Abstract : this paper discusses the different differential methods of alternating direction implicit method with initial condition and boundary conditions in detail 文摘:详细地研究了各种情形的求解二维抛物型方程初边值问题的交替方向隐式差分法。
As 2 - d 3 - t heat conduct equations are discretized in a fully implicit method , it is very difficult to solve the nonlinear algebraic equations obtained due to strong nonlinearity 摘要由于二维三温热传导方程具有很强的非线性特性,因此采用全隐格式对该方程离散后,所得非线性代数方程组的求解将变得非常困难。
In order to finishing these projects successfully , the character of flow field of the yangtze estuary must be understood fully , two dimension program with double sweep implicit methods are compiled to calculate the flow character of the yangtze estuary firstly 从事该研究工作的出发点是长江口整治工程正在如火如荼的开展,为了确保这些工程的顺利完成,必须弄清长江口的水动力特性。
No . 2 , a fast simulation technique is proposed to approximate the filtering effects of the implicit method in order to alleviate the heavy computation brought by the implicit integration method . no . 3 , an algorithm to dynamically regulate the time step is detailed 柔体仿真过程中一直存在的瓶颈问题首先是为保证仿真过程的稳定性而不得不采用较小的时间步长,其次是求解微分方程时耗费的计算量过大。
Stsggered grid system is used in derivation of discretized equations and alternating direction implicit method is appilied in equations ' s caculation in the paper . in order to ensure stability and accuracy of numerical calculation , i adopt semi - implicit method for pressure - linked equations that is very popular so far 本文在对方程离散时采用了交错网格技术,在对离散方程求解时则采用了交替方向叠代技术( adi法) 。为保证数值计算的稳定性和精确性,采用了目前较为流行的simple类计算程序。
Due to the diversities of browsing behaviors among different users , this thesis designs an algorithm to construct and maintain the relationship of user ’ s behaviors and interests . this algorithm can consider user ’ s own characteristics and gain user ’ s interesting webpages by combining implicit methods and explicit methods 考虑到用户行为的个体差异性,本文设计了一个用户浏览行为与兴趣度关系建立与更新的算法,该算法可以针对每一个用户的特点,综合利用用户的隐式反馈和显式反馈获取用户感兴趣的网页。
A better desired ventilation form is acquired by comparing the three efficiency values . on the basis of recently materials collected in the field at home and abroad , this paper adopts two - equation turbulence model by analysis and comparison , and sets up mathematical model to study three - dimentional indoor turbulent flow . control - volume method and power - law scheme is used to discrete these differential equations . according to semi - implicit method for pressure - linked equations ( simple algorithm ) , author writes a general program in c language for simulation of the velocity profile , temperature and pollution concentration distributions of indoor airflow , and the writing , the debugging and the running of the program . all are completed in microsoft visual c + + 6 . 0 environment 在收集国内外在这一领域内的大量资料的基础上,通过分析与比较,采用了k -双方程模型来研究室内气流的浓度分布,建立了描写稳态的三维紊流室内气流浓度分布的数学模型,采用控制容积法和幂函数分布方案来离散微分方程组,按压力藕合方程的半隐式法( simple )算法,用c语言编写了计算室内气流流场和温度场、浓度场的通用程序,并在microsoftvisualc + + 6 . 0环境下对程序进行编制、调试与运行,并对调试工作做了探讨与分析。
Recently , changes have taken place in the field of english teaching , especially on the methods of teaching grammar in the china ' s middle schools : implicit methods of learning grammar rules are replacing explicit methods , class activities are beginning to focus on developing students " communication skills rather than grammar rules 近几年来,我国外语教学领域发生了很大变化,尤其是中学外语教学对语法教学进行了重大改革:一改过去用直接法讲解理论知识,而采用含蓄法培养学生的交际能力,让他们在实际应用中掌握英语语法规律。
Based on the fundamental theory of dynamics of soil moisture and the condition of water storage pit irrigation , numerical modeling of soil moisture movement of single water storage pit in heterogeneous soil is established . adi ( alternating direction implicit method ) and gauess - seidel iterative method are used to solve it . by using the simulated value of modeling , the relation of water injection volume and maximum horizental distance of moisture frontal are concluded . according to the relation , interval of pits are derived . then , after analyzing the infiltration characteristic of soil moisture under the condition of interference infiltration in multi storage pit , numerical modeling of soil moisture movement of multi water storage pit in heterogeneous soil is established , and its numerical solution is also acquired 利用adi (交替方向隐式差分法)结合gauess ? seidel迭代法对模型进行数值求解。利用模型的计算结果得出了单坑注水量与湿润锋最大水平推进距离之间的关系,并据此确定了坑距。在此基础上,通过对多坑干扰入渗条件下土壤水分入渗特性进行分析,太原理工大学硕士研究生学位论文建立了蓄水多坑非均质土壤水分运动数学模型,并对其进行数值求解。
In the models , the time dependent parabolic equations , deduced from the mild slope equations with currents or not , are used as the governing equations . based on the general conditions for open and fixed natural boundaries with an arbitrary reflection coefficient and phase shift , the boundary conditions for the present models are treated . the alternative direction implicit method is used to solve the governing equations and the numerical schemes are unconditional stable 在建立模型时,将原始的椭圆型缓坡方程的近似型式? ?依赖时间变化的抛物型方程,作为控制方程;从将开边界条件、不同反射特性的固壁边界条件相统一的表达式出发,对边界条件进行处理;用adi法数值求解控制方程,格式无条件稳定;节省了计算机内存和计算量。