Learning Forum

[maximilian.steiner.sp]

Hello,

I am working on creating a transient thermal model in Ansys Mechanical. My goal is to apply boundary conditions for convection, specifically a temperature and a heat transfer coefficient that both vary as a function of position. Furthermore, I would like to scale these functions over different time steps. While I’ve learned that it’s possible to scale values using an APDL script, it seems this doesn’t directly apply to functions. Is there a way to implement such position-dependent boundary conditions and also control their scaling over time via an APDL script? If so, how can I define and manage these temperature boundary conditions directly within the APDL script? I would also appreciate any alternative methods for scaling apart from using APDL.

Any advice or guidance would be greatly appreciated!

[peteroznewman]

Hello Maximilian,

One reason temperture and heat transfer coefficient vary as a function of position and time is due to the nature of the fluid flow conditions at the wall you have in your mechanical model.  Instead of a Transient Thermal mechanical model, use Fluent to build a transient thermal fluid flow simulation that includes the solid body that experiences the heat transfer.  By meshing the fluid outside the wall, the flow of fluid will cause heat to transfer at the wall as a function of position and time and the rate of transfer will depend on the velocity of fluid flow.