Solution Strategies for Periodic Heat Transfer

zzu340

最近在做传热计算的时候用到周期性边界条件，但计算的结果不是很理想，仔细查阅帮助文档发现了下面的资料，希望有经验的朋友讨论一起讨论一下周期性边界条件的应用
After completing the inputs described in Using Periodic Heat Transfer, you can solve the flow and heat transfer problem to convergence. The most efficient approach to the solution, however, is a sequential one in which the periodic flow is first solved without heat transfer and then the heat transfer is solved leaving the flow field unaltered. This sequential approach is accomplished as follows:
Disable solution of the energy equation in the Equations dialog box, accessed via the Solution Controls task page.
  Solution Controls  Equations...
Solve the remaining equations (continuity, momentum, and, optionally, turbulence parameters) to convergence to obtain the periodic flow field.

Important:
When you initialize the flow field before beginning the calculation, use the mean value between the inlet bulk temperature and the wall temperature for the initialization of the temperature field.
Return to the Solution Controls task page and turn off solution of the flow equations and turn on the energy solution.
Solve the energy equation to convergence to obtain the periodic temperature field of interest.
While you can solve your periodic flow and heat transfer problems by considering both the flow and heat transfer simultaneously, you will find that the procedure outlined above is more efficient.

almostfamous

cfx应该是可以设置先solive without heat transfer，还是一起算的。fluent 应该也可以设置吧

zzu340

恩，Fluent也可以这样设置。最近在算湍流用周期性边界算的摩擦因子差不多，但传热误差挺大的。不知其中有什么原因。

水若无痕

zzu340 发表于 2011-10-28 11:21
恩，Fluent也可以这样设置。最近在算湍流用周期性边界算的摩擦因子差不多，但传热误差挺大的。不知其中有 ...

对流换热？必须有边界层。

zzu340

不一定，我觉得划分边界层得主要原因是便于控制近壁面网格，个人理解，还请指正

zzu340

不一定，我觉得划分边界层得主要原因是便于控制近壁面网格，个人理解，还请指正