numerical dispersion 中文意思是什麼
numerical dispersion
解釋
數值彌散- numerical : adj 數字的；數值的；用數字表示的。 （a） numerical order 號數。 a numerical statement 統計。 the ...
- dispersion : n 1 分散，散開；散布，傳播；離散。2 【物理學】彌散，色散；【化學】分散作用；被分散物；分散相，分...
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The numerical method for the inverse problem of second - dimensional advection - dispersion - reaction equations is discussed in the article
摘要討論了一類二維對流反應擴散方程反問題的數值解法。 -
In this paper, high - order accurate weighted essentially non - oscillatory ( weno ) schemes are investigated and their applications in hyperbolic conservation laws are discussed. based on this, a new weno difference scheme which based on dispersion - relation - preserving relation is developed, and representative test cases with this scheme for computational aeroacoustics ( caa ) problems has been implemented and compared in order to test capability of wave capturing ; in addition, weno schemes generally do not converge at high order in the presence of contact discontinuity of euler equations, so a conservative front tracking technique coupling weno schemes and level set method to simulate the translating density profile is presented here, and numerical simulation with this technique for representative test case has been implemented and results show the desired accuracy
本文研究了高階精度加權基本無振蕩（ weno ）格式及其在雙曲守恆律方程中的應用，在此基礎上作了兩個方面的工作：一是針對高頻聲波問題構造出一種基於保色散關系（ drp ）的weno有限差分格式，並對計算氣動聲學（ caa ）問題的代表性算例進行了大量數值實驗，比較了該格式捕捉波數的能力；另外，針對高階weno格式在處理euler方程的接觸間斷時精度有所降低的問題，研究了利用界面追蹤技術levelset方法和高階激波捕捉weno格式相結合的一種守恆追蹤方法，並且給出有代表性的密度滑移面問題的算例，得到一致高階精度的數值模擬結果。 -
Field observations and physical models may be used to investigate pollutant transportation and dispersion within urban canyons and validate numerical models. on the other hand, validated numerical models are often applied to simulate in detail atmospheric dispersion within the urban canopy. the numerical results in combination with physical model and or field data may be used to assess urban air quality and support decisionmaking for pollution control strategies and traffic planning
外場觀測和物理模擬可以考察街谷內污染物的傳輸擴散規律並對數值模式進行檢驗，另外，復雜的數值模式則可對城市冠層內大氣擴散問題進行詳細模擬，數值模擬和外場觀測及物理模擬相配合，可用於環境質量評價污染控制決策及交通規劃。 -
Field observations and physical models may be used to investigate pollutant transportation and dispersion within urban canyons and validate numerical models. on the other hand, validated numerical models are often applied to simulate in detail atmospheric dispersion within the urban canopy. the numerical results in combination with physical model and or field data may be used to assess urban air quality and support decision ? ? making for pollution control strategies and traffic planning
外場觀測和物理模擬可以考察街谷內污染物的傳輸擴散規律並對數值模式進行檢驗，另外，復雜的數值模式則可對城市冠層內大氣擴散問題進行詳細模擬，數值模擬和外場觀測及物理模擬相配合，可用於環境質量評價污染控制決策及交通規劃。 -
Propagation of spectra affected by third - order dispersion in dispersion - decreasing fiber near zero dispersion wavelengths was studied by means of numerical simulation
摘要為探討三階色散對脈沖傳播的意義，用數值模擬的方法討論了在色散緩變光纖中零色散波長附近三階色散對脈沖頻譜演變的影響。 -
Then the nonlinear coupled electromagnetic and electron motion equations were obtained from the lorentz equation. and numerical calculation and analysis of cold cavity by pic software were applied to analyze the both hot and cold dispersion characteristic of this waveguide
接下來，從電子運動方程出發得到了自洽非線性方程組，通過一階線性近似導出了螺紋波導中注波互作用色散關系，從中分析該波導超寬帶特性。 -
For the first time, the coaxial ridge - disk - loaded cylindrical waveguide as sws is presented. its dispersion equation and the expression of coupling impedance are given by application of the field matching method. a series of numerical results show that the influence of structure dimensions on the dispersion characteristics and interaction impendance
三、創造性地提出脊加載同軸膜片圓波導慢波結構，並對其採用嚴格的場匹配法，詳細推導了色散方程和耦合阻抗表達式，並得到一系列有關系統結構參量與色散和耦合阻抗之關系的數值模擬結果。 -
3. for the two - region model of one - dimensional solute transport through heterogeneous soils considering scale - dependent dispersion and immobile region under steady state flow, the numerical model is obtained by characteristic finite element method
對于穩態水流條件下，非均質土壤中考慮水動力彌散尺度效應以及不動水體存在時，一維溶質運移的兩區模型，建立了相應的特徵有限元數值模型。 -
The numerical simulations show that the phase plane and amplitude plane in orthotropic fluid - saturated porous media is not paralleled to each other any more though the dispersion caused by the fluid is omitted. it is one kind of non - homogeneous wave. the maximum attenuation is no longer
指出由於介質的各向異性，盡管忽略了流體粘度引起的粘度耗散，正交各向異性液飽和多孔介質中瑞利波的相平面和幅平面亦不再重合，為非均勻波，最大的衰減不再沿波傳播方向。 -
In order to proof the program ' s effectiveness, we made some experiments on ly - 12a1 by shpb. in addition, based on the pochhammer - chree ' s theoretical solution about the stress wave propagation in infinite cylindrical bar, a numerical approach for analyzing dispersion in shpb experiments is developed
由於應力波在桿中傳播時存在彌散效應，在hopkinson桿實驗中，採用桿中某處的應變來代替桿與試件接觸端面處的應變，這必然會因為應力波的彌散效應給實驗結果帶來偏差。 -
First, we reviewed the finite - difference time - domain yee ' s method. the difference equations, the stability condition, numerical dispersion characteristics, absorbing boundary conditions, incident wave source conditions and the calculation of the frequency - dependent scattering parameters are discussed
首先本文回顧了時域有限差分yee演算法，包括時域有限差分的差分方程、穩定性條件、數值色散特性、吸收邊界條件，激勵源的設置以及散射參數的計算等。 -
With the increasing of electronic element integration, the problem of heat dispersion has become one of restrict factor in the development of electron technology. to meet the demond of rapidly increased thermal dispersion, numerical simulation and experimental study on heat pipe radiator for electronic element has been made in the paper
由於電子器件散熱技術研究的日益重要，本文首先對電子器件散熱技術及熱管型電子器件散熱器的國內外研究和發展現狀進行了綜述，並在此基礎上對熱管型電子器件散熱器進行了數值模擬和實驗研究。 -
The dispersion characteristics and interaction impedance of the groove guide sws are analyzed theoretically in detail. by use of matlab, numerical programs are compiled to get dispersion curves and impedance diagrams. the influence of geometrical dimensions on the dispersion characteristics and interaction impedance are discussed
三、對曲折槽波導慢波結構的色散特性和耦合阻抗進行了詳細的研究，色散方程的獲得是依照曲折波導慢波系統的分析方法，但耦合阻抗的計算公式是嚴格按照場論的方法得到的。 -
( 3 ) basing on the hydrodynamic model, a numerical model is established to simulate the transport and dispersion of pollutants in the coastal waters. the model is applied to simulate the cod distribution in hakata bay
（ 3 ）在水動力模型的基礎上，建立了污染物擴散輸移的數學模型，並將該模型應用於博多灣cod擴散輸移過程的數值模擬。 -
A numerical simulation on liquid - gas two phase leakage dispersion by using two particle turbulent models
兩種顆粒湍流擴散模型數值模擬氣液兩相流泄漏擴散的比較 -
The condition under which higher - order dispersive effects can be neglected is also discussed with numerical examples. 6. based on the fourier optics, the focusing of ultrashort pulses by a silica lens in both cases of constant beam waist and constant diffraction length is studied considering dispersion of first, second and higher order, respectively
6 ，使用傅立葉積分變換法，在考慮透鏡色差和高階色散效應的較為一般情況下，分別研究了等束寬超短脈沖高斯光束和等衍射長度超短脈沖高斯光束通過硅玻璃透鏡的聚焦特性。 -
Simulation research on numerical dispersion for modeling of wave guide devices by fdtd
法建模波導器件時數值色散的模擬研究 -
The suppression of numerical dispersion and improvement of absorbing boundary conditions in forward modeling of gpr
地質雷達正演中的頻散壓制和吸收邊界改進方法 -
In chapter one, we propose a new mixed method called characteristics mixed finite element method for a convection - dominated diffusion problems with small parameter e : we handle the convection part whth backward difference scheme along the characteristics, obtain much smaller time - trunction errors and avoid numerical dispersion on the front of the peak curve of the flow : we use a lowest order mixed finite element method to deal with the diffusion part, so this scheme can approximate the unknow function and its following vector with high accuracy at the same time
第一章中我們對小參數對流占優擴散問題提出了新的數值方法? ?特徵混合有限元方法，即對方程的對流部分採用沿特徵線的後退差分格式求解，以保證較小的截斷誤差限並避免了在流動的鋒線前沿數值彌散現象的出現；對流動的擴散部分採用最低次混合元方法求解，以保證格式對未知函數及伴隨向量的同時高精度逼近。由於該方法中檢驗函數可取分片常數，此格式在某種意義上具有局部守恆性質。 -
Important missing aspects are : turbulent flow, numerical discretization techniques specially the relevant and difficult topic of numerical treatment of advection and related numerical methods of solution, variable property fluids, boundary layers, stability, etc. rather, it focuses on more primitive and fundamental issues of numerical treatment of advective equation and proper formulation of initial boundary value ( ib vp ). numerical problems associated with advective dominated transport include spurious oscillation, numerical dispersion, peak clipping, and grid oriention. however, the key of numerical solution of three - dimensional advective problem is searching for a high - precision interpolating function, which can keep the computational stability and low damping
3 、針對三維純對流方程提出了實用的擬協調單元模式，並與線性插值模式和協調單元模式比較后表明，在物理量大梯度變化的情況下，線性插值模式會產生較大的數值阻尼，導致解的失真；協調單元模式具有極高的計算精度和良好的計算穩定性，還可較好地克服數值阻尼，但由於計及物理量的二階導數項，計算工作量大，邊界條件給定尚存在一定的困難；而擬協調單元模式不僅具有協調單元模式計算精度高的優點，還避免了物理量的二階導數項，可大大地減少計算工作量。
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