基于CFD和热阻网络法的C型舱LEG船温度场分析及热应力计算

Temperature field analysis of LEG carrier of tank type-C based on CFD/thermal resistor network method and thermal stress calculation

为解决C型舱LEG船进行温度场计算时,CFD方法难以计入结构细节以及热阻网络法处理热对流精度较低的问题,提出将2种方法相结合的船体结构温度场计算方法。在CFD计算时,只考虑主要结构,将计算结果作为热阻网络法的输入,而在热阻网络法中考虑结构细节。实船计算结果显示,该方法高效可靠,避免了2种方法的缺点,可以合理地求解船体结构的温度场,是一种工程上实用的方法。计算还表明,对于温度梯度大的关键结构区域,结构强度评估需要考虑热应力。

When performing temperature field calculation for LEG carrier of tank type-C, the CFD method cannot take the structural detail into account and the thermal resistor network method cannot consider the convective thermal exchange accurately enough. In order to solve the drawbacks, a new method is proposed by combining the two preceding methods to calculate the temperature field of hull structure. During the CFD analysis, only primary structure members are considered,and the results are utilized as inputs for thermal resistor network method analysis, where the structural details are considered.Calculation results indicate that the proposed method is effective and reliable, which can avoid the drawbacks of the two methods and suitable for temperature field calculation for hull structure. Thus, the proposed method is appropriate for engineering practice. Results also shows the thermal stress shall be considered for structure strength assessment for structure regions bear significant temperature gradient.