step by step method meaning in English

按步法
按步方法
步进法
逐步法

" direct method " can give accordingly exact results , but is very time consuming ; " step by step method " needs little cpu time and can give high quality results to first part which is quite simple and easy to resolve , but fail to predict the air motion of whole room space
计算结果表明，直接模拟法相对来说最准确，但是耗费资源，局部计算能清楚显示某一区域内的流场特性，但是由于界面上的简化，引致对整个空间流场的计算误差较大。
Second , " step by step method ' : first solve part of the case , the results of the first part is been written as user difined founctions , then read these fouctions into the remain part of the case , solve the case . the last way is " porous media method " : treat highly complex region with porous media , mesh the whole space enclosure and solve the case using fluent
本文中采取了三种不同的方法对西安四联智能股份有限公司的会议室模型进行数值计算预测流场：一是直接划分网格进行计算；二、抽取局部进行计算，这是面对复杂问题比较常用的一种方法；三、采用类似换热器模型的思路，利用多孔介质模型简化复杂流场，再划分网格进行计算。