中文图文电视广播系统(Chinese Character System Teletext),简称“CCST”,在我国已迈进实用阶段,现有二十多个省、市相继开始了图文电视广播。所谓“图文电视”,我们不能简单地理解成通常在电视节目中所看到的字幕或静止图象,它是一种...中文图文电视广播系统(Chinese Character System Teletext),简称“CCST”,在我国已迈进实用阶段,现有二十多个省、市相继开始了图文电视广播。所谓“图文电视”,我们不能简单地理解成通常在电视节目中所看到的字幕或静止图象,它是一种利用电视信道进行数据广播的崭新技术,即在现有的电视广播网上,将各种信息的文字、图形加以编码,转换成数字脉冲,在播送正常电视节目的同时,通过“多工装置”,插入全电视信号空闲行(多工数据行)之中,以合成的视频信号去调制图象发射机。展开更多
Quadtree-based Cartesian grid was automatically generated from specified geometry.Adaptive refinements were performed according to geometric parameters and solution of flow field.An altered CCST(curvature corrected sy...Quadtree-based Cartesian grid was automatically generated from specified geometry.Adaptive refinements were performed according to geometric parameters and solution of flow field.An altered CCST(curvature corrected symmetry technique)approach was proposed to apply solid wall boundary conditions. Driven flows in a square cavity and flows around NACA0012airfoil were simulated and compared with the result of published structured grid and stretched Cartesian grid.The results show that solid wall boundary condition are accurately applied by current altered CCST approach,while incompressible/compressible subsonic, transonic and supersonic viscous flows are adequately simulated with adaptively refined Cartesian grid.展开更多
文摘中文图文电视广播系统(Chinese Character System Teletext),简称“CCST”,在我国已迈进实用阶段,现有二十多个省、市相继开始了图文电视广播。所谓“图文电视”,我们不能简单地理解成通常在电视节目中所看到的字幕或静止图象,它是一种利用电视信道进行数据广播的崭新技术,即在现有的电视广播网上,将各种信息的文字、图形加以编码,转换成数字脉冲,在播送正常电视节目的同时,通过“多工装置”,插入全电视信号空闲行(多工数据行)之中,以合成的视频信号去调制图象发射机。
文摘Quadtree-based Cartesian grid was automatically generated from specified geometry.Adaptive refinements were performed according to geometric parameters and solution of flow field.An altered CCST(curvature corrected symmetry technique)approach was proposed to apply solid wall boundary conditions. Driven flows in a square cavity and flows around NACA0012airfoil were simulated and compared with the result of published structured grid and stretched Cartesian grid.The results show that solid wall boundary condition are accurately applied by current altered CCST approach,while incompressible/compressible subsonic, transonic and supersonic viscous flows are adequately simulated with adaptively refined Cartesian grid.
