Researchers suggested many numerical methods convenient for the engineering , such as the rayleigh - ritz method , galerkin method , finite difference method , finite integral method , finite element method , etc 研究人员先后提出了便于工程应用的瑞利-里兹法、伽辽金法、有限差分法、有限积分法、有限单元法等数值计算方法。
Among all the methods , the finite - difference time - domain ( fdtd ) method attracts more and more attention because of its features , and some fdtd - based simulation software have also been developed 其中，时域有限差分（ fdtd ）法由于其独特的性能和优点得到了越来越广泛的应用和重视。而基于时域有限差分法的电磁仿真软件也得到了相应的发展。
Finite differential method ( fdm ) was applied to analyze the external flow field by fluent and calculate the drag coefficient , and the result of the external flow field by changing the shape of automobile model can be compared 采用有限差分法,运用fluent软件,分析某轿车模型附近的流场,计算出阻力系的数值,研究车身前部改进对汽车外流场的影响。
The numerical analysis modal base has been built , which encapsulates some analysis methods such as the linked - poled method , the finite difference method , the finite element method of different kinds foundations 该库封装了对柱下条形基础分析的链杆法、有限差分法、有限元法，筏板基础分析的有限差分法、有限元法以及桩筏基础非线性有限元分析等类对象。
The photonic crystal has important applications in optical communication , such as photonic crystal devices which is used to replace traditional electronic devices , the high speed of information communication is beyond imagination 首先通过传输矩阵法和时域有限差分法分别对一维光子晶体和平板光子晶体进行理论研究和数值模拟,为谐振腔的设计提供了理论依据。
The model is solved with the finite difference method , the simulation software is organized to simulate the transient thermal response of the front region of projectile wing such as those launched by electrothermal chemical guns 采用有限差分法进行数值求解，并编制了较为通用的仿真软件，用于模拟诸如由电热化学炮发射的高超声速穿甲弹弹翼前缘的瞬时热效应。
The - two - equation turbulence model and the control - volume integration method and simplest algorithm were employed to simulate the three dimensional , isothermal , incompressible , rectangular two - impinging - jet on a flat plate 本文采用-紊流模式，使用控制体积积分之有限差分法及simplest计算程序，进行三维、恒温、不可压缩、矩形双喷射撞击流场之数值模拟。
In the study on the performances of pml absorbing boundary conditions , the thesis improved , respectively , the 2d and 3d fdtd methods with pml absorbing boundary condition , and constructed the corresponding computer software 在时域有限差分法pml吸收边界条件研究中，本文完善了基于pml吸收边界条件的二维、三维的时域有限差分法，并开发了相应的fortran计算软件。
