We develop a new numerical model based on a precise integration method to investigate the coupled thermo-mechanical performance of layered transversely isotropic media around a cylindrical/tubular heat source. To obtain the relational matrices of the extended precise integration method, we first convert the governing equations of the problem into ordinary differential matrix equations through the Laplace–Hankel transform. Then, the cylindrical heat source is divided into a series of plane heat sources, and the plane temperature load term is added to the state vector between layer elements. By combining the layer elements, we build a layered transversely isotropic numerical model containing a cylindrical heat source in the transformed domain. Finally, we solve the model in the transformed domain and obtain the solution of the problem in the real domain through the Laplace–Hankel transform inversion. The accuracy of this method is verified by comparing the solutions with the results of the analytical method and the finite element method. Then, we study the influence of the anisotropy of thermal parameters, the embedded depth, the length/radius ratio, the type of heat source and the stratification of the medium on the thermo-mechanical coupled performance.
Journal of Paleolimnology - The Songliao Basin, northeast China, possesses an excellent Cretaceous lake sediment record that provides an opportunity to investigate Cretaceous terrestrial climate... 相似文献
选取2012年4月14日的一次存在东西2片雾区的黄海春季海雾为研究对象,借助WRF（Weather Research and Forecasting）模式,采用循环3DVAR（3-Dimensional Variational）数据同化方案,考虑了湿度控制变量的背景误差协方差CV6,进行了AIRS（Atmospheric Infrared Sounder）卫星温度与湿度廓线数据的同化试验,并基于同化试验结果探讨了此次海雾的形成机制。同化试验结果表明：同化 AIRS 卫星温度与湿度廓线数据后,模式能成功再现海雾的形成过程,特别是东西2片雾区之间的晴空区的存在,这归功于AIRS数据的同化能够显著改善海上大气边界层的温湿结构、影响海雾的低层高压的范围与强度;机制分析揭示：东西2片雾均为典型的平流冷却雾,但二者厚薄和气团来源不同;海上高压控制黄海西岸陆地的暖空气入海,受低海温的冷却作用降温先形成逆温层,然后逆温层底部生成了较薄的西侧雾区;来自黄海中部的空气向东北移动至朝鲜半岛西部海域,高压下沉增温形成一个顶部较高的稳定层,从而生成较厚的东侧雾区;高压中心下沉区内,近海面风速小使得机械湍流弱,空气增温与海温暖舌共同作用下使得近海面气海温差小,海雾无法生成导致了晴空区的存在。 相似文献
