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Study on the effect of shape parameters and initiation points of rectangular high explosive on the spatial distribution of blast loads 研究矩形高爆炸药的形状参数和起爆点对爆炸荷载空间分布的影响
IF 3.8 2区 工程技术 Q1 ENGINEERING, MECHANICAL Pub Date : 2024-09-18 DOI: 10.1007/s10409-024-23470-x
Longkui Chen  (, ), Hongyu Zhao  (, ), Yongliang Zhang  (, ), Shenghong Huang  (, ), Chunhai Li  (, )

Rectangular explosive charges are usually used in military or civilian explosive transportation and storage. The effects of shape parameters and detonation positions on the peak overpressure and maximum impulse of blasts lack comprehensive investigation, which is significant for the design of blast-resistant structures. In this paper, the side-length ratio of the rectangle, orientation, and detonation position of the charge are chosen as controlling parameters to investigate their influence on blast loads in the scaled distances of the gauges ranging from 0.63 to 10.54 m/kg1/3 with well validated 3D numerical simulations. The results show that there is a large difference in the near-field spatial distribution of the blast load of the rectangular charge; if the blast load of the rectangular charge is simply evaluated with the spherical charge, the maximum peak overpressure (maximum impulse) will be underestimated by a factor of 7.46 (4.84). This must be taken seriously by blast-resistant structure designers. With the increase in the scaled distance, when the critical scaled distance is greater than 6.32 (7.38) m/kg1/3, the influence of the charge shape on the maximum peak overpressure (maximum impulse) of the spatial blast load can be ignored. In general, the impact of detonation of the charge at the end on the maximum peak overpressure is greater compared with central detonation, but for the impact of the maximum impulse, it is necessary to pay attention to the side-length ratio of the rectangular charge and the specific detonation position on the end face. Furthermore, the structural response of steel plates placed at different azimuths under the blast load of a rectangular charge is preliminarily analyzed, and the results show that the deformation and energy of the plates are consistent with the distribution of the blast load. These analysis results provide a reference for the explosion protection design in near-field air explosions.

矩形炸药通常用于军用或民用炸药的运输和储存。形状参数和起爆位置对爆炸峰值超压和最大冲量的影响缺乏全面的研究,这对抗爆结构的设计意义重大。本文选择矩形的边长比、方向和装药的起爆位置作为控制参数,研究它们在 0.63 至 10.54 m/kg1/3 的量规比例距离内对爆炸荷载的影响,并进行了有效的三维数值模拟。结果表明,矩形装药爆炸荷载的近场空间分布存在很大差异;如果简单地用球形装药评估矩形装药的爆炸荷载,最大峰值超压(最大冲量)将被低估 7.46(4.84)倍。这一点必须引起抗爆结构设计人员的重视。随着缩放距离的增加,当临界缩放距离大于 6.32 (7.38) m/kg1/3 时,可以忽略装药形状对空间爆炸荷载最大峰值超压(最大脉冲)的影响。一般来说,与中心起爆相比,端部起爆的装药对最大峰值超压的影响更大,但对于最大冲量的影响,需要注意矩形装药的边长比和端面的具体起爆位置。此外,初步分析了在矩形装药爆炸荷载作用下,不同方位角放置的钢板的结构响应,结果表明钢板的变形和能量与爆炸荷载的分布是一致的。这些分析结果为近场空气爆炸中的防爆设计提供了参考。
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引用次数: 0
Discussion on isolation of flexible beams with various support configurations 讨论采用不同支撑结构的柔性梁的隔离问题
IF 3.8 2区 工程技术 Q1 ENGINEERING, MECHANICAL Pub Date : 2024-09-18 DOI: 10.1007/s10409-024-23474-x
Jun-Ning Zhang  (, ), Xiao-Ye Mao  (, ), Hu Ding  (, ), Li-Qun Chen  (, )

This work discusses the strain and acceleration suppression of a flexible beam subjected to different supports analytically. As classical protection, the beam is mounted on a vertical linear spring together with a linear damper in parallel. This is called linear isolation. To enhance isolation performance, nonlinearity is employed in the boundary. In addition, quasi-zero isolation is established based on the non-linearly enhanced one by adjusting the installation length of the horizontal spring. To discuss their performance fully and fairly, the amplitude, the acceleration, the potential energy of the beam, the input work of the excitation, the dissipation work of the beam, and the dynamics stress along the beam are investigated based on the same parameters. The comparison shows that all these isolations can protect the beam with high efficiency, even when the basement excitation is tiny. Although the linear isolation and the nonlinearly enhanced one will arouse two resonance peaks on both sides of the primary resonance of the beam without isolation, the maximum amplitudes of them are reduced a lot. But for the low frequency excitation, the quasi-zero isolation has the best performance as it drives the primary resonance to the high frequency region. The simulation shows that the beam needs a relatively soft isolation to avoid the damage caused by the shock vibration, including the quasi-zero one. In general, the quasi-zero isolation shows the best performance. The nonlinearly enhanced one is the suboptimal choice. The present work shows the capacities of three isolations for a flexible beam by the steady-state response and the shock vibration. It provides design suggestions for the isolation of flexible beams.

本研究通过分析讨论了承受不同支撑的柔性梁的应变和加速度抑制问题。作为传统的保护措施,梁安装在垂直线性弹簧上,同时并联一个线性阻尼器。这被称为线性隔离。为了提高隔离性能,在边界中采用了非线性。此外,还通过调整水平弹簧的安装长度,在非线性增强隔离的基础上建立准零隔离。为了全面、公正地讨论它们的性能,我们基于相同的参数研究了振幅、加速度、梁的势能、激励的输入功、梁的耗散功和沿梁的动态应力。比较结果表明,所有这些隔离装置都能高效地保护横梁,即使基底激励很小。虽然线性隔振和非线性增强隔振会在没有隔振的梁主共振两侧产生两个共振峰,但其最大振幅会大大减小。但对于低频激励,准零隔离性能最好,因为它能将主谐振推向高频区域。模拟结果表明,梁需要相对较软的隔振来避免冲击振动造成的损坏,包括准零隔振。一般来说,准零隔离性能最好。非线性增强型隔离装置是次优选择。本研究通过稳态响应和冲击振动显示了柔性梁的三种隔振能力。它为柔性梁的隔离提供了设计建议。
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引用次数: 0
Contact behaviors of rough surfaces under tension and bending 拉伸和弯曲下粗糙表面的接触行为
IF 3.8 2区 工程技术 Q1 ENGINEERING, MECHANICAL Pub Date : 2024-09-13 DOI: 10.1007/s10409-024-24067-x
Xiaoyu Tang  (, ), Wurui Ta  (, ), Youhe Zhou  (, )

The contact problem of deformed rough surfaces exists widely in complex engineering structures. How to reveal the influence mechanism of surface deformation on the contact properties is a key issue in evaluating the interface performances of the engineering structures. In this paper, a contact model is established, which is suitable for tensile and bending deformed contact surfaces. Four contact forms of asperities are proposed, and their distribution characteristics are analyzed. This model reveals the mechanism of friction generation from the perspective of the force balance of asperity. The results show the contact behaviors of the deformed contact surface are significantly different from that of the plane contact, which is mainly reflected in the change in the number of contact asperities and the real contact area. This study suggests that the real contact area of the interface can be altered by applying tensile and bending strains, thereby regulating its contact mechanics and conductive behavior.

变形粗糙表面的接触问题广泛存在于复杂的工程结构中。如何揭示表面变形对接触性能的影响机理,是评价工程结构界面性能的关键问题。本文建立了一个适用于拉伸和弯曲变形接触表面的接触模型。提出了四种接触形式的尖角,并分析了它们的分布特征。该模型从尖面受力平衡的角度揭示了摩擦产生的机理。结果表明,变形接触面的接触行为与平面接触的接触行为有显著不同,主要体现在接触表面的渐尖数量和实际接触面积的变化上。这项研究表明,可以通过施加拉伸和弯曲应变来改变界面的实际接触面积,从而调节其接触力学和导电行为。
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引用次数: 0
Experimental study of postcritical deformation stage realization in layered composites during tension using digital image correlation and acoustic emission 利用数字图像相关性和声发射对层状复合材料在拉伸过程中实现临界后变形阶段的实验研究
IF 3.8 2区 工程技术 Q1 ENGINEERING, MECHANICAL Pub Date : 2024-09-13 DOI: 10.1007/s10409-023-23468-x
Valeriy Wildemann, Elena Strungar, Dmitrii Lobanov, Artur Mugatarov, Ekaterina Chebotareva

Creating conditions to implement equilibrium processes of damage accumulation under a predictable scenario enables control over the failure of structural elements in critical states. It improves safety and reduces the probability of catastrophic behavior in case of accidents. Equilibrium damage accumulation in some cases leads to a falling part (called a postcritical stage) on the material’s stress-strain curve. It must be taken into account to assess the strength and deformation limits of composite structures. Digital image correlation method, acoustic emission (AE) signals recording, and optical microscopy were used in this paper to study the deformation and failure processes of an orthogonal-layup composite during tension in various directions to orthotropy axes. An elastic-plastic deformation model was proposed for the composite in a plane stress condition. The evolution of strain fields and neck formation were analyzed. The staging of the postcritical deformation process was described. AE signals obtained during tests were studied; characteristic damage types of a material were defined. The rationality and necessity of polymer composites’ postcritical deformation stage taken into account in refined strength analysis of structures were concluded.

在可预测的情况下,创造条件实现损伤累积的平衡过程,可以控制结构元件在临界状态下的失效。它提高了安全性,降低了发生事故时灾难性行为的概率。平衡损伤累积在某些情况下会导致材料应力-应变曲线上的下降部分(称为后临界阶段)。在评估复合材料结构的强度和变形极限时必须考虑到这一点。本文采用数字图像相关法、声发射(AE)信号记录和光学显微镜研究了正交铺层复合材料在正交轴不同方向拉伸时的变形和破坏过程。提出了复合材料在平面应力条件下的弹塑性变形模型。分析了应变场的演变和颈部的形成。描述了临界后变形过程的分期。研究了试验过程中获得的 AE 信号;定义了材料的特征损伤类型。得出结论认为,在结构的精细强度分析中考虑聚合物复合材料的临界后变形阶段是合理和必要的。
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引用次数: 0
The role of γ/γ interfacial spacing on the tensile behavior in lamellar TiAl alloy via molecular dynamics simulations 通过分子动力学模拟研究γ/γ界面间距对片状钛铝合金拉伸行为的影响
IF 3.8 2区 工程技术 Q1 ENGINEERING, MECHANICAL Pub Date : 2024-09-12 DOI: 10.1007/s10409-024-24030-x
Xiong Zhou  (, ), Shiping Wang  (, ), Zhongtao Lu  (, ), Xiege Huang  (, ), Xiaobin Feng  (, ), Jiayi Fu  (, ), Wenjuan Li  (, ), Pengcheng Zhai  (, ), Guodong Li  (, )

The lamellar microstructure is one of the most typical microstructures of TiAl alloys. There are three γ/γ interfaces with different microstructures in lamellar γ-TiAl alloys. In this work, we investigated the deformation processes of lamellar γ-TiAl alloys with different interfacial spacing (λ) via uniaxial tensile loading using molecular dynamics simulations, including true twin (TT), pseudo-twin (PT), rotational boundary (RB), and the mixed structure (TT ∥ PT ∥ RB). The results show that in all lamellar γ-TiAl samples, the Shockley partial dislocation prefers to nucleate in the region between two neighboring interfaces. Then, dislocations move towards, crossing the γ/γ interface. Finally, the dislocation slippage leads to the destruction of the interface, resulting in cracks and structural failure. With the decrease of λ, the ultimate strength slightly increases in the TT or PT structure of γ-TiAl, which follows the Hall-Petch relation. But in general, the interfacial spacing has a slight effect on the ultimate strengths of these four structures of γ-TiAl.

片状微结构是钛铝合金最典型的微结构之一。在片状γ-TiAl合金中存在三种不同微观结构的γ/γ界面。在这项工作中,我们利用分子动力学模拟研究了不同界面间距(λ)的片状γ-TiAl合金在单轴拉伸载荷下的变形过程,包括真孪晶(TT)、伪孪晶(PT)、旋转边界(RB)和混合结构(TT ∥ PT ∥ RB)。结果表明,在所有片状γ-钛铝样品中,肖克利偏位错都倾向于在两个相邻界面之间的区域成核。然后,位错向γ/γ界面移动并穿过该界面。最后,位错滑动导致界面破坏,从而产生裂缝和结构破坏。随着λ的减小,γ-TiAl的TT或PT结构的极限强度略有增加,这符合霍尔-佩奇关系。但总的来说,界面间距对这四种γ-TiAl 结构的极限强度影响较小。
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引用次数: 0
Dynamic damage response of sing-crystal NiTi alloys induced by shear localization 剪切定位诱导单晶镍钛合金的动态损伤响应
IF 3.8 2区 工程技术 Q1 ENGINEERING, MECHANICAL Pub Date : 2024-09-12 DOI: 10.1007/s10409-024-24177-x
Yuchen Zhang  (, ), Weilong Yang  (, ), Xin Yang  (, ), Jin Wang  (, ), Chao Lv  (, ), Hao Zhang  (, ), Xiaoyang Pei  (, ), Fang Wang  (, )

This work investigates the dynamic response of a monocrystalline nickel-titanium (NiTi) alloy at the atomic scale. The results deduced from non-equilibrium molecular dynamics modeling demonstrate that no shear deformation band (SDB) appears in the sample at an impact velocity of less than 0.75 km/s. As this velocity increases, shear deformations become pronouncedly localized, and the average spacing between SDBs decreases until it stabilizes. Combining shear stress and particle velocity profiles, the survival of SDBs is found to be closely associated with plastic deformation. The dislocations clustering around SDBs predominantly exhibit 〈100〉 partial dislocations, whereas 1/2〈111〉 full dislocations are dominant in those regions without SDBs. Void nucleation always occurs on SDBs. Subsequently, void growth promotes a change in the SDB distribution characteristic. For the case without SDB, voids are randomly nucleated, and the void growth exhibits a non-uniform manner. Thus, there is an interaction between shear localization and void evolution in the NiTi alloy subjected to intensive loading. This study is expected to provide in-depth insights into the microscopic mechanism of NiTi dynamic damage.

这项研究探讨了单晶镍钛(NiTi)合金在原子尺度上的动态响应。非平衡分子动力学建模推导出的结果表明,当冲击速度小于 0.75 km/s 时,样品中不会出现剪切变形带 (SDB)。随着速度的增加,剪切变形明显局部化,SDB 的平均间距减小直至稳定。结合剪切应力和颗粒速度剖面,可以发现 SDB 的存活与塑性变形密切相关。聚集在 SDB 周围的位错主要表现为〈100〉部分位错,而在没有 SDB 的区域,1/2〈111〉全位错占主导地位。空洞成核总是发生在 SDB 上。随后,空洞的生长促进了 SDB 分布特征的改变。在没有 SDB 的情况下,空洞是随机成核的,空洞的生长表现出不均匀的方式。因此,在承受高强度加载的镍钛合金中,剪切定位和空隙演化之间存在相互作用。这项研究有望深入揭示镍钛合金动态损伤的微观机理。
{"title":"Dynamic damage response of sing-crystal NiTi alloys induced by shear localization","authors":"Yuchen Zhang \u0000 (,&nbsp;),&nbsp;Weilong Yang \u0000 (,&nbsp;),&nbsp;Xin Yang \u0000 (,&nbsp;),&nbsp;Jin Wang \u0000 (,&nbsp;),&nbsp;Chao Lv \u0000 (,&nbsp;),&nbsp;Hao Zhang \u0000 (,&nbsp;),&nbsp;Xiaoyang Pei \u0000 (,&nbsp;),&nbsp;Fang Wang \u0000 (,&nbsp;)","doi":"10.1007/s10409-024-24177-x","DOIUrl":"10.1007/s10409-024-24177-x","url":null,"abstract":"<div><p>This work investigates the dynamic response of a monocrystalline nickel-titanium (NiTi) alloy at the atomic scale. The results deduced from non-equilibrium molecular dynamics modeling demonstrate that no shear deformation band (SDB) appears in the sample at an impact velocity of less than 0.75 km/s. As this velocity increases, shear deformations become pronouncedly localized, and the average spacing between SDBs decreases until it stabilizes. Combining shear stress and particle velocity profiles, the survival of SDBs is found to be closely associated with plastic deformation. The dislocations clustering around SDBs predominantly exhibit 〈100〉 partial dislocations, whereas 1/2〈111〉 full dislocations are dominant in those regions without SDBs. Void nucleation always occurs on SDBs. Subsequently, void growth promotes a change in the SDB distribution characteristic. For the case without SDB, voids are randomly nucleated, and the void growth exhibits a non-uniform manner. Thus, there is an interaction between shear localization and void evolution in the NiTi alloy subjected to intensive loading. This study is expected to provide in-depth insights into the microscopic mechanism of NiTi dynamic damage.</p></div>","PeriodicalId":7109,"journal":{"name":"Acta Mechanica Sinica","volume":null,"pages":null},"PeriodicalIF":3.8,"publicationDate":"2024-09-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142411562","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Surface element design of nanomaterials considering surface curvature dependence 考虑表面曲率相关性的纳米材料表面元件设计
IF 3.8 2区 工程技术 Q1 ENGINEERING, MECHANICAL Pub Date : 2024-09-12 DOI: 10.1007/s10409-024-24096-x
Yongchao Zhang  (, ), Lian Wang  (, ), Fangxin Wang  (, ), Bin Li  (, ), Xiaofan Gou  (, )

Nanomaterials have garnered recognition for their notable surface effects and demonstration of superior mechanical properties. Previous studies on the surface effects of nanomaterials, employing the finite element method, often relied on simplified two-dimensional models due to theoretical complexities. Consequently, these simplified models inadequately represent the mechanical properties of nanomaterials and fail to capture the substantial impact of surface effects, particularly the curvature dependence of nanosurfaces. This study applies the principle of minimum energy and leverages the Steigmann-Ogden surface theory of nanomaterials to formulate a novel finite element surface element that comprehensively accounts for surface effects. We conducted an analysis of the stress distribution and deformation characteristics of four typical 2D and 3D nanomaterial models. The accuracy of the developed surface element and finite element calculation method was verified through comparison with established references. The resulting finite element model provides a robust and compelling scientific approach for accurately predicting the mechanical performance of nanomaterials.

纳米材料因其显著的表面效应和卓越的机械性能而备受认可。由于理论上的复杂性,以往采用有限元法对纳米材料表面效应进行的研究往往依赖于简化的二维模型。因此,这些简化模型不能充分体现纳米材料的机械特性,也无法捕捉表面效应的实质性影响,尤其是纳米表面的曲率依赖性。本研究应用最小能量原理,并利用纳米材料的 Steigmann-Ogden 表面理论,制定了一种全面考虑表面效应的新型有限元表面元素。我们对四种典型二维和三维纳米材料模型的应力分布和变形特征进行了分析。通过与已有参考文献的对比,验证了所开发的表面元素和有限元计算方法的准确性。由此产生的有限元模型为准确预测纳米材料的机械性能提供了一种稳健而有说服力的科学方法。
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引用次数: 0
An optimal control method of internal resonances for vibration isolation system using an aperiodic isolator 使用非周期性隔振器的隔振系统内部共振优化控制方法
IF 3.8 2区 工程技术 Q1 ENGINEERING, MECHANICAL Pub Date : 2024-09-11 DOI: 10.1007/s10409-024-23535-x
Yujun Liu  (, ), Jing Liu  (, ), Guang Pan  (, ), Qiaogao Huang  (, ), Baowei Song  (, )

Periodic isolator is well known for its wave filtering characteristic. While in middle and high frequencies, the internal resonances of the periodic isolator are evident especially when damping is small. This study proposes a novel aperiodic vibration isolation for improving the internal resonances control of the periodic isolator. The mechanism of the internal resonances control by the aperiodic isolator is firstly explained. For comparing the internal resonances suppression effect of the aperiodic isolator with the periodic isolator, a dynamic model combing the rigid machine, the isolator, and the flexible plate is derived through multi subsystem modeling method and transfer matrix method, whose accuracy is verified through the finite element method. The influences of the aperiodicity and damping of the isolator on the vibration isolation performance and internal resonances suppression effect are investigated by numerical analysis. The numerical results demonstrate that vibration attenuation performances of the periodic isolator and aperiodic isolator are greatly over than that of the continuous isolator in middle and high frequencies. The aperiodic isolator opens the stop bandgaps comparing with the periodic isolator where the pass bandgaps are periodically existed. The damping of the isolator has the stop bandgap widening effect on both the periodic isolator and the aperiodic isolator. In addition, a parameter optimization algorithm of the aperiodic isolator is presented for improving the internal resonances control effect. It is shown that the vibration peaks within the target frequency band of the aperiodic isolator are effectively reduced after the optimization. Finally, the experiments of the three different vibration isolation systems are conducted for verifying the analysis work.

众所周知,周期性隔振器具有滤波特性。但在中高频率下,周期性隔振器的内部共振非常明显,尤其是当阻尼较小时。本研究提出了一种新型非周期性隔振器,用于改善周期性隔振器的内部共振控制。首先解释了非周期隔振器控制内部共振的机理。为了比较非周期性隔振器与周期性隔振器的内部共振抑制效果,通过多子系统建模法和传递矩阵法推导出了刚性机械、隔振器和挠性板的动态模型,并通过有限元法验证了模型的准确性。通过数值分析研究了隔振器的周期性和阻尼对隔振性能和内部共振抑制效果的影响。数值结果表明,周期性隔振器和非周期性隔振器在中高频的减振性能大大优于连续性隔振器。与周期性隔振器相比,非周期性隔振器打开了停止带隙,而周期性隔振器的通过带隙是周期性存在的。隔离器的阻尼对周期性隔离器和非周期性隔离器都有扩大停止带隙的作用。此外,还介绍了一种用于改善内部共振控制效果的非周期性隔离器参数优化算法。结果表明,经过优化后,非周期隔振器目标频段内的振动峰值得到了有效降低。最后,对三种不同的隔振系统进行了实验,以验证分析工作。
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引用次数: 0
Quantum-enriched large-eddy simulation with the incompressible Schrödinger flow 不可压缩薛定谔流的量子富集大涡流模拟
IF 3.8 2区 工程技术 Q1 ENGINEERING, MECHANICAL Pub Date : 2024-09-09 DOI: 10.1007/s10409-024-24054-x
Zishuo Han  (, ), Yue Yang  (, )

We propose a hybrid quantum-classical method, the quantum-enriched large-eddy simulation (QELES), for simulating turbulence. The QELES combines the large-scale motion of the large-eddy simulation (LES) and the subgrid motion of the incompressible Schrödinger flow (ISF). The ISF is a possible way to be simulated on a quantum computer, and it generates subgrid scale turbulent structures to enrich the LES field. The enriched LES field can be further used in turbulent combustion and multi-phase flows in which the subgrid scale motion plays an important role. As a conceptual study, we perform the simulations of ISF and LES separately on a classical computer to simulate decaying homogeneous isotropic turbulence. Then, the QELES velocity is obtained by the time matching and the spectral blending methods. The QELES achieves significant improvement in predicting the energy spectrum, probability density functions of velocity and vorticity components, and velocity structure functions, and reconstructs coherent small-scales vortices in the direct numerical simulation (DNS). On the other hand, the vortices in the QELES are less elongated and tangled than those in the DNS, and the magnitude of the third-order structure function in the QELES is less than that in the DNS, due to the different constitutive relations in the viscous flow and ISF.

我们提出了一种量子-经典混合方法,即量子富集大涡模拟(QELES),用于模拟湍流。量子富集大涡模拟(QELES)结合了大涡模拟(LES)的大尺度运动和不可压缩薛定谔流(ISF)的子网格运动。ISF 是在量子计算机上进行模拟的一种可能方式,它会产生子网格尺度的湍流结构,以丰富 LES 场。丰富的 LES 场可进一步用于湍流燃烧和多相流中,其中亚网格尺度运动起着重要作用。作为概念性研究,我们在经典计算机上分别进行了 ISF 和 LES 模拟,以模拟衰减的均质各向同性湍流。然后,通过时间匹配和频谱混合方法获得 QELES 速度。QELES 在预测能谱、速度和涡度分量的概率密度函数以及速度结构函数方面有显著改进,并能在直接数值模拟(DNS)中重建相干的小尺度涡。另一方面,由于粘性流和 ISF 的构成关系不同,QELES 中的涡没有 DNS 中的那么细长和纠结,QELES 中的三阶结构函数的大小也小于 DNS。
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引用次数: 0
Large eddy simulation of low-Reynolds-number flow past the SD7003 airfoil with an improved high-precision IPDG method 用改进的高精度 IPDG 方法对经过 SD7003 机翼的低雷诺数流进行大涡流模拟
IF 3.8 2区 工程技术 Q1 ENGINEERING, MECHANICAL Pub Date : 2024-09-09 DOI: 10.1007/s10409-024-23637-x
Shixi Hao  (, ), Ming Zhao  (, ), Qiushi Ding  (, ), Jiabing Xiao  (, ), Yanan Chen  (, ), Wei Liu  (, ), Xiaojian Li  (, ), Zhengxian Liu  (, )

At low-Reynolds-number, the performance of airfoil is known to be greatly affected by the formation and burst of a laminar separation bubble (LSB), which requires a more precise simulation of the delicate flow structures. A framework based on the interior penalty discontinuous Galerkin method and large eddy simulation approach was adopted in the present study. The performances of various subgrid models, including the Smagorinsky (SM) model, the dynamic Smagorinsky (DSM) model, the wall-adapting local-eddy-viscosity (WALE) model, and the VREMAN model, have been analyzed through flow simulations of the SD7003 airfoil at a Reynolds number of 60000. It turns out that the SM model fails to predict the emergence of LSB, even modified by the Van-Driest damping function. On the contrary, the best agreement is generally achieved by the WALE model in terms of flow separation, reattachment, and transition locations, together with the aerodynamic loads. Furthermore, the influence of numerical dissipation has also been discussed through the comparison of skin friction and resolved Reynolds stresses. As numerical dissipation decreases, the prediction accuracy of the WALE model degrades. Meanwhile, nonlinear variation could be observed from the performances of the DSM model, which could be attributed to the interaction between the numerical dissipation and the subgrid model.

众所周知,在低雷诺数条件下,层流分离气泡(LSB)的形成和破裂会极大地影响机翼的性能,因此需要对微妙的流动结构进行更精确的模拟。本研究采用了基于内部惩罚非连续 Galerkin 方法和大涡模拟方法的框架。通过对雷诺数为 60000 的 SD7003 机翼进行流动模拟,分析了各种子网格模型的性能,包括 Smagorinsky(SM)模型、动态 Smagorinsky(DSM)模型、壁面适配局部涡流粘度(WALE)模型和 VREMAN 模型。结果表明,即使经过 Van-Driest 阻尼函数的修正,SM 模型也无法预测 LSB 的出现。相反,WALE 模型在气流分离、重新附着、过渡位置以及气动载荷方面通常能达到最佳一致性。此外,还通过比较表皮摩擦力和解析雷诺应力讨论了数值耗散的影响。随着数值耗散的减小,WALE 模型的预测精度也随之降低。同时,从 DSM 模型的性能中可以观察到非线性变化,这可能归因于数值耗散与子网格模型之间的相互作用。
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引用次数: 0
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