Parallelization of the distinct lattice spring model     

Gao‐Feng Zhao  Jiannong Fang  Liang Sun  Jian Zhao 《国际地质力学数值与分析法杂志》2013,37(1):51-74

The distinct lattice spring model (DLSM) is a newly developed numerical tool for modeling rock dynamics problems, i.e. dynamic failure and wave propagation. In this paper, parallelization of DLSM is presented. With the development of parallel computing technologies in both hardware and software, parallelization of a code is becoming easier than before. There are many available choices now. In this paper, Open Multi‐Processing (OpenMP) with multicore personal computer (PC) and message passing interface (MPI) with cluster are selected as the environments to parallelize DLSM. Performances of these parallel DLSM codes are tested on different computers. It is found that the parallel DLSM code with OpenMP can reach a maximum speed‐up of 4.68× on a quad‐core PC. The parallel DLSM code with MPI can achieve a speed‐up of 40.886× when 256 CPUs are used on a cluster. At the end of this paper, a high‐resolution model with four million particles, which is too big to handle by the serial code, is simulated by using the parallel DLSM code on a cluster. It is concluded that the parallelization of DLSM is successful. Copyright © 2011 John Wiley & Sons, Ltd.  相似文献   

Two-and three-dimensional linear convection in a rotating annulus     

G. T. Greed  K. Zhang 《地球物理与天体物理流体动力学》2013,107(1-2):23-34

Abstract

An exceptional case to the model-independent theory of Knobloch (1995) is presented, by investigating a rotating cylindrical annulus of height H and side wall radii r _o and r _i, with non-slip, perfectly thermally conducting side walls and thermally insulating stress-free ends. Radial heating permits the possibility of either two- or three-dimensional convective solutions being the preferred mode. An analytical solution is obtained for the two-dimensional case and a numerical solution for the three-dimensional solution, which is also applied to the two-dimensional solution. It is shown that both two- and three-dimensional solutions can be realized depending on the aspect ratio, γ = H/d, where d = r _o-r _i is the thickness of the annulus, the radii ratio λ = r _i/r _o and the rotation rate of the model. For γ = O(1) and λ = 0.4, the preferred convective solution is three-dimensional when the Taylor number, T < 10² and two-dimensional for T > 10². For small aspect ratios, γ ? 1, the preferred mode is two-dimensional for all rotation rates.  相似文献   

柴达木盆地岩石热导率的饱水试验研究及热流校正     

杨淑贞  张文仁 《岩石学报》1993,9(2):199-204

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沁县七星泉天然矿泉水水质特征     

李荣生 《华北地质矿产杂志》1994,9(4):405-410

沁县七星泉（后泉）饮用天然矿泉水是山西发现最早的天然矿泉水之一。１９８７年１１月经国家级鉴定为低钠、低矿化度、锶重碳酸－钙镁型饮用天然矿泉水。可作为瓶装天然矿泉水及矿泉饮料用水予以开发。  相似文献   

内蒙古敖脑达坝斑岩型铜银锡多金属矿床围岩蚀变特征研究   总被引：1，自引：0，他引：1  

赵元芝  程泽君 《吉林地质》1994,13(2):57-62

在给出明确的命名原则基础上，将矿床的蚀变围岩划分为五类：黄玉石英交代岩、绿泥石石英交代岩、绢云母石英交代岩、电气石绿泥石化花岗斑岩、钾长石化花岗斑岩。在平面上岩体中心部位为黄玉石英蚀变带，其两侧为绿泥石石英蚀变带；在剖面上由上向下依次出现绿泥石石英蚀变带→黄玉石英蚀变带→绢英岩化带→钾化带→（电气石）绿泥石化带。从蚀变岩石地球化学角度阐述了铜银锡各自不同的成矿部位。  相似文献   

秦岭泥盆系层控铅锌矿床成因模式探讨     

黄书俊  曾永超 《矿产与地质》1991,(3)

在论述秦岭泥盆系层控铅锌矿床的黄铁矿微量元素,硫、铅、氢、氧同位素,矿物气液包裹体均一温度及成分.区域地层元素丰度等方面特征的基础上,提出了该类型属海底含矿热泉溢出沉积和隐伏含矿热泉贯入沉淀的成因模式.  相似文献   

Temperature dependence of thermal conductivity and its impact on assessments of heat flux     

I. Lerche 《Pure and Applied Geophysics》1991,136(2-3):191-200

The variability of sedimentary thermal conductivities with increasing temperature are explored for their impact on estimates of present-day heat flux and subsurface temperature gradient. For sand thicknesses less than about 10–20 km, or shale thicknesses less than about 40–80 km, the subsurface temperature is closely linearly proportional to the thermal resistance integral obtained in the absence of the temperature dependence of thermal conductivity. Estimates of heat flux should be increased (decreased) by about 5% for sands and decreased by about 1% for shales. For salt, because of the much shorter temperature range over which its thermal conductivity decreases, effects produced by the temperature dependence are more noticeable: heat flux should be increased by around 13%, salt thicknesses in excess of 5 km will yield major (around 30–100°C) changes in their temperature regimes solely as a consequence of the temperature-dependent thermal conductivity, and the linear increase of temperature with increasing thermal resistance is not an adequate approximation but has to be replaced with a more exact exponential increase.The impact of the variations, particularly in the case of salt, for geologic processes is briefly considered.  相似文献   

东西风廓线特征与大气运动平衡态定常波的相关关系及共振条件的研究   总被引：4，自引：0，他引：4  

徐祥德  朱复成  陆曼云 《高原气象》1991,(2)

本文采用简化数学模型探讨了东、西风廓线特征与外源强迫下大气环流平衡态定常波结构的相关关系。文中采用实际观测资料研究了西风廓线特征与大气环流型季节特征之间的联系。研究表明,西风廓线冬、夏季节差异与中、高纬度西风槽“冬三夏四”波数差气候特征有关,且低纬强东风切变可作为赤道东风波周期振荡成因之一。冬夏西风廓线季节特征可导致大地形强迫效应、海陆加热因子影响作用的显著季节差异。研究还揭示了大气环流型优势波转换的基流特征影响效应,并导出了流场与纬向加热强迫源共振状态的西风廓线特征函数与临界曲线。  相似文献   

松辽盆地地热场   总被引：3，自引：0，他引：3  

吴乾蕃 《地震研究》1991,14(1):31-40

本文实测了65口井的地热数据,从中取得17个大地热流值,松辽盆地地热场具有中部高边部低,并呈环状分布,该区地热具有高特征的地质发展历史。分区计算盆地的沉积岩层、花岗岩质层和玄武岩质层各底部的温度和热流值,也都具有中部高边部低的变化趋势。分析了盆地地热场受影响的状况和地热高的主要原因。还分析了盆地地热场与构造活动性、地震活动性、重磁力场、岩石圈厚度的关系,以及与石油生成、运移和富集的关系。  相似文献   

春季高原东侧水平稳定层分析   总被引：1，自引：0，他引：1  

朱光宇  吴宝俊  胡圣昌 《大气科学》1991,15(6):70-77

本文利用稠密的探空资料,分析了春季高原东侧的水平稳定层。确定了该稳定层的范围和强度,指出了其温度、湿度和流场特征,并初步探讨了其维持机制。  相似文献