numerical dispersion造句
例句與造句
- Simulation research on numerical dispersion for modeling of wave guide devices by fdtd
法建模波導(dǎo)器件時數(shù)值色散的仿真研究 - The suppression of numerical dispersion and improvement of absorbing boundary conditions in forward modeling of gpr
地質(zhì)雷達正演中的頻散壓制和吸收邊界改進方法 - 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算法,包括時域有限差分的差分方程、穩(wěn)定性條件、數(shù)值色散特性、吸收邊界條件,激勵源的設(shè)置以及散射參數(shù)的計算等。 - 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(shù)對流占優(yōu)擴散問題提出了新的數(shù)值方法? ?特征混合有限元方法,即對方程的對流部分采用沿特征線的后退差分格式求解,以保證較小的截斷誤差限并避免了在流動的鋒線前沿數(shù)值彌散現(xiàn)象的出現(xiàn);對流動的擴散部分采用最低次混合元方法求解,以保證格式對未知函數(shù)及伴隨向量的同時高精度逼近。由于該方法中檢驗函數(shù)可取分片常數(shù),此格式在某種意義上具有局部守恒性質(zhì)。 - 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(xié)調(diào)單元模式,并與線性插值模式和協(xié)調(diào)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(chǎn)生較大的數(shù)值阻尼,導(dǎo)致解的失真;協(xié)調(diào)單元模式具有極高的計算精度和良好的計算穩(wěn)定性,還可較好地克服數(shù)值阻尼,但由于計及物理量的二階導(dǎo)數(shù)項,計算工作量大,邊界條件給定尚存在一定的困難;而擬協(xié)調(diào)單元模式不僅具有協(xié)調(diào)單元模式計算精度高的優(yōu)點,還避免了物理量的二階導(dǎo)數(shù)項,可大大地減少計算工作量。 - It's difficult to find numerical dispersion in a sentence. 用numerical dispersion造句挺難的