本文選題：亞網(wǎng)格技術(shù) + 時(shí)域有限差分法��； 參考：《西安電子科技大學(xué)》2015年碩士論文

【摘要】：本文主要分析了兩類亞網(wǎng)格技術(shù)的具體實(shí)現(xiàn)方式以及其性能的提升方案。作為一種簡(jiǎn)便有效的計(jì)算方法,時(shí)域有限差分方法(Finite-Difference-Time-Domain,FDTD)在計(jì)算目標(biāo)電磁散射特性方面有著天然的優(yōu)勢(shì),通常FDTD方法在模擬目標(biāo)外觀特征時(shí)采用的都是具有固定尺寸的均勻網(wǎng)格,但這種處理方式在面對(duì)具有精細(xì)結(jié)構(gòu)的電大尺寸目標(biāo)時(shí),必然會(huì)帶來內(nèi)存的大量消耗和計(jì)算效率的下降。基于此,一種有效的處理方案—亞網(wǎng)格技術(shù)應(yīng)運(yùn)而生,即對(duì)目標(biāo)主體部分采用較粗的網(wǎng)格,精細(xì)部分采用較細(xì)的網(wǎng)格,這樣的網(wǎng)格剖分方式能將所有的資源都物盡其用,大大提升計(jì)算的性能。不同的粗細(xì)網(wǎng)格邊界處理方法誕生了不同的亞網(wǎng)格技術(shù),本文就首先分別詳細(xì)介紹了基于波動(dòng)方程和線性插值的兩類亞網(wǎng)格實(shí)現(xiàn)原理,并給出了相應(yīng)的散射與輻射算例,數(shù)值結(jié)果表明在這兩種方法下,粗細(xì)網(wǎng)格邊界都有著很低的反射率,程序穩(wěn)定且結(jié)果正確有效。接著簡(jiǎn)要說明了幾種常見的FDTD建模方法,包括簡(jiǎn)單幾何建模、型值點(diǎn)法、三角面元,并重點(diǎn)分析了如何將亞網(wǎng)格技術(shù)同投影求交法結(jié)合起來實(shí)現(xiàn)亞網(wǎng)格復(fù)雜模型的建模,并給出相應(yīng)的電磁散射算例表明該方法的正確性。為了進(jìn)一步提升亞網(wǎng)格計(jì)算的性能,以適應(yīng)大規(guī)模并行計(jì)算的現(xiàn)實(shí)需求,本文在最后探討了基于MPI和OpenMP的亞網(wǎng)格并行實(shí)現(xiàn)方式,大大提升了亞網(wǎng)格技術(shù)的計(jì)算能力。
[Abstract]:In this paper, the implementation of two subgrid technologies and their performance enhancement schemes are analyzed. As a simple and effective calculation method, Finite-Difference-Time-Domain-FDTD (FDTD) has a natural advantage in calculating the electromagnetic scattering characteristics of a target. In general, the FDTD method uses uniform mesh with fixed size when simulating the external features of the target. However, in the face of electrically large size targets with fine structure, this method will inevitably lead to a large amount of memory consumption and a decrease in computational efficiency. Based on this, a kind of effective processing scheme, sub-grid technology, emerges as the times require, that is, the coarse grid is used for the main part of the target body, and the fine part is used for the finer grid. This kind of mesh generation method can make the best use of all the resources. Greatly improved computing performance. Different methods of coarse and fine mesh boundary processing have different subgrid techniques. In this paper, the realization principles of two submeshes based on wave equation and linear interpolation are introduced in detail, and the corresponding scattering and radiation examples are given. Numerical results show that both methods have low reflectivity and the program is stable and the results are correct and effective. Then several common FDTD modeling methods are briefly introduced, including simple geometric modeling, value point method, triangular plane, and how to combine subgrid technology with projection intersection method to realize the modeling of complex subgrid model is analyzed. An example of electromagnetic scattering is given to show the correctness of the method. In order to further improve the performance of sub-grid computing to meet the practical needs of large-scale parallel computing, this paper finally discusses the implementation of sub-grid parallel based on MPI and OpenMP, which greatly improves the computing capability of sub-grid technology.
【學(xué)位授予單位】：西安電子科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：O441.4

【參考文獻(xiàn)】

相關(guān)期刊論文 前8條

1 徐藻;王毅;李琳;曹群生;;基于MPI的FDTD并行算法及其優(yōu)化策略[J];計(jì)算機(jī)仿真;2009年03期

2 李正浩;周俊;劉大剛;;基于OpenMP的電磁場(chǎng)FDTD并行程序性能分析[J];現(xiàn)代電子技術(shù);2008年14期

3 楊利霞;葛德彪;白劍;張世田;;三角面元數(shù)據(jù)模型FDTD網(wǎng)格生成技術(shù)[J];西安電子科技大學(xué)學(xué)報(bào);2007年02期

4 葛德彪;楊利霞;;各向異性介質(zhì)FDTD分析及其并行計(jì)算[J];系統(tǒng)工程與電子技術(shù);2006年04期

5 鄭奎松,葛德彪,葛寧;三維電磁散射的網(wǎng)絡(luò)并行FDTD計(jì)算和加速比分析[J];電波科學(xué)學(xué)報(bào);2004年06期

6 張玉,宋健,梁昌洪;并行共形FDTD算法及其在PBG結(jié)構(gòu)仿真中的應(yīng)用[J];電子學(xué)報(bào);2003年S1期

7 薛正輝,楊仕明,高本慶,張澤杰;FDTD算法的網(wǎng)絡(luò)并行運(yùn)算實(shí)現(xiàn)[J];電子學(xué)報(bào);2003年12期

8 閆玉波,葛寧,鄭美艷,葛德彪,田春明;網(wǎng)絡(luò)并行FDTD方法分析電大目標(biāo)電磁散射[J];電子學(xué)報(bào);2003年06期

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本文編號(hào)：1871935