NND

Numerical Simulation of Three Dimensional Nozzle Flows by Using NND Difference Scheme

采用NND方法计算三维喷管气流场

Numerical algorithm is an implicit finite difference method related to the NND scheme .

差分算法是隐式NND格式。

The study of heat transfer rate around complicated configurations in hypersonic flows using NND finite-element method

高超声速复杂外形热流的NND有限元数值计算方法研究

NND Numerical Simulation Method for Capturing Muti-component Flow Interface

一种追踪多介质流体界面运动的NND数值模拟方法

Second order NND scheme was adopted . The pressure distributions of numerical results agree well with the experimental results .

数值模拟采用二阶NND格式求解二维NS方程，计算得到的壁面压强分布与实验结果吻合较好。

NND schemes were studied for initial vale problem of a scalar conservation law .

针对一维单个守恒律的初值问题研究了NND格式，在已有的数值方法的基础上，提出了一类隐式迎风格式，并证明了它是NND格式。

The Extentions of NND Schemes and Application to Viscous Flow Calculations

NND格式的推广及在粘流计算中的应用

Moreover , a factorization algorithm is introduced to implicit NND scheme to raise computational efficiency .

在隐式NND格式中引入了一种分解算法，提高了计算效率。

Calculation of axisymmetric plug nozzle flow field was completed with Zhang 's NND scheme .

采用NND差分格式，对塞式喷管轴对称流场进行了数值模拟。通过流场分析，可以对塞式喷管火箭发动机有清楚的认识。

The NND schemes in conservative variable type and shock capturing technology are used in the calculations .

计算中采用守恒变量型的NND差分格式和全流场捕捉技术；

Unsteady Taylor-Galerkin Finite Element Methods Considering NND Modification

考虑NND格式修正的非定常Taylor-Galerkin有限元法

Application of NND scheme on magneto hydrodynamics equations

NND格式在理想磁流体方程组中的应用

The Influence of Chemical Constitution nnd Condition of Formation on the Structure and Properties of Polyurethane Elastomeric Fibres

软段化学结构和成形条件对氨纶结构性能的影响

Studies on Physico chemical and Biological Properties of Antibiotic in vivo from Streptomyces NND 52

吸水链霉菌NND52胞内抗生素的理化性质及生物活性的研究

Non-oscillatory and Non-free parameter Dissipation ( NND ) difference scheme was used to calculate three dimensional nozzle flows .

本文运用NND显式差分格式，计算了三维喷管气流场。

In the70s , when NND last affiliation met a sword Pope that is

70年代的时候NND，上个门派遇到一个剑宗那是

The numerical experiments show that NND schemes can resolve robustly both boundary layer separation , attachment and complex shock waves interferences .

本文的数值计算表明，NND格式对复杂波系干扰、边界层分离与再附等流动现象均有较高的分辨率。

The numerical simulations of the flow field around and aerospike nozzle cell were completed base on N S equations with Second order NND scheme .

从NS方程出发，采用二阶精度的NND格式对塞式喷管的流场进行了数值模拟。

Application of Numerical Method based on Potential Theory to Cavity Contour The researches on the NND finite element method and its applications in predicting the heat transfer rate around complicated configurations

势流理论的一种数值方法在空泡形态中的应用复杂外形飞行器热流的NND有限元数值计算方法

The NND scheme based on Steger-Warming flux vector splitting is presented , and the flow field of shock wave tube is calculated by the finite difference method .

基于矢通量分裂得到了一维浅水方程组的隐式守恒有限差分格式，并对有底坡、有摩阻的梯级水库同时溃坝和相继溃坝的溃坝波传播进行了数值模拟。

The nonlinear relationships between the buckle propagation pressure and the length of the transition zone nnd the position parameter of the plastic hinge are derived using the energy principle .

过渡段长度以及塑性铰位置参数之间的非线性关系。

We generalize Non-oscillatory , Non-free parameter Discrete scheme ( NND ) for the first time and apply it to the conservative form of MHD equations .

首次推广了无振荡、无自由参数格式（NND），把它应用于守恒形式的MHD方程组。

The governing equations uncoupled with the source terms of species and energy were discretized numerically by finite volume NND scheme . The corresponding two dimensional programs were implemented .

将组分生成项和能量源项与流动控制方程组进行解耦计算，对控制方程组采用有限体积NND格式进行数值求解，编制完成了相应的二维计算程序。

The time splitting method is used to split the distribution function equations into the colliding relaxation equation and the convection movement equations . The NND finite difference method is adopted and extended to solve them .

采用时间分裂法，将简化速度分布函数松弛变化方程分解为源项碰撞变化方程、对流运动方程，进行耦合计算，应用NND耗散差分方法直接模拟气体分子速度分布函数；

The upwind NND scheme , which was proposed by Dr Shen Qing , is used in simulation . For eliminating the carbuncle phenomena , we select an appropriate entropy fit method .

差分格式采用沈清博士提出的迎风型NND格式，用熵修正方法消除了高超声速流数值模拟中的carbuncle现象。

A numerical method for solving three-dimensional Euler equations by using second-order accurate NND explicit finite difference scheme is presented to simulate the unsteady flows induced by rotor / stator interaction inside a compressor stage .

采用时空二阶精度NND显式差分格式求解三维Euler方程，对跨音速压气机级中动静叶排相干形成的非定常流动进行了数值分析。

The unsteady , compressible Euler equations are solved on dynamic unstructured grids by explicit , finite volume NND scheme , and , the fluid dynamics and rigid body dynamics equations are coupled .

该方法采用非结构动网格，显式NND有限体积格式，求解非定常Euler方程，并耦合了刚体动力学方程。

This report presents the time-depended fully implicit LU algorithm , which was used to solve the Navier-Stokes equations with NND difference scheme in numerical simulation to the flowfields of supersonic diffuser in the pressure recovery system .

采用数值模拟的手段，对压力恢复系统超声速扩散段三维流场进行研究。数值模拟使用LU分解法和NND差分格式求解全Navier-Stokes方程，并加入了湍流模型。

The numerical simulation was based on an Non-Oscillatory and Non-Free Parameters Dissipation Difference ( NND ) scheme to solve the three-dimensional Navier-Stokes equations , and the cold flow experimental studies using air were performed to evaluate the nozzle performances .

数值模拟采用无波动、无自由函数耗散（NND）差分格式求解三维NS方程，利用空气冷流实验方法评价了喷管性能。

A four-stage modified Runge-kutta scheme was applied to solve the ideal three-dimensional magnetohydrodynamic ( MHD ) equations in generalized curvilinear coordinate system , and a characteristic type NND scheme was added in post-processing to overcome numerical oscillation .

采用修正的四步Runge-Kutta方法求解三维一般曲线坐标系下的理想磁流体方程组，为克服数值振荡，加特征型NND格式进行后处理。