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Hybrid RANS/LES Simulations of Two and Three Dimensional Supersonic Cavity Flows
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作者 H.B. Wang M.B. Sun H.Y. Wu Z.G. Wang 《Journal of Energy and Power Engineering》 2011年第2期97-104,共8页
Supersonic unsteady flows of two and three dimensional cavities, which have the same basic measures, length, depth and aft wall angle, are investigated numerically by using hybrid RANS/LES (Reynolds-Averaged Navier-S... Supersonic unsteady flows of two and three dimensional cavities, which have the same basic measures, length, depth and aft wall angle, are investigated numerically by using hybrid RANS/LES (Reynolds-Averaged Navier-Stokes/Large-Eddy Simulation) method. In particular, the mass exchange and oscillation characteristics of the cavities are analyzed and compared. It is shown that the two and three dimensional cavities have almost the same residence time except that the three dimensional one has a little larger mass decay at beginning, which may attribute to the influence of the streamwise vortices. The two dimensional cavity has three dominant frequencies while the three dimensional one has only one oscillation dominant frequency, that is, the three dimensional effects simplify the oscillation modes in the cavity. The distributions of oscillation energy are approximately universal in the transverse and spanwise directions. However, the oscillation energy in the streamwise direction shows a hybrid monotone/periodic distribution, which may be caused by the streamwise-propagating pressure waves. 展开更多
关键词 hybrid rans/les SUPERSONIC CAVITY mass exchange oscillation.
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Stress-Blended Eddy Simulation of the Turbulent Flow Around Circular Cylinder with Dynamic Hybrid RANS/LES Model 被引量:1
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作者 Chunbao Liu Jing Li +2 位作者 Weiyang Bu Dong Xu Wen Wu 《Journal of Beijing Institute of Technology》 EI CAS 2019年第2期238-247,共10页
In order to verify the effectiveness and superiority of the dynamic hybrid RANS/LES(DHRL)model,the flow around a cylinder with sinusoidal fluctuating velocity at the inlet was used as the test case.The latest computat... In order to verify the effectiveness and superiority of the dynamic hybrid RANS/LES(DHRL)model,the flow around a cylinder with sinusoidal fluctuating velocity at the inlet was used as the test case.The latest computational fluid dynamics(CFD)model can flexibly choose any existing large-eddy simulation(LES)method combined with RANS method to calculate the flow field.In addition,the DLES model and DDES model are selected as typical representatives of the turbulence model to compare the capture ability of the flow field mechanism.The internal flow field including the y+value,velocity distribution,turbulent kinetic energy and vortex structures is comprehensively analyzed.Finally,the results show that the new model has enough sensitivity to capture the information of the flow field and has more consistent velocity distribution with the experimental value,which shows its potential in practical engineering applications to some extent. 展开更多
关键词 DYNAMIC hybrid rans/les(DHRL) TURBULENCE flow around CYLINDER computational fluid dynamics(CFD)
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Numerical study on turbulent mixed convection in a vertical plane channel using hybrid RANS/LES and LES models
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作者 Puxian Ding Shuangfeng Wang Kai Chen 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2020年第1期1-8,共8页
Two Delayed-Detached Eddy Simulation(DDES) models, and a Large-Eddy Simulation(LES) model are used to investigate the turbulent flows and mixed convection between a hot plate and a cold plate via the software FLUENT. ... Two Delayed-Detached Eddy Simulation(DDES) models, and a Large-Eddy Simulation(LES) model are used to investigate the turbulent flows and mixed convection between a hot plate and a cold plate via the software FLUENT. The two DDES models include Production-limited DDES(PL-DDES) and Improved DDES(IDDES) models.The Wall-Adapting Local Eddy-Viscosity(WALE) model is the used LES model. The numerical computations are performed at Reynolds number Reb= 4494 and different Richardson numbers Ri = 0.025, 0.048, 0.1. The comparing data is from the Direct Numerical Simulation(DNS) at Reb= 4494 and Ri = 0.048. The comparison reveals that the two DDES models have better performance in predicting time-averaged parameters than the WALE model in the aiding flow. The best predicted time-averaged results are obtained by the PL-DDES model in the opposing flow. Furthermore, the results of different Ri obtained by the PL-DDES model agree well with the DNS data. 展开更多
关键词 TURBULENT mixed CONVECTION hybrid rans/les MODEL PL-DDES MODEL WALE MODEL Vertical plane CHANNEL
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基于RANS/LES混合方法的三维L型弯管流场特性数值模拟
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作者 陈喆 仝哲 +1 位作者 韩盼盼 尤云祥 《船舶工程》 CSCD 北大核心 2024年第6期138-143,152,共7页
L型弯管是船用典型部件,可实现流体质量输运和热量交换等功能。由于弯曲段曲率的影响,其内部流动十分复杂。传统的雷诺平均方法(RANS)无法模拟弯曲段的复杂流动,而大涡模拟方法(LES)则计算量太大。为此,采用RANS/LES混合方法对经典L型... L型弯管是船用典型部件,可实现流体质量输运和热量交换等功能。由于弯曲段曲率的影响,其内部流动十分复杂。传统的雷诺平均方法(RANS)无法模拟弯曲段的复杂流动,而大涡模拟方法(LES)则计算量太大。为此,采用RANS/LES混合方法对经典L型弯管进行数值模拟研究,该方法在近壁面区域采用RANS方法,在湍流核心区采用LES方法,不仅可保持模拟精度,而且网格需求量较低更适用于工程应用。针对商软中的2类RANS/LES方法——脱体涡方法(IDDES)及应力混合涡模拟(SBES)方法,比较分析其在L型弯管内部流场仿真方面的优劣,并同时考虑流向曲率修正的影响。结果表明:SBES方法对弯管内二次流(迪恩涡)的预测能力优于IDDES方法,且曲率修正模型可进一步改善SBES方法的仿真结果。 展开更多
关键词 雷诺平均/大涡模拟混合方法 L型弯管 流向曲率修正 脱体涡方法 应力混合涡模拟
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亚临界区圆柱绕流相干结构壁面模化混合RANS/LES模型
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作者 季梦 尤云祥 +3 位作者 韩盼盼 邱小平 马乔 吴凯健 《物理学报》 SCIE EI CAS CSCD 北大核心 2024年第5期190-216,共27页
本文发展了一种具有壁面模化大涡模拟能力的雷诺平均纳维-斯托克斯(RANS)和大涡模拟(LES)方法的混合模型(简称WM-HRL模型),致力于对亚临界区雷诺数钝体绕流相干结构这类复杂流动现象进行高置信度的CFD解析模拟研究.该方法通过一个仅与... 本文发展了一种具有壁面模化大涡模拟能力的雷诺平均纳维-斯托克斯(RANS)和大涡模拟(LES)方法的混合模型(简称WM-HRL模型),致力于对亚临界区雷诺数钝体绕流相干结构这类复杂流动现象进行高置信度的CFD解析模拟研究.该方法通过一个仅与当地网格空间分布尺寸有关的湍动能解析度指标参数rk即可实现从RANS到LES的无缝快速转换,并且RANS/LES混合转换区的边界位置及其各个分区(包括RANS区、LES区及RANS/LES混合转换区)对湍动能的解析能力均可通过两个指标参数nrk1-Q和nrk2-Q准则进行预先设定.通过对雷诺数Re=3900下圆柱绕流场的系列数值模拟研究,获得了能够高置信度解析并捕捉其绕流场中三维时空瞬态发展相干结构特性的湍动能解析度指标参数nrk1-Q和nrk2-Q准则的组合条件.研究表明,该WM-HRL模型不仅能够准确获取圆柱绕流场中剪切层小尺度K-H不稳定性结构的精细谱结构,而且在同一套网格系统下通过变化湍动能解析度指标参数nrk2-Q和nrk1-Q准则的组合条件,还可以精细解析圆柱绕流场中两类不同回流区的长度结构特征,及其对应的圆柱尾部近壁面处V和U形两个平均流向速度剖面的分支结构特性. 展开更多
关键词 圆柱绕流 相干结构 KELVIN-HELMHOLTZ不稳定性 混合rans/les模型
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A hybrid RANS/LES model for simulating time-dependent cloud cavitating flow around a NACA66 hydrofoil 被引量:4
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作者 ZHANG GuangJian SHI WeiDong +2 位作者 ZHANG DeSheng WANG Chuan ZHOU Ling 《Science China(Technological Sciences)》 SCIE EI CAS CSCD 2016年第8期1252-1264,共13页
Cloud cavitating flow is highly turbulent and dominated by coherent large-scale anisotropic vortical structures. For the numer- ical investigation of such a class of flow, large eddy simulation (LES) is a reliable m... Cloud cavitating flow is highly turbulent and dominated by coherent large-scale anisotropic vortical structures. For the numer- ical investigation of such a class of flow, large eddy simulation (LES) is a reliable method but it is computationally extremely costly in engineering applications. An efficient approach to reduce the computational cost is to combine Reynolds-averaged Navier-Stokes (RANS) equations with LES used only in the parts of interest, such as massively separated flow regions. A new hybrid RANS/LES model, the modified filter-based method (FBM), is proposed in the present study which can perform RANS or LES depending on the numerical resolution. Compared to the original FBM, the new method has three modifications: the state-of-the-art shear stress transport (SST) model replaces the k-c model as a baseline RANS model. A shielding function is introduced to obviate the switch from RANS to LES occurring inside the boundary layer. An appropriate threshold controlling the switch from RANS to LES is added to achieve an optimal predictive accuracy. The new model is assessed for its predictive capability of highly unsteady cavitating flows in a typical case of cloud cavitation around a NACA66 hydrofoil. The new mod- el results are compared with data obtained from the Smagorinsky LES and SST model based on the same homogeneous Zwart cavitation model. It is found that the modified FBM method has significant advantages over SST model in all aspects of pre- dicted instantaneous and mean flow field, and its predictive accuracy is comparable to the Smagorinsky LES model even using a much coarser grid in the simulations. 展开更多
关键词 hybrid rans/les model eddy viscosity vortical structure cloud cavitation HYDROFOIL
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基于RANS/LES混合方法的近岸水域波浪增阻影响的数值模拟
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作者 黄鑫伟 程志友 +1 位作者 胡健 胡成 《船舶工程》 CSCD 北大核心 2023年第1期63-70,83,共9页
分析船舶在近岸水域航行时所受波浪增阻大小的影响因素,以寻求降低波浪增阻的方法。基于近岸水域中船舶阻力理论,采用雷诺平均(RANS)和大涡模拟(LES)相结合的方法进行数值求解,并运用两相流方法和造波消波技术建立数值水池模型。用Fluen... 分析船舶在近岸水域航行时所受波浪增阻大小的影响因素,以寻求降低波浪增阻的方法。基于近岸水域中船舶阻力理论,采用雷诺平均(RANS)和大涡模拟(LES)相结合的方法进行数值求解,并运用两相流方法和造波消波技术建立数值水池模型。用Fluent求解器对船舶在不同工况下的波浪增阻进行数值模拟。试验结果表明:用该方法对近岸水域航行的船舶进行波浪增阻的数值模拟可有效提高计算机运算效率,在粗糙网格层面上得到的计算结果精度良好;船舶在近岸水域中航行时的波浪增阻随波高的增加而增加,并且与船体湿润面积呈正相关;船舶在近岸水域以中低速航行时所受波浪增阻随弗劳德数的增加而增加。该研究为近岸水域通航船舶减小航行阻力提供了可行的方法与思路。 展开更多
关键词 rans/les混合方法 近岸水域 波浪增阻 数值模拟
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基于RANS/LES混合方法的箱梁气动导纳函数研究
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作者 张伟峰 张志田 《振动与冲击》 EI CSCD 北大核心 2023年第18期19-29,共11页
为了研究RANS/LES(Reynolds-averaged navier-stokes/large eddy simulation)混合方法在桥梁非定常气动力的应用以及大积分尺度湍流中桥梁断面的气动导纳函数,首先选取3种典型的RANS/LES混合方法,即SBES(stress-blended eddy simulation... 为了研究RANS/LES(Reynolds-averaged navier-stokes/large eddy simulation)混合方法在桥梁非定常气动力的应用以及大积分尺度湍流中桥梁断面的气动导纳函数,首先选取3种典型的RANS/LES混合方法,即SBES(stress-blended eddy simulation)方法、SAS(scale-adaptive simulation)方法、WMLES(wall-modeled LES)方法,分别对3种方法的特点和适用性进行简要的概述,然后在均匀流中将其用于箱梁断面和分离式双箱梁断面气动力的计算,最后在提出的改进湍流合成方法基础上,实现了与实际桥位处积分尺度类似的大积分尺度湍流模拟,在此流场中识别了箱梁断面的气动导纳函数。数值计算结果表明,SBES方法适用于弱流动不稳定和强流动不稳定流场气动力的模拟,SAS方法仅适用于显著流动分离的断面,而WMLES方法对两种断面整体表现都较差。对于流线型箱梁断面,大积分尺度湍流场中识别的升力气动导纳在低频处大于Sears函数和小尺度湍流场中的结果,并显著大于节段模型风洞试验结果。在高频处大积分尺度湍流场的结果与小尺度湍流场以及风洞试验结果吻合较好。研究结果表明,将传统小尺度格栅湍流场风洞试验识别的气动导纳用于桥梁抖振分析时,会导致低频处的抖振力显著偏小。 展开更多
关键词 桥梁断面 rans/les方法 数值模拟 大尺度湍流 气动导纳
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Prediction of separation flows around a 6:1 prolate spheroid using RANS/LES hybrid approaches 被引量:11
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作者 Zhixiang Xiao Yufei Zhang Jingbo Huang Haixin Chen Song Fu School of Aerospace Engineering,Tsinghua University,Beijing 100084,China 《Acta Mechanica Sinica》 SCIE EI CAS CSCD 2007年第4期369-382,共14页
This paper presents hybrid Reynolds-averaged Navier-Stokes (RANS) and large-eddy-simulation (LES) methods for the separated flows at high angles of attack around a 6:1 prolate spheroid. The RANS/LES hybrid meth- ... This paper presents hybrid Reynolds-averaged Navier-Stokes (RANS) and large-eddy-simulation (LES) methods for the separated flows at high angles of attack around a 6:1 prolate spheroid. The RANS/LES hybrid meth- ods studied in this work include the detached eddy simulation (DES) based on Spalart-Allmaras (S-A), Menter's k-ω shear-stress-transport (SST) and k-o9 with weakly nonlinear eddy viscosity formulation (Wilcox-Durbin+, WD+) models and the zonalANS/LES methods based on the SST and WD+ models. The switch from RANS near the wall to LES in the core flow region is smooth through the implementation of a flow-dependent blending function for the zonal hybrid method. All the hybrid methods are designed to have a RANS mode for the attached flows and have a LES behavior for the separated flows. The main objective of this paper is to apply the hybrid methods for the high Reynolds number separated flows around prolate spheroid at high-incidences. A fourth-order central scheme with fourth-order artificial viscosity is applied for spatial differencing. The fully implicit lower-upper symmetric-Gauss-Seidel with pseudo time sub-iteration is taken as the temporal differentiation. Comparisons with available measurements are carried out for pressure distribution, skin friction, and profiles of velocity, etc. Reasonable agreement with the experiments, accounting for the effect on grids and fundamental turbulence models, is obtained for the separation flows. 展开更多
关键词 rans/les hybrid methods DES Zonal-rans/les Weakly nonlinear correction
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基于RANS/LES模型的某飞机前襟封严板动载荷计算研究
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作者 刘征 任智勇 +1 位作者 王国良 杨勇 《教练机》 2023年第4期22-25,39,共5页
某飞机前襟下偏后,气流会穿过前襟和翼盒之间的缝隙,从下翼面流向上翼面从而形成射流,造成封严板的支撑件疲劳破坏。RANS模型在湍流的核心区会得到较大湍流粘性,并将过多的动量变化计入雷诺应力项,得到的载荷波动量过小;而RANS/LES模型... 某飞机前襟下偏后,气流会穿过前襟和翼盒之间的缝隙,从下翼面流向上翼面从而形成射流,造成封严板的支撑件疲劳破坏。RANS模型在湍流的核心区会得到较大湍流粘性,并将过多的动量变化计入雷诺应力项,得到的载荷波动量过小;而RANS/LES模型,在附面层内求解RANS方程,在分离区进行LES处理,得到的湍流粘性低,适合于动载荷的预测。本文以某飞机的前襟封严板的动载荷计算为例,对上述两种方法进行了对比并得出了结论。 展开更多
关键词 动载荷 les rans CFD
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Interaction mechanisms of shock waves with the boundary layer and wakes in a highly-loaded NGV using hybrid RANS/LES 被引量:6
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作者 Xiutao BIAN Qingsong WANG +1 位作者 Xinrong SU Xin YUAN 《Chinese Journal of Aeronautics》 SCIE EI CAS CSCD 2020年第1期149-160,共12页
Accurate predictions of Shock Waves and Boundary Layer Interaction(SWBLI)and strong Shock Waves and Wake Vortices Interaction(SWWVI)in a highly-loaded turbine propose challenges to the currently widely used Reynolds-A... Accurate predictions of Shock Waves and Boundary Layer Interaction(SWBLI)and strong Shock Waves and Wake Vortices Interaction(SWWVI)in a highly-loaded turbine propose challenges to the currently widely used Reynolds-Averaged Navier-Stokes(RANS)model.In this work,the SWBLI and the SWWVI in a highly-loaded Nozzle Guide Vane(NGV)are studied using a hybrid RANS/LES strategy.The Turbulence Kinetic Energy(TKE)budget and the Proper Orthogonal Decomposition(POD)method are used to analyze flow mechanisms.Results show that this hybrid RANS/LES method can obtain detailed flow structures for flow mechanisms analysis.Strong shock waves induce boundary layer separation,while the presence of a separation bubble can in turn lead to a Mach reflection phenomenon.The shock waves cause trailing-edge vortices to break clearly,and the wakes,in turn,can change the shocks intensity and direction.Furthermore,the Entropy Generation Rate(EGR)is used to analyze the irreversible loss.It turns out that the SWWVI can reduce the flow field loss.There are several weak shock waves in the NGV flow field,which can increase the irreversible loss.This work offers flow mechanisms analysis and presents the EGR distribution in SWBLI and SWWVI areas in a transonic turbine blade. 展开更多
关键词 BOUNDARY layer hybrid rans/les NGV Shock WAVES WAKES
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Application of the hybrid RANS/LES method on the hydraulic dynamic performance of centrifugal pumps 被引量:1
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作者 Zheng-chuan Zhang Hong-xun Chen +4 位作者 Zheng Ma Qun Wei Jian-wu He Hui Liu Chao Liu 《Journal of Hydrodynamics》 SCIE EI CSCD 2019年第3期637-640,共4页
The nonlinear hybrid RANS/LES method has been developed considering the simulation efficiency and accuracy to simulate the hydraulic dynamic characteristics of the centrifugal pump. It has been proved that the nonline... The nonlinear hybrid RANS/LES method has been developed considering the simulation efficiency and accuracy to simulate the hydraulic dynamic characteristics of the centrifugal pump. It has been proved that the nonlinear hybrid RANS/LES method could effectively capture the unsteady flow structure and pressure pulsation in 2?D centrifugal pumps. To further investigate the hydraulic dynamic performance of a redesigned 3-D-gap drainage centrifugal pump, the nonlinear hybrid RANS/LES method is employed. Both numerical simulation and experimental results show that the hydraulic performance and pressure pulsation characteristics of the 3-D-gap drainage impeller centrifugal pump are significantly enhanced. 展开更多
关键词 3-D GAP drainage BLADES nonlinear hybrid rans/les METHOD pressure PULSATION
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3-D hybrid LES-RANS model for simulation of open-channel T-diversion flows 被引量:1
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作者 Jie ZHOU Cheng ZENG 《Water Science and Engineering》 EI CAS 2009年第3期13-26,共14页
The study of flow diversions in open channels plays an important practical role in the design and management of open-channel networks for irrigation or drainage. To accurately predict the mean flow and turbulence char... The study of flow diversions in open channels plays an important practical role in the design and management of open-channel networks for irrigation or drainage. To accurately predict the mean flow and turbulence characteristics of open-channel dividing flows, a hybrid LES-RANS model, which combines the large eddy simulation (LES) model with the Reynolds-averaged Navier-Stokes (RANS) model, is proposed in the present study. The unsteady RANS model was used to simulate the upstream and downstream regions of a main channel, as well as the downstream region of a branch channel. The LES model was used to simulate the channel diversion region, where turbulent flow characteristics are complicated. Isotropic velocity fluctuations were added at the inflow interface of the LES region to trigger the generation of resolved turbulence. A method based on the virtual body force is proposed to impose Reynolds-averaged velocity fields near the outlet of the LES region in order to take downstream flow effects computed by the RANS model into account and dissipate the excessive turbulent fluctuations. This hybrid approach saves computational effort and makes it easier to properly specify inlet and outlet boundary conditions. Comparison between computational results and experimental data indicates that this relatively new modeling approach can accurately predict open-channel T-diversion flows. 展开更多
关键词 hybrid les-rans model open-channel flow T-diversion turbulence modeling
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An hybrid RANS/LES model for simulation of complex turbulent flow
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作者 魏群 陈红勋 马峥 《Journal of Hydrodynamics》 SCIE EI CSCD 2016年第5期811-820,共10页
A nonqinear eddy viscosity model (NLEVM) and a scalable hybrid Reynolds averaged Navier-Stokes/large eddy simula- tion (RANS/LES) strategy are developed to improve the capability of the eddy viscosity model (EVM... A nonqinear eddy viscosity model (NLEVM) and a scalable hybrid Reynolds averaged Navier-Stokes/large eddy simula- tion (RANS/LES) strategy are developed to improve the capability of the eddy viscosity model (EVM) to simulate complex flows featuring separations and unsteady motions. To study the performance of the NLEVM, numerical simulations around S809 airfoil are carried out and the results show that the NLEVM performs much better when a large separation occurs. Calculated results of the flow around a triangular cylinder show that the NLEVM can improve the precision of the flow fields to some extents, but the error is still considerable, and the small turbulence structures can not be clearly captured as the EVM. Whereas the scalable hybrid RANS/LES model based on the NLEVM is fairy effective on resolving the turbulent structures and can give more satisfactory predictions of the flow fields. 展开更多
关键词 turbulence model non-linear eddy viscosity model (NLEVM) hybrid Reynolds averaged Navier-Stokes/large eddysimulation rans/les
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采用RANS/LES混合方法研究分离流动 被引量:16
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作者 肖志祥 陈海昕 +1 位作者 李启兵 符松 《空气动力学学报》 EI CSCD 北大核心 2006年第2期218-222,共5页
采用结合湍流模式和大涡模拟(LES)的混合方法数值模拟Aerospatial A-profile翼型以及细长椭球体大迎角分离流动。该类混合方法比较适于模拟分离流动:近壁区附体流动采用湍流模式,而远离物面分离区域内的大尺度运动则用LES方法。通过计... 采用结合湍流模式和大涡模拟(LES)的混合方法数值模拟Aerospatial A-profile翼型以及细长椭球体大迎角分离流动。该类混合方法比较适于模拟分离流动:近壁区附体流动采用湍流模式,而远离物面分离区域内的大尺度运动则用LES方法。通过计算和实验结果的对比,混合方法切实可行并具有很大的发展潜力。 展开更多
关键词 rans/les混合方法 分离流动 湍流模式
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不同RANS/LES混合模型的汽车气动噪声分析 被引量:6
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作者 谢超 谷正气 +3 位作者 杨振东 宗轶琦 杨晓涛 罗泽敏 《汽车工程》 EI CSCD 北大核心 2015年第4期440-445,459,共7页
采用Fluent UDF构造Realizable k-ε/LES、SST k-ε/LES和Spalart-Allmaras/LES 3种RANS/LES混合模型,并对汽车的气动噪声进行数值模拟。在近壁面采用RANS湍流模型求解,而远离物面的分离区域内的大尺度运动则用LES求解,将3种混合模型的... 采用Fluent UDF构造Realizable k-ε/LES、SST k-ε/LES和Spalart-Allmaras/LES 3种RANS/LES混合模型,并对汽车的气动噪声进行数值模拟。在近壁面采用RANS湍流模型求解,而远离物面的分离区域内的大尺度运动则用LES求解,将3种混合模型的计算结果与全LES湍流模型和风洞试验结果进行了比较。结果表明,3种混合模型对气动噪声的计算精度高于LES湍流模型;Realizable k-ε/LES和SST k-ε/LES混合模型数值模拟结果与试验值的相对误差均小于5%,而其中Realizable k-ε/LES混合模型更为准确和高效,消耗的计算资源更少。 展开更多
关键词 rans/les混合模型 气动噪声 数值计算
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联合RANS/LES方法数值模拟方柱绕流 被引量:7
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作者 唐鹏 韩省思 +1 位作者 叶桃红 陈义良 《中国科学技术大学学报》 CAS CSCD 北大核心 2010年第12期1287-1292,共6页
在粗细两套网格上,采用联合RANS/LES数值模拟Re=2.2×104的非定常方柱绕流经典算例.以标准的k-ε模型为基础,采用两种亚格子湍流模化方法,分别为PRNS(partially resolved numerical simulation)和DES(detached eddy simulation).PRN... 在粗细两套网格上,采用联合RANS/LES数值模拟Re=2.2×104的非定常方柱绕流经典算例.以标准的k-ε模型为基础,采用两种亚格子湍流模化方法,分别为PRNS(partially resolved numerical simulation)和DES(detached eddy simulation).PRNS模型与计算网格无显式关联,而DES与网格有一定关联.计算结果表明,联合RANS/LES方法即使在较粗的网格上也能得到较好的结果,DES方法预测到了二维模拟中的"双周期"现象,整体表现优于PRNS方法;亚尺度湍流模化中与计算网格的关联程度对结果有较大影响. 展开更多
关键词 联合rans/les方法 方柱绕流 非稳态流动 数值模拟
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超声速湍流流场的RANS/LES混合计算方法研究 被引量:7
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作者 袁先旭 邓小兵 +1 位作者 谢昱飞 张志成 《空气动力学学报》 EI CSCD 北大核心 2009年第6期723-728,共6页
采用对接/拼接网格技术,建立了基于分区混合和基于湍流尺度混合的双重RANS/LES混合计算模型,并对环翼低速绕流、翼型跨声速绕流和球锥带凹窗外形二维超声速绕流进行了初步的数值模拟。环翼和翼型绕流计算表明,该混合模型可给出较合理的... 采用对接/拼接网格技术,建立了基于分区混合和基于湍流尺度混合的双重RANS/LES混合计算模型,并对环翼低速绕流、翼型跨声速绕流和球锥带凹窗外形二维超声速绕流进行了初步的数值模拟。环翼和翼型绕流计算表明,该混合模型可给出较合理的湍流宏观平均量;球锥带凹窗外形二维超声速绕流计算表明,该混合模型可得到超声速瞬态湍流脉动流场,凹窗处存在复杂的旋涡结构和波系结构,呈现较大尺度的脉动。但该模型还需要进一步的考核验证。 展开更多
关键词 气动光学效应 rans les rans/les
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基于混合LES/RANS方法的引水隧洞施工通风数值模拟 被引量:6
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作者 王晓玲 刘长欣 +2 位作者 禹旺 刘震 吕鹏 《水利水电技术》 CSCD 北大核心 2018年第10期93-99,共7页
为了获取准确的水电工程引水隧洞施工通风瞬态流场信息并且提高计算效率,基于Realizable k-ε两方程湍流模型建立引水隧洞施工通风三维非稳态混合LES/RANS模型,并结合某引水隧洞施工通风过程进行数值模拟,借助现场实测风速数据对数值模... 为了获取准确的水电工程引水隧洞施工通风瞬态流场信息并且提高计算效率,基于Realizable k-ε两方程湍流模型建立引水隧洞施工通风三维非稳态混合LES/RANS模型,并结合某引水隧洞施工通风过程进行数值模拟,借助现场实测风速数据对数值模拟结果进行验证,同时将混合LES/RANS模型的模拟结果与RANS模型和LES模型的模拟结果进行对比。结果表明:混合LES/RANS数值模拟结果与现场实测数据较为吻合,其平均相对误差仅为4. 9%。混合LES/RANS方法仅需1 163 996个计算网格即可获得准确的瞬态风流场扩散规律,而LES方法所需网格数量近似为前者的2倍。混合LES/RANS方法可以为水电工程引水隧洞的施工通风数值模拟研究提供重要的理论与技术支撑。 展开更多
关键词 引水隧洞 施工通风 数值模拟 混合les/rans方法 风流场分布
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复杂湍流流动的混合RANS/LES方法研究 被引量:8
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作者 孙明波 汪洪波 +2 位作者 梁剑寒 刘卫东 王振国 《航空计算技术》 2011年第1期24-29,33,共7页
混合RANS/LES方法是近年来复杂湍流模拟的重要方法。简要回顾了混合RANS/LES模拟方法的发展历程,着重总结和分析了分离涡混合模型、类Menter SST混合模型以及湍流能量谱一致混合方法三类混合模型的构造方法和发展历程,对这三种方法的应... 混合RANS/LES方法是近年来复杂湍流模拟的重要方法。简要回顾了混合RANS/LES模拟方法的发展历程,着重总结和分析了分离涡混合模型、类Menter SST混合模型以及湍流能量谱一致混合方法三类混合模型的构造方法和发展历程,对这三种方法的应用以及优缺点进行了简要评述,最后指出了混合RANS/LES方法发展应该兼顾的问题,为下一步的混合RANS/LES模拟提供了参考。 展开更多
关键词 湍流流动 混合rans/les方法 混合函数 分离涡模拟
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