [13] 在这项工作中，计算了强制均匀各向同性湍流的 Lyapunov 谱。 [14]
isotropic turbulent flow 各向同性湍流
What makes this model different is that it can describe strongly anisotropic turbulent flows; moreover, it is easy to implement numerically while not being computationally expensive. [1] We investigate the dynamics of turbulent dispersion by means of direct numerical simulations of a passive tracer released in a homogeneous isotropic turbulent flow. [2] To enable an analysis uncomplicated by the presence of many coupled interactions, we confine our attention to the classic test case of monodisperse particles in homogeneous, isotropic turbulent flows, and subject to a uniform gravitational field. [3] Kinematic dynamo in incompressible isotropic turbulent flows with high magnetic Prandtl number is considered. [4] 1 library, we study the flow of particles inside a highly anisotropic turbulent flow field of a hydrocyclone. [5] In this work, a numerical study of the dynamical behavior of unsteady and anisotropic turbulent flow downstream a 90° bended pipe was presented. [6] We first consider the Kraichnan model, in which the turbulent carrier flow is modeled by a stochastic vector field with a Gaussian distribution, and then a scalar advected by a homogeneous and isotropic turbulent flow described by the Navier-Stokes equation, under the assumption that the scalar is passive, i. [7] The 3D PTV and particle identification algorithms show good consistencies under two types of flow conditions: a homogeneous isotropic turbulent flow and a vortex ring flow. [8] In this paper we study finite particle Reynolds number effects up to $Re_p=50$ on the dynamics of small spherical bubbles and solid particles in an isotropic turbulent flow. [9] In addition, the work also consists of implementing an appropriate turbulence model, to ensure a better analysis of free, homogeneous isotropic turbulent flows. [10] We characterize the mass transfer of dilute gases from a single bubble in a homogeneous isotropic turbulent flow in the limit of negligible bubble volume variations. [11] The Reynolds stress data showed an anisotropic turbulent flow immediately downstream of the roller toe, and tended towards isotropy away from the roller toe. [12] In this strongly anisotropic situation, despite the additional roughness induced by the canopy, it is shown that fluctuations of Lagrangian velocity increments over small time scales display very similar behaviour as those observed in homogeneous and isotropic turbulent flows. [13] Vortices motion in the anisotropic turbulent flow of cyclones makes a vital impact on flow stability and collection performance. [14] Two non-trivial turbulent flow problems, a fully developed turbulent pipe flow at a low Reynolds number, and a decaying homogeneous isotropic turbulent flow laden with a large number of resolved spherical particles are considered. [15] The method is demonstrated for a canonical Burgers vortex, a Bodewadt vortex, homogeneous isotropic turbulent flow, the wake of a propeller, a heaving plate, a turning containership and the airwake of a surface combatant. [16] The effects of aggregating particles of different volume fractions on the statistically stationary homogeneous isotropic turbulent flow were investigated. [17] Finally, the introduced model undergoes \textit{a priori} evaluations based on the direct numerical simulation database of forced and decaying homogeneous isotropic turbulent flows at relatively high and moderate Reynolds numbers, respectively. [18] Acoustic results for homogeneous isotropic turbulent flow are calculated by integrating the single-gust solution over a wavenumber spectrum. [19] Validation of the GRM method is carried out by generating and simulating a decaying homogeneous isotropic turbulent flow. [20] This review devoted to the theoretical analysis, calculation, and modeling of the processes of merging and breakage of droplets and bubbles in an isotropic turbulent flow. [21] A decaying 2D homogeneous and isotropic turbulent flow is considered in the self-similar limit, which is achieved with large values of the Reynolds number formed using the time and kinetic energy of the flow if the initial value of the averaged enstrophy tends to infinity with the viscosity tending to zero. [22] EnglishBy using an active grid and a passive grid, a homogenous and isotropic turbulent flow was characterized by studying its longitudinal structure functions and transverse 〉 and where u is the longitudinal velocity fluctuation, and v is the fluctuation of the transverse velocity, as a function of the Reynolds number for orders, n, between 2 and 8. [23] We propose a model for the acceleration of micro-bubbles (smaller than the dissipative scale of the flow) subjected to the drag and fluid inertia forces in a homogeneous and isotropic turbulent flow. [24] A decaying 2D homogeneous and isotropic turbulent flow is considered in the self-similar limit, which is achieved with large values of the Reynolds number formed using the time and kinetic energy of the flow if the initial value of the averaged enstrophy tends to infinity with the viscosity tending to zero. [25] An artificial neural network (ANN) is used to establish the relation between the resolved-scale flow field and the subgrid-scale (SGS) stress tensor, to develop a new SGS model for large-eddy simulation (LES) of isotropic turbulent flows. [26] In this work, the Lyapunov spectrum of forced homogeneous isotropic turbulent flows is computed. [27] To validate this approach, it was applied to an experimental homogeneous and isotropic turbulent flow (HIT), perturbed by a synthetic Lamb–Oseen vortex that mimics the feature of organized motion. [28]该模型的不同之处在于它可以描述强烈的各向异性湍流；此外，它很容易在数值上实现，同时计算量也不大。 [1] 我们通过在均匀各向同性湍流中释放的被动示踪剂的直接数值模拟来研究湍流分散的动力学。 [2] 为了使分析不因存在许多耦合相互作用而变得复杂，我们将注意力集中在均匀、各向同性湍流中单分散粒子的经典测试案例，并受到均匀引力场的影响。 [3] 考虑了高磁普朗特数不可压缩各向同性湍流中的运动发电机。 [4] 在 1 库中，我们研究了水力旋流器高度各向异性湍流场内的粒子流动。 [5] 在这项工作中，对 90° 弯管下游的不稳定和各向异性湍流的动力学行为进行了数值研究。 [6] 我们首先考虑 Kraichnan 模型，其中湍流载流由具有高斯分布的随机矢量场建模，然后是由 Navier-Stokes 方程描述的均匀和各向同性湍流平流的标量，假设标量是被动的，i。 [7] 3D PTV 和粒子识别算法在两种流动条件下表现出良好的一致性：均质各向同性湍流和涡环流。 [8] 在本文中，我们研究了高达 $Re_p=50$ 的有限粒子雷诺数对各向同性湍流中小球形气泡和固体粒子动力学的影响。 [9] 此外，这项工作还包括实施适当的湍流模型，以确保更好地分析自由、均匀的各向同性湍流。 [10] 我们描述了在可忽略气泡体积变化的限制下，均匀各向同性湍流中单个气泡中稀薄气体的传质。 [11] Reynolds 应力数据显示了紧邻滚趾下游的各向异性湍流，并且趋向于远离滚趾的各向同性。 [12] 在这种强烈的各向异性情况下，尽管冠层引起了额外的粗糙度，但表明拉格朗日速度增量在小时间尺度上的波动表现出与在均匀和各向同性湍流中观察到的非常相似的行为。 [13] 旋风分离器各向异性湍流中的涡流运动对流动稳定性和收集性能产生重大影响。 [14] 考虑了两个非平凡的湍流问题，一个在低雷诺数下充分发展的湍流管流，以及一个带有大量已解析球形粒子的衰减均匀各向同性湍流。 [15] 该方法针对典型的 Burgers 涡流、Bodewadt 涡流、均匀各向同性湍流、螺旋桨尾流、起伏板、转向集装箱船和水面战舰的空气尾流进行了演示。 [16] 研究了不同体积分数的聚集颗粒对统计平稳均匀各向同性湍流的影响。 [17] 最后，引入的模型分别在相对较高和中等雷诺数的受迫和衰减均匀各向同性湍流的直接数值模拟数据库的基础上进行了 \textit{a priori} 评估。 [18] 均匀各向同性湍流的声学结果是通过在波数谱上积分单阵风解来计算的。 [19] 通过生成和模拟衰减的均匀各向同性湍流来验证 GRM 方法。 [20] 这篇综述致力于对各向同性湍流中液滴和气泡的合并和破裂过程进行理论分析、计算和建模。 [21] 在自相似极限中考虑衰减的二维均匀和各向同性湍流，如果平均熵的初始值随粘度趋于零。 [22] Chinese通过使用主动网格和被动网格，通过研究其纵向结构函数和横向>来表征均质和各向同性湍流，其中u是纵向速度波动，v是横向速度波动，作为函数阶数 n 的雷诺数，介于 2 和 8 之间。 [23] 我们提出了一个模型，用于在均匀和各向同性的湍流中受到阻力和流体惯性力的微气泡（小于流动的耗散尺度）的加速度。 [24] 在自相似极限中考虑衰减的二维均匀和各向同性湍流，如果平均熵的初始值随粘度趋于零。 [25] 使用人工神经网络 (ANN) 建立解析尺度流场与亚网格尺度 (SGS) 应力张量之间的关系，以开发用于各向同性湍流大涡模拟 (LES) 的新 SGS 模型。 [26] 在这项工作中，计算了强制均匀各向同性湍流的 Lyapunov 谱。 [27] 为了验证这种方法，它被应用于实验性的均匀和各向同性湍流 (HIT)，受到模拟有组织运动特征的合成 Lamb-Oseen 涡流的扰动。 [28]
isotropic turbulent field
The physical mechanisms underlying the dynamics of the flame kernel in stationary isotropic and anisotropic turbulent field are studied using large eddy simulations (LES) combined with a pdf approach method for the combustion model closure. [1] Homogeneous and isotropic turbulent fields obtained from two DNS databases (with $\mbox{Re}_\lambda$ equal to 150 and 418) were seeded with point particles that moved with the local fluid velocity to obtain Lagrangian pressure histories. [2] The difference in pitch angle of the regular and the ordered fields indicates that the ordered field contains a significant fraction of an anisotropic turbulent field that has a different pattern than the regular (ASS + BSS) field. [3]使用大涡模拟 (LES) 结合燃烧模型闭合的 pdf 方法，研究了静止各向同性和各向异性湍流场中火焰内核动力学的物理机制。 [1] 从两个 DNS 数据库（$\mbox{Re}_\lambda$ 等于 150 和 418）获得的均质和各向同性湍流场被播种为随局部流体速度移动的点粒子，以获得拉格朗日压力历史。 [2] 常规场和有序场的俯仰角差异表明，有序场包含大部分各向异性湍流场，其模式与常规（ASS + BSS）场不同。 [3]
isotropic turbulent velocity 各向同性湍流速度
A distribution of Hill’s vortices is used to synthesize an anisotropic turbulent velocity field that satisfies the incompressibility condition and match a given Reynolds stress tensor. [1] A method for the numerical generation of anisotropic turbulent velocity fields is presented. [2] On the base of Randomized Spectral Method (RSM), a new stochastic algorithm for the generation of homogeneous anisotropic turbulent velocity fields has been developed. [3]希尔涡流的分布用于合成满足不可压缩条件并匹配给定雷诺应力张量的各向异性湍流速度场。 [1] 提出了一种数值生成各向异性湍流速度场的方法。 [2] 在随机谱法（RSM）的基础上，开发了一种新的随机生成均匀各向异性湍流速度场的算法。 [3]
isotropic turbulent cascade
We also show that the helicity of oblique fluctuations has little dependence on proton temperature anisotropy and is consistent with kinetic Alfven wave-like fluctuations from the anisotropic turbulent cascade. [1] We also find that the helicity of oblique fluctuations has little dependence on proton temperature anisotropy and is consistent with fluctuations from the anisotropic turbulent cascade. [2]我们还表明，倾斜波动的螺旋性对质子温度各向异性的依赖性很小，并且与来自各向异性湍流级联的动力学 Alfven 波状波动一致。 [1] 我们还发现斜涨落的螺旋性对质子温度各向异性的依赖性很小，并且与各向异性湍流级联的涨落一致。 [2]
isotropic turbulent case
Many flow configurations in nature and in the laboratories deviate from the ideal homogeneous and isotropic turbulent cases (HIT) characterised by the presence of direct energy cascade only and strong small-scales universality. [1] The alignment between strain and mixture fraction gradient differs slightly from the homogeneous isotropic turbulent case but agree remarkably well with previous results observed in homogeneous shear incompressible flows. [2]自然界和实验室中的许多流动配置都偏离了理想的均质和各向同性湍流情况 (HIT)，其特征是仅存在直接能量级联和强大的小尺度普遍性。 [1] 应变和混合分数梯度之间的对齐与均匀各向同性湍流情况略有不同，但与之前在均匀剪切不可压缩流动中观察到的结果非常吻合。 [2]
isotropic turbulent structure
In the wall-normal direction, particle distributions (mean/preferential concentration) exhibit two distinct behaviours in the inner flow and outer flow, corresponding to two highly anisotropic turbulent structures, LSMs and VLSMs. [1] The shear-layer involves anisotropic turbulent structures; thus, hybrid RANS/LES models, such as IDDES, are preferred over URANS. [2]在壁面法线方向上，粒子分布（平均/优先浓度）在内流和外流中表现出两种不同的行为，对应于两种高度各向异性的湍流结构，LSM 和 VLSM。 [1] 剪切层涉及各向异性湍流结构；因此，混合 RANS/LES 模型（例如 IDDES）优于 URANS。 [2]
isotropic turbulent eddy
Generally, the theory correctly predicts the measured log-amplitude variances, which are affected primarily by small-scale, isotropic turbulent eddies. [1] By improving the aerodynamic shape of the aircraft, it can produce a large number of anisotropic turbulent eddies which can effectively improve the passive jamming capability when the foil is cast. [2]通常，该理论正确地预测了测量的对数幅度方差，这些方差主要受小规模的各向同性湍流涡流的影响。 [1] 通过改进飞行器的气动外形，可以产生大量各向异性的湍流涡流，从而有效提高抛箔时的被动干扰能力。 [2]