【摘 要】
：
To improve the spectral characteristics of the high-order weighted compact nonlinear scheme (WCNS),optimized flux difference schemes are proposed.The disadvanta
【机 构】
：
College of Aerospace Science and Engineering, National University of Defense Technology,Changsha 410
论文部分内容阅读
To improve the spectral characteristics of the high-order weighted compact nonlinear scheme (WCNS),optimized flux difference schemes are proposed.The disadvantages in previous optimization routines,i.e.,reducing formal orders,or extending stencil widths,are avoided in the new optimized schemes by utilizing fluxes from both cell-edges and cell-nodes.Optimizations are implemented with Fourier analysis for linear schemes and the approximate dispersion relation (ADR) for nonlinear schemes.Classical difference schemes are restored near discontinuities to suppress numerical oscillations with use of a shock sensor based on smoothness indicators.The results of several benchmark numerical tests indicate that the new optimized difference schemes outperform the classical schemes,in terms of accuracy and resolution for smooth wave and vortex,especially for long-time simulations.Using optimized schemes increases the total CPU time by less than 4％.
其他文献
分析了一类分数阶对称金融非线性系统的复杂度特性,利用有限时间同步理论设计控制器,实现了有限时间同步.根据分数阶系统定义和Adomain分解法对该系统的非线性项进行Adomain
鸟类是造物主作品中最美的精灵之一,曾经有多少人垂涎它们靓丽的羽毛,用来装饰自己的帽子,又有人至今还对这种美味趋之若鹜。鸟类生活在人类周围,它们跳跃翱翔,千姿百态,从早到晚,用歌声调剂着环境的枯燥与单调。在城市里,我们对它们居住何处知之甚少,倒是夜巡的流浪猫们最喜欢掏鸟窝。当人们想亲近鸟类时,它们又毫不含糊地跳开或飞走,只留下一抹剪影。这真是一种我们既熟悉又陌生的动物!
那首歌,那支熟悉的旋律,总是响在耳边。小时候,爸爸也偶尔会哼上几句,虽然从来没有唱完,却也让我记住了旋律。长大后,总会在偶然间听到这支歌,或许,对于我们上一辈来说,这支歌是一个时代的情怀。我也曾经在夜晚听着这首歌,梦想着有一天,我和女友漫步在城市的郊外,演绎歌中的内容。那个夜晚,那个森林,那个月光……那个莫斯科郊外的晚上。来到莫斯科,我确实想看看莫斯科郊外的晚上,只是担心晚上到郊外会迷路而不知归途
高频和低频数据的合理使用一直是投资组合领域的重要问题之一.文章将混频的思想引入投资组合策略中,首先利用包含长期信息的低频数据构建CVaR约束,并将其引入基于高频已实现
The aerodynamic performances and flow features of the capsule/rigid disk-gap-band(DGB) parachute system from the Mach number 1.8 to 2.2 are studied. We use the adaptive mesh refinement(AMR), the hybri
Multiplex networks have drawn much attention since they have been observed in many systems,e.g.,brain,transport,and social relationships.In this paper,the non-l
Free convection in hybrid nanomaterial-saturated permeable media is crucial in various engineering applications.The present study aims to investigate the free c
在卑微中开花,是一种过人本事。作家张爱玲在与胡兰成恋爱时,感到当时的自己与胡在学识、阅历、地位等方面的差距,因而在赠胡的照片背后写道:"遇见你我变得很低很低,一直低到尘埃里去,但我的心是欢喜的,并且在那里开出一朵花来。"词语卑微谦恭却掩不住满心欢喜。可是,好景不长,没有珍惜这段感情的胡兰成,拈花惹草,到处留情,张爱玲忍无可忍,决绝地舍去这段情缘。后来胡兰成东奔西逃,如同丧家之犬。而张爱玲这朵在卑微
小学数学教学强调学生思维空间的拓展,实质为创新的过程,就此我认为:一、创设开放、宽松、民主的教学氛围教学是师生共同参与的双边活动,是师生之间的一种特殊交往活动,创设
单桥为序水是向导,我却是顺着一座桥找到了它。桥,叫单桥。至今,仍有许多光环闪烁在桥头。如:京德古御道与滹沱河的交汇处,世界最长不对称石拱桥。选择从单桥出发西行,其一,是想看看上天以水为笔写下的这五百八十七千米的"一"字,是何种文体?原始的陶文?还是篆、隶、行、楷?从未间断过文化传承的国度,当综艺体、浮云体等文体纷至沓来,还会有人在文明和生命萌芽的老河口守望古老的字体吗?山西、河北,从始皇帝言辞藏刀