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1.
In this paper, a local mesh refinement (LMR) scheme on Cartesian grids for large‐eddy simulations is presented. The approach improves the calculation of ghost cell pressures and velocities and combines LMR with high‐order interpolation schemes at the LMR interface and throughout the rest of the computational domain to ensure smooth and accurate transition of variables between grids of different resolution. The approach is validated for turbulent channel flow and flow over a matrix of wall‐mounted cubes for which reliable numerical and experimental data are available. Comparisons of predicted first‐order and second‐order turbulence statistics with the validation data demonstrated a convincing agreement. Importantly, it is shown that mean streamwise velocities and fluctuating turbulence quantities transition smoothly across coarse‐to‐fine and fine‐to‐coarse interfaces. © 2016 The Authors International Journal for Numerical Methods in Fluids Published by John Wiley & Sons Ltd 相似文献
2.
用激光磁共振方法研究了氮氧化物与腐殖酸的反应.腐殖酸是一种重要的地表环境物质,氮氧化物是大气中主要的污染源之一,研究它们之间的反应从而了解地表环境物质与大气环境物质的相互作用,表明在一定程度上地表环境能吸收掉一些污染.NO2与胡敏酸反应被消除85%,NO2与富里酸反应被消除90%.NO与胡敏酸反应被消除30%,NO与富里酸反应被消除33%.腐殖酸在消除氮氧化物的同时也将被氧化和硝化形成有机矿物肥料,这些为使用地表环境物质治理工业污染废气提供了有用的数据. 相似文献
3.
氮氧化物火花放电化学反应的激光磁共振(LMR)研究 总被引:3,自引:3,他引:0
自然界的闪电就是一种火花放电,在闪电中有多种放电化学反应过程发生,氮氧化物与其它原子分子的放电化学反应是一个重要方面,利用高灵敏度的LMR方法研究氮氧化物的火花放电反应,NO2的火花放电,发生分解反应生成NO,氮氧化物加水蒸气经放电,反应转变98%的NO2,反应转变80%的NO,加入氨蒸气经放电,能完全反应转变NO2,反应转变90%的NO.这些也为治理大气污染提供了有用的数据. 相似文献
4.
以激光磁共振为手段分别在紫外光照射和火花放电条件下观测了α-蒎烯、β-蒎烯与NO/NO2的化学反应.得到如下结果:α-蒎烯、β-蒎烯在火花放电条件下可与NO/NO2发生化学反应,α-蒎烯-NOx体系的反应比β-蒎烯-NOx体系的反应完全;α-蒎烯、β-蒎烯在紫外光照射下可与NOx发生不很剧烈的化变反应.所获得的信息对了解大气化学反应及光化学烟雾有着重要的意义. 相似文献
5.
LMR spectra for v=1←0 transitions of 14N16O in X2Π1/2,3/2 states were observed at 5.6 μm and 5.4 μm of CO laser. Introducing the advanced isotopic molecular constant scaling function to Hund's case (a) diatomic structure model, these spectra were analyzed and fitted together with all reliable previous spectral data of 14N16O as well as 14N17O and 14N18O. A full set of precise molecular parameters and their vibrational dependencies have been determined with much higher precision (1 -2 orders for most parameters). Many of them have been obtained for the first time. Using isotopic scaling function, the molecular constants of 14N17O and 14N18O were deduced. 相似文献
6.
激光磁共振方法研究异戊二烯与NOx的化学反应 总被引:2,自引:2,他引:0
以激光磁共振为手段分别在紫外照射和火花放电条件下观测到异戊二烯与NO/NO2的反应,所获得的信息对了解大气化学反应及光化学烟雾有着重要的意义。 相似文献
7.
Liu Yuyan Liu Hongping Guo Yuanqing Liu Xiaoyong Lin Jieli Huang Guangming Gao Hui Li Jinrui 《中国科学B辑(英文版)》2000,43(2):121-128
LMR spectra for v=1←0 transitions of14N16O in X2II1/2, 3/2 states were observed at 5.6 μm and 5.4 μm of CO laser. Introducing the advanced isotopic molecular constant scaling function
to Hund’s case (a) diatomic structure model, these spectra were analyzed and fitted together with all reliable previous spectral
data of14N16O as well as14N17O and14N18O. A full set of precise molecular parameters and their vibrational dependencies have been determined with much higher precision
(1–2 orders for most parameters). Many of them have been obtained for the first time. Using isotopic scaling function, the
molecular constants of14N17O and14N18O were deduced. 相似文献
8.
用激光磁共振方法研究了氮氧化物与腐殖酸的反应.腐殖酸是一种重要的地表环境物质,氮氧化物是大气中主要的污染源之一,研究它们之间的反应从而了解地表环境物质与大气环境物质的相互作用,表明在一定程度上地表环境能吸收掉一些污染.NO2与胡敏酸反应被消除85%,NO2与富里酸反应被消除90%.NO与胡敏酸反应被消除30%,NO与富里酸反应被消除33%.腐殖酸在消除氮氧化物的同时也将被氧化和硝化形成有机矿物肥料,这些为使用地表环境物质治理工业污染废气提供了有用的数据. 相似文献
9.
Mateusz
mietana Pawe Niedziakowski Wioleta Biaobrzeska Dariusz Burnat Petr Sezemsky Marcin Koba Vitezslav Stranak Katarzyna Siuzdak Tadeusz Ossowski Robert Bogdanowicz 《Electroanalysis》2019,31(2):398-404
In this work an optical fiber sensor, where a lossy‐mode resonance (LMR) effect was obtained due to indium tin oxide (ITO) thin overlay, has been simultaneously applied as a working electrode in a 3‐electrode cyclic voltammetry electrochemical setup. Since LMR conditions highly depend on refractive index of a surrounding medium, an LMR‐based sensor was applied for optical investigations of electrolyte's properties at the ITO surface. We have found that the optical response of the sensor highly depends on the applied potential and its changes, as well as the properties of the investigated electrolyte, i. e., its composition and presence of a redox probe. Both optical and electrochemical response of the ITO‐LMR sensor to various concentrations of phosphate‐buffered saline (PBS), NaCl and Na2SO4, as well as scan rate were investigated and discussed. We have found that the responses in optical and electrical domains differ significantly and may deliver supplementary information about the investigated analyte. 相似文献
10.
根据塞曼效应理论和激光磁共振光谱技术(LMR)的基本原理,讨论了双原子分子2∏态的塞曼效应特性并导出了解释分子塞曼跃迁的简明代数拟合方程,用这些方程对14N16O(X2∏1/2.3/2)及15N16O(X2∏3/2)(v=1←0)的LMR谱线进行数据拟合,得到塞曼跃迁上、下子能级的gJ因子值和二级塞曼效应因子k2.将按Hund耦合情形(a)及过渡情形(ab)的理论和拟合方程计算出的磁场位置分别与实验结果相比较,结果表明对NO分子而言,过渡情形(ab)能较真实反映它的耦合情况,且在较高强度磁场下,必须计及二级塞曼修正验证了采用上述代数拟合方程实现新分子LMR谱线标识和指认的可靠性,并提供了系统的处理方法. 相似文献