分别建立雷达电磁波在干涉区、中间区和绕射区传播的数学模型和它们适用的边界条件。
The mathematical models and their limitative condition of radar electromagnetic wave propagated in interference region, intermediate region and diffraction region are set up respectively.
地铁站台的气流流动属湍流流动，采用CFD对站台通风方式进行模拟时需要确定相关的边界条件和适用的湍流模型。
Airflow in underground railway station platforms is turbulent. Boundary conditions and proper turbulence model are required to determine when adopting CFD to simulate platform ventilation.
该模型可适用于不规则边界河道的数值模拟。
This model can be used to the numerical simulation of anomalistic river boundary.
结果表明，模型的计算值与实测值吻合较好，说明对荆江-洞庭湖区域复杂边界条件的处理是合适的，所建模型具有较好的适用性。
The result shows that the computed data and observed fits well, which indicates that it is suitable to sum the complex boundary of the Jingjiang-Dongting Lake and is applicable.
提出了一个三维钝裂纹的计算模型，并建立了适用于这类模型的边界元法程序。
A calculation model for 3-d blunt cracks in proposed and the corresponding boundary element method (BEM) computer program system is also established.
提出了一个三维钝裂纹的计算模型，并建立了适用于这类模型的边界元法程序。
A calculation model for 3-d blunt cracks in proposed and the corresponding boundary element method (BEM) computer program system is also established.
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