數值彌散 的英文怎麼說
中文拼音 [shǔzhímísǎn]
數值彌散
英文
numerical dispersion- 數 : 數副詞(屢次) frequently; repeatedly
- 彌 : Ⅰ動詞1. (遍布; 充滿) overflow; fill 2. (填滿; 填補) fill Ⅱ形容詞(滿) full; whole Ⅲ副詞(更加) more Ⅳ名詞(姓氏) a surname
- 散 : 散動詞1. (由聚集而分離) break up; disperse 2. (散布) distribute; disseminate; give out 3. (排除) dispel; let out
- 數值 : numerical value; numerial number; figure; magnitude; value數值表 numerical tabular; 數值天氣預報 ...
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Thirdly, there is a preferential path for dispersion flow near the percolation threshold ; fourth, the longitudinal dispersivity is scaled with grid length
由於在逾滲閾值附近,網格可視為近似分形結構,對二維網格,縱向彌散系數和尺度之間存有指數增加關系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。As we all know that damage constitutional law of concrete is fit for solving mass little cracks situation, that fracture mechanics model is fit for solving only a few cracks situation, that separate crack model is only fit for dealing with those cracks whose locations is known firstly. but these situations do n ' t reflect the crack characteristic of the steel liner - reinforced concrete penstocks of the three gorges. so, this paper adopts the smear crack model to simulate crack
基於損傷力學模型更適合解決成群微裂縫問題,斷裂力學模型更適合解決少數裂縫情形,離散裂縫模式只能解決裂縫位置預先知曉的情形,這些都不符合三峽水電站鋼襯鋼筋混凝土引水壓力管道的裂縫特點,為此本文採用彌漫裂縫模式來進行裂縫的數值模擬,該裂縫模式能解決裂縫位置預先不知曉的情形,且能連續分析而無須重新劃分網格。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。The numerical simulation results show that the flow uniformity of catalytic converter with deflector is higher than that of the conventional catalytic converter
數值模擬的結果表明,有彌散器的催化轉化器的流動均勻性優于常規結構的催化轉化器。The calculation of the position of the shocks for the domain decomposition of the hyperbolic approximation is discussed. it is the matching stable problem for the different schemes in the different domains with different mesh size. after tracing the position of the shocks, the artificial compression method are applied to eliminate the smearing effect and to raise the resolution of the schemes. in the boundaries of each regions, the universal connected matching stable schemes are inserted in so as to make the schemes between different regions matching stable each other. at last, some numerical examples are presented
討論在激波計算中的區域分解法,即在不同區域中應用不同網格及格式的耦合穩定性問題.先定出激波位置,再在激波附近小范圍內,用低階格式及人工壓縮方法以消除彌散效應.在激波區域外,應用高精度格式,減少了過超振蕩現象,提高了解析度.在各區域交界應用全能穩定聯接格式,解決了格式的耦合穩定問題.最後舉出數值計算實例,計算結果與理論分析符合The characteristic approximation is used to handle the convection part along the direc - tion of fluid namely characteristic direction to ensure the high stability of the method in approximating the sharp fronts and reduce the numerical diffusion ; the mixed finite element spatial approximation is employed to deal with diffusion part and approximate the scalar unknown and the adjoint vector function optimally and simultaneously ; in order to preserve the integral conservation of the method, we introduce the modified characteristic method
該方法對方程的對流部分沿流體流動的方向即特徵方向離散以保證格式在流動的鋒線前沿逼近的高穩定性,消除數值彌散現象;對方程的擴散部分採用最低次混合有限元方法離散、同時以高精度逼近未知函數及未知函數的梯度;為保證方法的整體守恆性,在格式中引入修正項The new method is a combination of characteristic approximation to handle the convection part, to ensure the high stability of the method in approximating the sharp fronts and reduce the numerical diffusion, a smaller time truncation is gained at the same time, and a mixed finite element spatial approximation to deal with the diffusion part, the sealer unknown and the adjoint vector function are approximated optimally and simultaneously
此方法即為對方程的對流項沿流體流動的方向即特徵方向進行離散,從而保證格式在流動鋒線前沿逼近的高穩定性,消除了數值彌散現象,並得到了較小的時間截斷誤差;另一方面,對方程的擴散項採用混合元離散,可同時高精度逼近未知函數及其伴隨向量函數,理論分析表明,此方法是穩定的,具有最優的l ~ 2逼近精度。In the study, the performance of dual - bed three - way catalytic converters of conventional structure and with deflector are compared by numerical simulation and experiment
在研究過程中,採用數值模擬和試驗相結合的方法比較了常規結構和帶有彌散器結構雙載體三效催化轉化器的性能。The safety factor method is often adopted to evaluate the slope stability, but it does not take the randomicity and discreteness of geotechnical parameters into good consideration, which often results in the conservative result and unsafe declination. however, the method of reliability can remedy the defect effectively
在邊坡穩定分析中一般以安全系數法作為邊坡穩定性的評價方法,但由於其沒有很好地考慮巖土參數的隨機性和離散性,經常出現設計值過于保守和存在不安全的傾向,而可靠度方法可以有效地彌補這一缺陷。For scalar equation and system of equations, we build different ghost fields, translate one equation ( system ) into two equations ( system ). we still use high resolution shock capturing method to compute the two equations ( system ) ; level set equation is used to track the interface, and the result of original equation ( system ) is determined by the level set function. thus, we eliminate the numerical dissipation which high resolution shock capturing method cannot avoid near the interface, and the resolution is enhanced
對標量守恆律方程、守恆律方程組分別構造了一種虛擬區域,將一個方程(組)轉化成兩個方程(組) ,對這兩個方程(組) ,我們仍然使用高解析度激波捕捉格式,而levelset方程用來追蹤間斷的位置,原方程(組)的解最後由levelset函數決定:這樣做彌補了高解析度激波捕捉方法在間斷附近發生數值耗散的缺陷,提高間斷處的解析度。It was found that both number and sizes of the silicon particles are increased and the ratios of electric to thermal conductivity were decreased with the increase of the silicon content. the maximal seebeck coefficients occur when the si : fe mole ratio are between 2. 0 and 2. 1
發現隨著si含量的增加,彌散分佈的si顆粒增多,顆粒尺寸增大, 「電導率/熱導率」比值降低,但seebeck系數呈現先增加后減少的趨勢,在si : fe摩爾比為2 . 0 2 . 1時達到最大值。Especially in this condition when the peclet was large, dispersion and oscillation of numerical value was probed into. a simple approximate dioposal solution was put forward. then the solution of the model was validated by an exemple
( 2 )對地下水溶質運移數學模型的不同解法作一些探討,尤其對彼克來特數較大時的特殊情況,探討數值解的彌散與振蕩。For the advection - dispersion model of one - dimensional reaction solute transport through soils with depth - dependent first - order degradation and depth - dependent linear equilibrium sorption under steady state flow, the numerical model is established by characteristic finite element method
對于穩態水流條件下,同時考慮隨深度變化的一階降解和隨深度變化的線性平衡吸附時,一維反應溶質運移的對流-彌散模型,建立了相應的特徵有限元數值模型。分享友人