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A simple method of depressing numerical dissipation effects during wave simulation within the Euler model 认领
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作者 Zhe Hu Xiaoying Zhang +3 位作者 Weicheng Cui Fang Wang Xiaowen Li Yan Li 《海洋学报:英文版》 SCIE CAS CSCD 2020年第1期141-156,共16页
Numerical wave tanks are widely-acknowledged tools in studying waves and wave-structure interactions. They can generate waves under realistic scales and offers more information on the fluid field. However, most numeri... Numerical wave tanks are widely-acknowledged tools in studying waves and wave-structure interactions. They can generate waves under realistic scales and offers more information on the fluid field. However, most numerical wave tanks suffer from issues known as the numerical dissipation and numerical dispersion. The former causes wave energy to be slowly dissipated and the latter shifts wave frequencies during wave propagation. This paper proposes a simple method of depressing numerical dissipation effects on the basis of solving Euler equations using the finite difference method(FDM). The wave propagation solutions are solved analytically taking into account the influence of the damping terms. The main idea of the method is to append a source term to the momentum equation, whose strength is determined by how strong the numerical damping effect is. The method is verified by successfully depressing numerical effects during the simulation of regular linear waves, Stokes waves and irregular waves. By applying the method, wave energy is able to be close to its initial value after long distance of travel. 展开更多
关键词 NUMERICAL DISSIPATION NUMERICAL WAVE tank WAVE simulation NUMERICAL DAMPING reduction finite difference METHOD
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Numerical Study on NOx Emissions of Methane Re-Combustion in a 600 MWe Coal-Fired Boiler 认领
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作者 Xiaotao Zhang Hussain Ahmad Madni Gondal +4 位作者 Foyuan Duan Weidong Zhang Haoliang Mu Chengyu Zhang Aijun Wang 《能源与动力工程(英文)》 2020年第3期101-107,共7页
The fuel staging combustion technology is a promising low NOx combustion technology for coal-fired boiler. In order to reduce NOx emissions, the burners of a 600?MWe coal-fired boiler are retrofitted in which methane ... The fuel staging combustion technology is a promising low NOx combustion technology for coal-fired boiler. In order to reduce NOx emissions, the burners of a 600?MWe coal-fired boiler are retrofitted in which methane gas is selected as a secondary fuel for re-combustion. The CFD models of combustion process are built to investigate?effects of the methane gasratio on combustion process and NOx emissions. A total of 4 cases are numerically studied, including the pure coal combustion case, the coal combustion with 7.5%, 10%, 12.5% of methane gas re-combustion cases respectively. The results show that the re-combustion of methane can reduce the temperature at primary combustion zone, but increase the temperatures at the re-combustion area and the furnace outlet. The NOx concentration at the furnace outlet reduces with the increasing methane gas ratio.?Methane re-combustion can greatly benefit to the NOx emissions reduction. 展开更多
关键词 NUMERICAL Simulation Re-Combustion NOx EMISSION Reduction
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急冷塔运行工况参数的数值模拟分析 认领
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作者 郭慧媛 《广州化工》 CAS 2020年第9期122-123,185,共3页
固体废物焚烧烟气急冷塔是控制二噁英类污染的一种常用设备,急冷塔的液滴蒸发效率和降温效果是抑制二噁英生成的关键因素。利用fluent软件对急冷塔进行气-液两相流的数值模拟试验研究。模拟计算喷射锥角、液滴直径和喷水量、烟气量及入... 固体废物焚烧烟气急冷塔是控制二噁英类污染的一种常用设备,急冷塔的液滴蒸发效率和降温效果是抑制二噁英生成的关键因素。利用fluent软件对急冷塔进行气-液两相流的数值模拟试验研究。模拟计算喷射锥角、液滴直径和喷水量、烟气量及入口温度等运行参数,最终总结出该急冷塔的运行操作范围;确定喷嘴型号和操作范围;喷水量范围为0.4~0.5 kg/s,急冷塔适用的烟气工况范围。 展开更多
关键词 FLUENT 急冷塔 数值模拟 运行参数优化
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Calculation of Surrounding Rock Pressure of Undercut Subway Station Based on Multi-Factor Affecting Pressure Arch Theory 认领
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作者 Bin Shang Xiaoguang Jin +2 位作者 Guiyong Ao Qiao Chen Qiong Qiu 《工程(英文)(1947-3931)》 2020年第2期59-70,共12页
The formation mechanism of surrounding rock pressure in large-section tunnels of underground excavation is still unclear. The traditional methods for calculating surrounding rock pressure have certain limitations. Bas... The formation mechanism of surrounding rock pressure in large-section tunnels of underground excavation is still unclear. The traditional methods for calculating surrounding rock pressure have certain limitations. Based on the theory of pressure arch and parameter sensitivity analysis, the internal and external boundaries of the pressure arch are solved by numerical simulation. The loose pressure is obtained according to the distance from the inner boundary to the inner wall of the tunnel. The pressure arch deformation is analyzed based on the Winkler model. The surrounding rock pressure is calculated, and the surrounding rock pressure based on the pressure arch theory is calculated. The calculation method of surrounding rock pressure based on the pressure arch theory large section tunnel is proposed. The orthogonal experimental design method was used to select four representative factors: tunnel depth H, span B, internal friction angle φ and rock weight γ. The calculation results of each group of experiments were compiled and multivariate linear regression was used. The method is statistically analyzed, and finally, the calculation formula of the surrounding rock pressure of the large-section tunnel affected by multiple factors is obtained and applied to the calculation of the surrounding rock pressure of the metro station. 展开更多
关键词 PRESSURE ARCH THEORY Sensitivity Analysis SURROUNDING Rock PRESSURE Orthogonal Test Numerical Simulation
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Study of Internal Waste Dump-Induced Shear Stress Behavior on Pit-Slope 认领
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作者 Sugeng Wahyudi Hideki Shimada +5 位作者 Takashi Sasaoka Akihiro Hamanaka Tsedendorj Amarsaikhan Pisith Mao Tumelo K. M. Dintwe Dyson Moses 《地球科学和环境保护期刊(英文)》 2020年第4期71-86,共16页
Regardless of beneficial associated with internal waste dump (IWD) method, practices of this method within boundaries of pit-slope have some serious problems on stability issues due to this area is zone of potential f... Regardless of beneficial associated with internal waste dump (IWD) method, practices of this method within boundaries of pit-slope have some serious problems on stability issues due to this area is zone of potential failure. This zone is known as dynamic reactive zone which is easy to deform by external force, and inherent dangers of failure posing a threat to slope. Therefore, it is paramount to study the induced shear stress behavior in this zone particularly when IWD method is adopted within this zone. In this paper, a numerical study for investigating IWD-induced shear stress behavior has been carried out using Finite Element Method (FEM) with Strength Reduction approach. Different scenarios as per pit-slope depths, IWD heights and buffer zone lengths have been accounted and simulated using PHASE 2 to understand changes in induced shear stress imposed on the pit-slope. It is found that shear stress imposed on pit slope seems change dramatically with increasing IWD height for case of buffer zone length is less than 100-m-long. 展开更多
关键词 SLOPE Stability INTERNAL WASTE DUMP SHEAR-STRESS Numerical Simulation
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Study on the Effective Range of Local Ventilation in the Driving Face of Single Head Roadway 认领
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作者 Yuanwei Hao Yong Wang 《世界工程和技术(英文)》 2020年第1期50-59,共10页
The traditional research considers that the effective range of forced local ventilation in single head tunnel is the horizontal distance from the jet exit section to the rotary section, but there is a low wind speed a... The traditional research considers that the effective range of forced local ventilation in single head tunnel is the horizontal distance from the jet exit section to the rotary section, but there is a low wind speed area at the end of the range which can not completely and effectively release toxic and harmful gases. In this area, due to the small jet energy, there is no way to effectively remove the toxic and harmful gases produced in the driving process, which seriously affects the safety of the mine.?Therefore, the reasonable definition of the effective range of the forced local ventilation of the single head tunnel can not only improve the theory of the local ventilation of the mine, but also prevent the accumulation of gas and ensure the life safety of the employees. In this paper, the definition of effective range of local ventilation in single head heading face is put forward, and the rationality of the definition of effective range is verified by numerical simulation. On the basis of reasonable definition of effective range, the relationship between wind speed and effective range under different ventilation modes is studied by numerical simulation. The results show that when the wind speed at the outlet of the air duct is less than 20 m/s, the effective range changes rapidly with the outlet wind speed, and after more than 20 m/s, the effect of wind speed on the effective range is gradually weakened. Under the same exit wind speed, the effective range of parallel and coplanar air inlet is much greater than that of single air inlet. 展开更多
关键词 EFFECTIVE RANGE Numerical Simulation TUNNELING Ventilation WIND SPEED Ventilation Pattern
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Numerical Simulation of the Relationship between the Width of Destressed Zone and Blasthole Depth 认领
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作者 Jiansheng Tian Qingru Wu Zhijun Liu 《工程(英文)(1947-3931)》 2020年第4期269-279,共11页
Overstress in the surrounding rock of the roadway is a key reason that causes failures of deep roadways. Destressing blasting is one of the promising techniques that could improve the supporting quality. If the depth ... Overstress in the surrounding rock of the roadway is a key reason that causes failures of deep roadways. Destressing blasting is one of the promising techniques that could improve the supporting quality. If the depth of the pressure relief blast hole is too shallow, the surrounding rock of the roadway will be broken or even collapsed. If the pressure relief blast hole is too deep, the pressure relief area will be located in the deep part of the surrounding rock of the roadway, which cannot achieve the purpose of releasing the stress in the shallow part of the surrounding rock and cause waste of the blast hole. The width or range of the pressure relief area should just fall in the high stress area of the surrounding rock of the roadway, so the pressure relief blast hole should have a reasonable depth. In order to quantitatively describe the relationship between borehole depth and the width of the stress relief zone, numerical simulations were carried out in ANSYS according to different borehole depths. The results show that the optimal destressing effect is achieved when borehole depth is 4 m. Peak stress of and is significantly reduced by 30.51% and 49.07% after blasting. Meanwhile, the high-stress area shifts about 4.8 m from the roadside to the depth of surrounding rock, thus a 3.8 m wide stress relief zone is formed around the roadside, thus, the aim of quantizing the effects of destress blasting is achieved. 展开更多
关键词 Rock BURST Deep ROADWAY Supporting WIDTH of Stress RELIEF ZONE Destress BLASTING Numerical Simulation
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A Simplified Numerical Approach for Simulating Electromagnetic Propulsion 认领
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作者 Kaichen Wang Ruiwen Chen 《电磁分析与应用期刊(英文)》 2020年第1期1-5,共5页
Electromagnetic propulsion provides a non-contact way for delivering goods. The projectile typically does not contain explosives, which has apparent advantages over traditional methods. Due to the multi-physics nature... Electromagnetic propulsion provides a non-contact way for delivering goods. The projectile typically does not contain explosives, which has apparent advantages over traditional methods. Due to the multi-physics nature, simulation is expensive and time-consuming. We established a simplified model in time domain incorporating mechanics and electromagnetics to study electromagnetic propulsion. Results show that important physical parameters such as force, velocity, acceleration, etc. can be extracted from the model without time-consuming efforts. We hope this model could help the exploration of electromagnetic propulsion. 展开更多
关键词 ELECTROMAGNETIC PROPULSION GAUSSIAN LAW NUMERICAL Simulation
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Experimental and Numerical Investigation of Swirling Flow on Triple Elbow Pipe Layout 认领
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作者 Hideharu Takahashi San Shwin +2 位作者 Ari Hamdani Nobuyuki Fujisawa Hiroshige Kikura 《流量控制、测量及可视化(英文)》 2020年第2期45-62,共18页
The secondary flow downstream of a triple elbow layout was studied experimentally and numerically to visualize the flow behavior under swirling inlet flow conditions. The inlet swirling condition was generated by a sw... The secondary flow downstream of a triple elbow layout was studied experimentally and numerically to visualize the flow behavior under swirling inlet flow conditions. The inlet swirling condition was generated by a swirl generator, consisting of a rotary pipe and honeycomb assembly. The experiments were carried out in turbulent water flow condition at Reynolds number Re = 1 × 104 and inlet swirl intensity S = 1. Ultrasonic measurements were taken at four locations downstream of the third elbow. The two-dimensional velocity field of the flow field was measured using the phased array ultrasonic velocity profiler technique to evaluate the flow field with separation. Furthermore, a numerical simulation was performed and its results were compared with the experimental data. The numerical result was obtained by solving three-dimensional, Reynolds-averaged Navier-Stokes equations with the renormalization group k-ε turbulence model. The experimental results confirmed that the swirling flow condition modified the size of the separation region downstream of the third elbow. A qualitative comparison between the experimental and CFD simulation results of the averaged velocity field downstream of the third elbow showed similar tendency on reverse flow. 展开更多
关键词 Swirling Flow TRIPLE ELBOW ULTRASOUND Phased ARRAY Sensor VELOCITY Profile CFD Numerical Simulation
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海底电缆电磁场分布模拟与分析 认领
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作者 甘团杰 陈剑平 +2 位作者 杨玺 周庆东 曾亮 《物探与化探》 CAS 北大核心 2020年第3期550-558,共9页
海底电缆的探测和识别技术是海底电缆维护与建设中非常重要的研究内容。海底电缆布设于海底,在通电情况下产生电场和磁场,符合可控源电磁法探测理论。本文采用频率域可控源电磁法2.5维高精度有限元数值模拟算法对海底电缆模型进行模拟... 海底电缆的探测和识别技术是海底电缆维护与建设中非常重要的研究内容。海底电缆布设于海底,在通电情况下产生电场和磁场,符合可控源电磁法探测理论。本文采用频率域可控源电磁法2.5维高精度有限元数值模拟算法对海底电缆模型进行模拟与分析研究,以水平地形和起伏地形海底电缆模型为基础,重点对海水层厚度和海底界面两种参数变化前后电磁场分布特征进行了模拟与分析。数值算例表明:磁场分量H y对于海水层厚度非常敏感,厚度变化0.2 m时,变化前后H y偏差可达5%,从而论证了采用可控源电磁法理论对于海底电缆的探测和识别可行。 展开更多
关键词 海洋探测 电磁场 海底电缆 数值模拟 可控源电磁法
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基于CFD的赣南住宅风环境模拟系统设计 认领
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作者 蔡丽蓉 张红婴 《现代电子技术》 北大核心 2020年第18期121-124,共4页
风环境的情况关系到居住体验,所以设计基于CFD的赣南住宅风环境模拟系统,提高居民居住质量。考虑到受热压和风压影响的自然通风原理,在风环境模拟系统中利用CFD数值模拟分析赣州于都县恒大御景小区风环境的流场湍流特性,将该特性和住宅... 风环境的情况关系到居住体验,所以设计基于CFD的赣南住宅风环境模拟系统,提高居民居住质量。考虑到受热压和风压影响的自然通风原理,在风环境模拟系统中利用CFD数值模拟分析赣州于都县恒大御景小区风环境的流场湍流特性,将该特性和住宅建筑风流场模型导入建筑通风斯维尔Vent 2018软件后,展开住宅风环境的三维流动数值模拟,确立住宅风环境的来流面边界条件以及出流面边界条件,确保住宅风环境模拟更加真实。同时,从建筑平面布局、建筑通风窗设计以及热压通风三方面研究恒大御景小区自然通风设计策略。通过模拟实验得出该小区夏季住宅外风速小于等于4.9 m/s,风速最大值为4.621 m/s,冬季迎风面与背风面的风压分别为4.903 Pa和-3.749 Pa,并且有效模拟该小区风速同人体舒适度关系,分析小区各季节的风环境舒适度。 展开更多
关键词 风环境模拟 系统设计 CFD 数值模拟 自然通风设计 模拟实验
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典型山丘地形与风力机诱导涡流耦合演变规律 认领
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作者 史俊杰 许昌 +3 位作者 雷娇 李林敏 薛飞飞 韩星星 《机械工程学报》 EI CAS CSCD 北大核心 2020年第4期85-94,共10页
风电场空气动力场是以涡流形式产生和演变,采用能够提供涡流演变细节特征的大涡模拟(Large eddy simulation,LES)方法模拟典型山丘地形的涡流结构,通过风洞试验数据验证湍动能输运(Kinetic energy transport,KET)模型模拟结果的准确性,... 风电场空气动力场是以涡流形式产生和演变,采用能够提供涡流演变细节特征的大涡模拟(Large eddy simulation,LES)方法模拟典型山丘地形的涡流结构,通过风洞试验数据验证湍动能输运(Kinetic energy transport,KET)模型模拟结果的准确性,并探讨不同入流风速对山丘地形风电场瞬时特性的影响。随后探索地形诱导涡与风力机尾涡耦合的时空演化机制,发现单台风力机与两台并列风力机工况的尾涡结构的耦合演变机理存在差异,单台风力机工况是由于二次涡的形成及其与尾涡的耦合作用,两台并列风力机则归因于二次涡与尾涡的耦合及两机组间涡流耦合的共同作用。针对复杂地形涡流演变的研究可以为风电场规划设计与运行提供参考。 展开更多
关键词 致动盘 涡流耦合 大涡模拟(Large eddy simulation LES) 数值模拟
文章速递中厚煤层无煤柱开采回采巷道支护技术研究与应用 认领
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作者 田剑舟 《煤矿现代化》 2020年第6期13-16,共4页
为提高曙光煤矿采煤工作面采出率、巷道利用率,设计在1232工作面进行切顶卸压沿空留巷技术应用试验,通过理论分析计算、数值模拟研究等方法,确定1232运巷合理切顶高度为9m,切缝线与垂直方向呈15°角布置,数值模拟分析优选最佳支护方... 为提高曙光煤矿采煤工作面采出率、巷道利用率,设计在1232工作面进行切顶卸压沿空留巷技术应用试验,通过理论分析计算、数值模拟研究等方法,确定1232运巷合理切顶高度为9m,切缝线与垂直方向呈15°角布置,数值模拟分析优选最佳支护方案,现场应用期间,留巷围岩整体稳定,切顶卸压自动成巷技术成功在曙光煤矿应用。 展开更多
关键词 切顶 恒阻大锚索 数值计算 数值模拟
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柔性网膜展开过程的数值分析 认领
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作者 王全 陈俊 +2 位作者 陈曦 付杰 石益建 《机械科学与技术》 CSCD 北大核心 2020年第6期966-971,共6页
柔性网膜由柔性薄膜和凯夫拉绳编织而成,对其展开过程进行研究。首先,通过理论分析,建立柔性网膜的数值模型。其次,基于柔性网膜的仿真模型,得到数值模型位移系数和飞行距离系数。最后,由单因素敏感性分析法研究特征因素对数值模型的影... 柔性网膜由柔性薄膜和凯夫拉绳编织而成,对其展开过程进行研究。首先,通过理论分析,建立柔性网膜的数值模型。其次,基于柔性网膜的仿真模型,得到数值模型位移系数和飞行距离系数。最后,由单因素敏感性分析法研究特征因素对数值模型的影响,得到了柔性网膜展开规律。利用仿真结果对数值模型计算结果进行验证,结果吻合较好,相对误差小于15%。数值模型结果表明,随着发射速度和螺旋角的增加,展开面积和最大展开面积增加;随着发射速度的增加,飞行距离增加,最大展开面积对应的飞行距离增加,螺旋角对飞行距离影响较小;发射速度越大、螺旋角越大,柔性网膜展开越快。 展开更多
关键词 柔性网膜 数值分析 仿真模型 单因素敏感性分析
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箱涵顶进施工过程中路面沉降的数值模拟分析 认领
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作者 周广友 李聪 +2 位作者 胡勇 龚虎 林宇亮 《公路工程》 北大核心 2020年第3期29-37,共9页
采用FLAC 3D数值软件对某箱涵顶进工程实例进行了施工全过程的数值模拟,并结合路面沉降的现场监测数据对数值模拟得出的路面沉降规律进行了总结分析。研究表明:顶进施工确实会造成路面沉降,在保证顶进施工过程中不出现超挖土体的情况下... 采用FLAC 3D数值软件对某箱涵顶进工程实例进行了施工全过程的数值模拟,并结合路面沉降的现场监测数据对数值模拟得出的路面沉降规律进行了总结分析。研究表明:顶进施工确实会造成路面沉降,在保证顶进施工过程中不出现超挖土体的情况下,路面沉降的最大值为40 mm左右,最大值处于箱涵中轴线正上方,沉降值由箱涵中轴线向两边递减,路面沉降的影响范围约为箱涵宽度的1倍。在正常状况下顶进施工造成的路面沉降处于允许的沉降范围内,能很好地保证公路的正常通行。 展开更多
关键词 箱涵顶进施工 FLAC 3D软件 数值模拟 路面沉降
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拆除爆破数值模拟中钢筋混凝土构件的建模及参数取值方法 认领
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作者 孙金山 贾永胜 +2 位作者 姚颖康 刘昌邦 黄小武 《爆破》 CSCD 北大核心 2020年第3期115-121,共7页
采用数值模拟方法对钢筋混凝土结构的拆除爆破方案进行分析时,数值模型的简化和参数的选择对模拟结果和计算效率的影响十分显著,这影响拆除爆破数值模拟结果的可靠性。根据目前有限元法的技术水平,对钢筋混凝土构件数值模型的典型建模... 采用数值模拟方法对钢筋混凝土结构的拆除爆破方案进行分析时,数值模型的简化和参数的选择对模拟结果和计算效率的影响十分显著,这影响拆除爆破数值模拟结果的可靠性。根据目前有限元法的技术水平,对钢筋混凝土构件数值模型的典型建模方法进行了评价,建议在建立大型数值模型时可忽略箍筋,但需考虑箍筋对素混凝土极限强度和应变的影响。基于拆除爆破现场试验数据,分析了楼房支撑区钢筋混凝土立柱的应变时程曲线和应变率时程曲线。实验结果显示:构件破坏过程中应变率存在强烈的波动性。数值模拟中采用应变率相关的本构模型时,应变率的强烈波动可能导致材料性能变化过于复杂,因此建议可采用应变率不相关本构模型,并应根据结构破坏阶段的平均应变率对材料参数进行取值。综合考虑箍筋效应和应变率效应,提出了拆除爆破数值模拟时混凝土和钢筋的参数确定方法,以及以最大应变为主的单元失效控制方法。 展开更多
关键词 拆除爆破 数值模型 建模方法 材料参数取值 单元失效控制
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基于中尺度数值大气模式的海雾特征参数研究 认领
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作者 龙胤宇 陈慧敏 +1 位作者 王凤杰 陆长平 《兵工学报》 EI CAS CSCD 北大核心 2020年第3期507-516,共10页
为了研究掠海激光类武器在海雾气溶胶环境下的回波特性,需要进一步获取海雾气溶胶的特征参数。基于中尺度数值大气模式的天气研究与预报模型,在垂直空间针对海雾所在空间区域设置更为密集的η分层,对2015年4月28日~2015年4月29日的渤海... 为了研究掠海激光类武器在海雾气溶胶环境下的回波特性,需要进一步获取海雾气溶胶的特征参数。基于中尺度数值大气模式的天气研究与预报模型,在垂直空间针对海雾所在空间区域设置更为密集的η分层,对2015年4月28日~2015年4月29日的渤海海雾过程进行数值模拟分析,得到云水混合比、雾顶高度等海雾特征参数的数据,进而计算出影响激光回波的水平能见度数据。研究结果表明:对于海雾所在空间区域(海拔高度400 m以下),增大η分层数能够进一步细化海雾的特征参数,提高获取的数据精度;能见度参数可以通过云水混合比等海雾特征参数推算得到,其精度受海雾参数精度影响。 展开更多
关键词 激光引信 海雾 中尺度数值大气模式 天气研究与预报 云水混合比 能见度 数值模拟 特征参数
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二维黏弹介质五点八阶超紧致有限差分声波方程数值模拟 认领
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作者 周诚尧 汪勇 +1 位作者 桂志先 于晓东 《科学技术与工程》 北大核心 2020年第1期54-63,共10页
首次将五点八阶超紧致有限差分格式(CCD8)用于黏弹介质声波方程的数值模拟中,并对该格式进行了频散分析和精度分析,与普通紧致差分格式进行比较。随后,根据泰勒级数展开黏滞声波方程,建立了位移场时间二阶离散格式,将CCD8用于对位移场... 首次将五点八阶超紧致有限差分格式(CCD8)用于黏弹介质声波方程的数值模拟中,并对该格式进行了频散分析和精度分析,与普通紧致差分格式进行比较。随后,根据泰勒级数展开黏滞声波方程,建立了位移场时间二阶离散格式,将CCD8用于对位移场空间导数的求取,且对CCD8格式进行稳定性研究。最后将CCD8格式运用于均匀介质模型以及水平层状介质模型以及Marmousi模型的数值模拟和波场特征分析及对比中。研究结果表明:①CCD8与CD8相比,具有更小的截断误差、更高的模拟精度以及低数值频散的优点;②CCD8具有较高稳定性;③采用完全匹配层(perfectly matched layer,PML)对人工边界进行处理后对均匀介质、水平层状介质以及Marmousi模型进行黏滞声波方程的数值模拟,发现模拟效果不错,从而验证了CCD8的实用性和有效性性。 展开更多
关键词 五点八阶超紧致差分 黏弹介质声波方程 数值频散 稳定性条件 数值模拟
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基于iS3的复杂地质建模与数值数字一体化研究 认领
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作者 李培楠 石来 +1 位作者 刘俊 李晓军 《重庆交通大学学报:自然科学版》 CAS CSCD 北大核心 2020年第3期142-148,共7页
三维地质建模与数值模拟是地下空间开发重要的分析工具,然而目前地质建模的数据难以简便地应用于数值模拟中,不能准确表征地层的分布是造成数值模拟计算结果可靠性较低的主要原因之一。基于多源数据耦合建模理论,结合钻孔数据、地层接... 三维地质建模与数值模拟是地下空间开发重要的分析工具,然而目前地质建模的数据难以简便地应用于数值模拟中,不能准确表征地层的分布是造成数值模拟计算结果可靠性较低的主要原因之一。基于多源数据耦合建模理论,结合钻孔数据、地层接触约束及地层产状信息,通过借助潜势场方法的协克里金梯度插值法可建立复杂区域的地质模型。将地质模型接入iS3平台,纳入工程统一的信息化管理系统。并通过二次开发,将地质模型的数据与数值模拟相结合,在满足网格质量和模拟复杂的施工工况的要求下,充分考虑地层的空间分布。以南京地铁5号线为应用对象,结果表明:多源数据耦合建模可以较好地揭露盾构穿越段复合地层的空间分布形态,基于iS3平台,可进一步利用地质建模成果,在数值模拟中可以充分考虑地层的不均匀分布,实现数值数字一体化。 展开更多
关键词 地质工程 地质建模 数值模拟 数值数字一体化 iS3平台
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软弱夹层特性对露天矿边坡稳定性影响的应用研究 认领
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作者 杨宫印 崔鹏艳 陈玉明 《矿产与地质》 2020年第1期166-172,共7页
软弱夹层是岩体结构中存在的常见构造之一,明确其各类物理特性对边坡的作用机理,是确保边坡稳定性的首要任务。结合某石英石矿露天边坡实际工程,确定了软弱夹层倾角θ、黏聚力C、内摩擦角φ、厚度D四个物理参数,利用FLAC 3D数值分析软... 软弱夹层是岩体结构中存在的常见构造之一,明确其各类物理特性对边坡的作用机理,是确保边坡稳定性的首要任务。结合某石英石矿露天边坡实际工程,确定了软弱夹层倾角θ、黏聚力C、内摩擦角φ、厚度D四个物理参数,利用FLAC 3D数值分析软件进行数值模拟,系统分析了各物理参数变化对边坡稳定性的影响规律,为防止露天矿边坡失稳、设计治理方案提供可靠的理论依据。 展开更多
关键词 软弱夹层 边坡稳定性 数值模拟 FLAC 3D数值分析软件 影响规律
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