CIESC Journal

• 化工过程与装备 • 上一篇    下一篇

换热器流固传热边界数值模拟温度场的顺序耦合方法

郭崇志,肖 乐   

  1. 华南理工大学机械与汽车工程学院
  • 出版日期:2010-09-25 发布日期:2010-11-15

A sequence coupling method for numerical simulation of temperature

GUO Chongzhi,XIAO Le   

  1. School of Mechanical and Automotive Engineering,South China University of Technology
  • Online:2010-09-25 Published:2010-11-15

摘要:

通过建立由壳体、管板和换热管等组成的换热器有限元分析模型,使用FLUENT生成的CDB文件和ANSYS本身的物理场进行耦合,把外部CBD边界条件映射到ANSYS模型上。先利用“分段建模,整体综合”技术,从实现换热器的工艺热分析的角度考虑,由FLUENT软件得到换热器整体温度场,输出得到了包含固体表面节点、单元和温度载荷等信息的CDB文件,然后利用温度场顺序耦合的思想,利用由FLUENT得到的结构温度场边界,在ANSYS软件中取节点文件并求解,创建结构热分析所需的结构温度场。比对CFD结果和有限元结果可知,两者温度场的分布没有差别,此耦合过程中没有出现失真现象,这为研究换热器的温差应力分析提供了可靠的依据。

Abstract:

A finite element analysis model of a heat exchanger was builtwhich is composed of shellstubesplates etc. The external boundary temperature field was mapped to ANSYS by coulping the CDB file from FLUENT with ANSYS multifield model. The whole temperature field of the heat exchanger was firstly simulated in FLUENT using a technique of “simulation in subsectionsintegration of the whole”to obtain the processing thermal analysis of the heat exchanger. A CDB file from FLUENT including information such as solid surface’s nodeselements and thermal loads etc. was outputthen the sequence coupling was applied. After the nodal file was interpolatedthe CDB file was read and solved to obtain the solid surface temperature field in ANSYS model. It was proved by contrast that there is no difference in temperature field setted by the present method with that of CFD. Thereforein this coupling processthere was no precise loss between the datum from CFD and ANSYSthis feature provided a reliable basis for thermal-stress study of shell and tube heat exchanger.