I'm trying to simulate a conjugate heat transfer between a rotating solid disc and its surrounding air in Fluent. The disc temperature must decrease gradually by transferring the heat to the air. I used the Patch option to set an initial temperature for the disc. My problem is that the disc transfers heat to surrounding but not getting cooler and its temperature remains constant.
Here is more about the setup:
- I have one solid domain and two fluid domains. the solid domain (1) and its adjacent fluid domain (2) are rotating together using Sliding Mesh method.
- The solid domain (1) and its adjacent fluid domain (2) have a conformal interface. (I guess it should be like this to have conjugate heat transfer).
- Between the fluid domains (2 & 3) I have a non-conformal interface. (I did it to use Sliding Mesh method)
Solver: Pressure-Based, Transient
Models: Energy + Realizable k-e viscous
Cell Zone Conditions: I set Mesh Motion with 500rpm rotational velocity for domains 1 & 2
Boundary Conditions: I have a pressure inlet & a pressure outlet. I set rotational motion with relative velocity to all the walls adjacent to rotating cell zones. Thermal settings are set to the default: coupled for solid-fluid interface and 0 heat flux for fluid-fluid interface
Solution Initialization: Hybrid initialization with 200C patch for the disc
Time Step Size: 0.012s
Here is the geometry
and here is the contour of temperature after some time steps: