基于BDF自动生成算法的温度场计算优化方法

Optimization Method of Temperature Field Calculation Based on Automatic BDF Generation Algorithm

船体温度场是液化天然气(LNG)运输船设计的核心内容。针对温度场迭代计算过程中因数据量大、迭代次数多导致的计算时间过长、MSC.Patran异常退出等问题,提出一种高效的温度场迭代计算优化方法。利用Patran命令语言获取载荷数据生成外部文件,采用C++标准模板库编程实现BDF自动生成算法以减少迭代计算时间。对220 000 m^3棱柱型LNG运输船进行船体温度场计算实验,结果表明,该方法在保证计算结果正确的同时,大幅提高了迭代计算效率。

The hull temperature field is the core issue in the design of Liquefied Natural Gas（LNG） carrier. In the iteration process ,large amount of data and large number of iterations lead to long computation time ,unexpected MSC. Patran quit. In view of these, an efficient iterative calculation optimization method of temperature field is proposed. This method uses Patran Command Language（PCL） of MSC. Patran to obtain the load data and generate external files, and realizes the Bulk Data File（BDF） automatic generation algorithm by using the C ＋ ＋ Standard Template Library （STL） programming to reduce iterative calculation time. The temperature filed calculation experiment is carried out on a prismatic LNG carrier with the capacity of 220 000 m3. Results show that the new method ensures correctness and improves the efficiency of iterative calculation.