There are three main research methods in natural ventilation: simple theory analyse method, experimental method and numerical simulation method.
目前自然通风主要有三种研究方法：简单的理论分析法、实验法和数值模拟法。
Mathematical model and numerical methods of stress field simulation during foundry process are studied, future research emphasises are pointed out.
分析了应力场数值模拟采用的数理模型和数值方法，指出了存在的问题，明确了今后的研究重点。
It is of great significance to the research of columnar-to-equiaxed transition (CET), and numerical simulation is one of the valid methods.
柱状晶向等轴晶转变(CET)的研究具有重要意义，数值模拟是其有效的研究方法之一。
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