无边界条件

文中在物面无滑移边界条件的基础上施加物面绕体轴的切向速度，通过求解定常NS方程对飞行器滚转进行模拟。

In the paper , the steady NS equation was solved to simulate aircraft roll by adding tangent velocity to no slip wall boundary condition .

非物理的出口区（PML缓冲区）方法结合Thompson无反射边界条件被用于边界条件的设置。

We use non-physical exit zones ( PML buffer zones ) together with Thompson 's Non-Reflecting Boundary Conditions to set the boundary schemes .

对于这种高Kn数渗流和传热，连续性假设不成立，不能使用传统的带无滑移边界条件的Navier-Stokes方程和Fourier定律来描述。

And classical Navier-Stokes equations and Fourier law with nonslip boundary condition is never suitable for this kind of gas flow and heat transfer with high Kn , because continuity assumption does not hold now .

在计算上，利用高阶紧致差分格式和高分辨率的无反射边界条件，求解全N-S方程，并将局部有限幅值扰动直接引入到钝体头部的曲面边界层中。

The full Navier-Stokes equations were numerically solved , using high-order compact finite difference schemes and high-resolution non-reflecting boundary conditions . The local finite amplitude disturbances were directly introduced into the boundary layer of a curved surface .

其中用高精度差分格式解流场控制方程组，很好的解决了精度的问题：采用无反射边界条件、特征入流边界条件、粘性边界条件及PML缓冲区边界等边界条件解决了边界问题。

We solve control equations with high precisions finite difference methods and get a solution of precision requirements ; We solve the boundaries with no-reflecting boundary conditions , characteristic inflow boundary conditions and perfect matched layer buffer zone , etc.

一种渐变无反射边界条件的建立与验证

Construction and validation of a gradually diminished flux nonreflecting boundary condition

使用非定常无反射边界条件模拟上游尾迹/叶片排干扰问题

Numerical simulation of interaction between upstream wakes and blade row using unsteady non-reflecting boundary conditions

首先通过模拟阵风在自由空间中的传播验证了无反射边界条件的可靠性；

The non-reflecting boundary conditions were firstly validated by simulating gust convection in the free space .

流体流动和表面的切向速度相等时即为常规流体力学中常采用的无滑移边界条件。

When their tangential speeds are equality , then it comes to the no-slip boundary condition as the conventional hydromechanics .

该元内假定应力场满足以柱坐标表示的平衡方程，及圆弧边的无外力边界条件；

The assumed stress field in the elements satisfies the equilibrium equations , the traction-free boundary conditions and the compatibility equations .

噪声传播采用完全欧拉方程作为控制方程，远场采用无反射边界条件。

By solving Euler equations and no-reflection boundary condition in the far field , the results of aeroacoustics field is obtained .

讨论了半空间中满足无渗透边界条件的一维黏性可压缩热传导流体的流动，给出了在小扰动和非等温条件下稀疏波的渐进稳定性。

The asymptotic stability of the rarefaction wave has been established for the impermeable wall problem under small perturbation conditions and non-isothermal conditions .

气动声学数值方法的关键是建立能保持色散关系的差分方程和正确处理无反射边界条件。

It is pointed out that the dispersion-relation-preserving finite difference schemes and appropriate nonreflecting boundary conditions are of critical importance to numerical methods for aeroacoustics .

本论文中，利用ANSYS/LS-DYNA软件中的无反射边界条件功能，用有限的计算区域来模拟实际的无限土壤模型。

In this paper , a finite computational region was used to simulate the infinite soil model , which was carried out by non-reflection boundary condition in ANSYS / LS-DYNA software .

数值算例同样显示，二阶滑移的影响在过渡流区不可忽略；而在无滑移边界条件下，气体可压缩性的影响随着最小膜厚与球体半径比值的增加而增大。

Numerical examples indicate that a significant effect of the second-order slip occurs in the transition regime . It is also shown that the compressible effect under no-slip condition increases with the ratio of minimum gap height to sphere radius .

长期以来流体动力学假设边界流体分子粘附在与之接触固壁上，采用无滑移边界条件计算牛顿流体与固体的摩擦阻力。

For a long time , fluid dynamics studies have relied upon the assumption that the liquid molecules are stationary relative to its adjacent solid , and no-slip boundary condition is used to calculate the drag force between Newtonian liquids and solid surface .

在边界滑移条件下，分析了平行平板微型槽在应用中由于微型槽中压力分布变化形成的气体阻尼问题，分析结果表明无滑移边界条件在微尺度流动分析中不再适用。

Based on slip boundary condition , gas damping caused by changes of pressure distribution along the microchannel was studied in the application of parallel plates microchannel . Computing results showed that traditional non-ship boundary condition was no longer applicable in micro flow analysis .

依赖时间问题的无反射人工边界条件

Nonreflecting Artificial Boundary Conditions for the Time-dependent Problems

同样，采用构造法在球面上获得了精确的无反射人工边界条件。

An exact artificial boundary condition is obtained on a spherical boundary by a constructive method .

采用运动网格的有限元法求解浅水波动方程。在船体周围的开边界上使用无反射的边界条件。

Finite element method with moving grids is used to solveshallow water equations based on a wave equation .

本文研究两类依赖时间问题的无反射人工边界条件及其数值方法。

In this paper , we investigate the nonreflecting artificial boundary condi-tions ( NRABCs ) and their numerical methods for the time-dependent problems .

既然中间速度场是对真实速度场的逐步逼近，因此，就无需人工边界条件，或者说人工边界条件即为物理边界条件。

Since the intermediate velocity in the iterative procedure can be regarded as a variable that gradually converges to the real velocity , no artificial boundary conditions are needed , i.e. the artificial boundary conditions are equal to the physical boundary conditions .

溶质在微极流体中的弥散&考虑无偶应力边界条件

Dispersion of Soluble Matter in Micropolar Fluids ── Using No-couple-Stress Boundary Condition

简述数值模拟方法的关键问题，包括：爆破加载模型、爆破荷载的计算、有限域的无反射边界以及阻尼条件的施加。

The key problems of numerical simulation method were briefly put forward such as blasting loading model , blasting load calculation , boundary and damping conditions .

其核心思想是通过坐标映射将单元沿某一方向延伸到无限远，然后通过无限远处的单元积分使得电位快速衰减为零，从而无需考虑截断边界条件。

The core concept of infinite element boundary condition is extending the element to infinity in a certain direction with coordinate mapping , then make the potential rapid decay to zero through element integral . Thus , truncation boundary condition is unnecessary to consider .

而无壁面函数边界条件时，要得到相同精度的结果，要求y+≈1。壁面函数的引入，为工程上准确预测飞行器在湍流流动中表面受力与气动热提供了保障。

On other hand , if don 't use wall function boundary condition , to obtain the same level accuracy result , need y ~ + ≈ 1.Using wall function boundary condition provide an accurate way to predicate force and heat transfer in engineering problems .

同时也研究了三维、非定常流体运动下游边界问题，提出了无反射出流边界条件，以减少在有限计算区域内人工出流边界反射引起的数值误差，保证直接数值模拟的精度和准确性。

Meanwhile , the downstream boundary problem for 3-D unsteady flow is studied , and a non-reflecting outflow boundary condition is put forward . The algorithm reduces the error induced by reflection from artificial outflow boundary in the limited computational region , and ensures the accuracy of direct numerical simulation .