Conjugate Heat Transfer Simulation For Unstructured Grids

The coupled calculation of the fluid flow and the solid heat transfer (conjugate heat transfer) is a promising approach in engineering. Specially to the thermal problem of turbine blade with internal cooling. So an interface software GMT (Gambit Mesh Transfer) has been built on the basis of Gambit commercial software, which can build a one to one mapping unstructured grids date structure by reading the date of msh file. A conjugate heat transfer code basing on the above date structure has been built on the hybrid unstructured meshes in this paper. The fluid flow is simulated by Reynolds-averaged Navier-Stokes equations and the turbulence model is Spalart-Allmaras model. The solid heat transfer is simulated by heat conduction equation. At every iteration, the couple approach is achieved by maintaining a continuous local heat flux and a common temperature at the points along the fluid-solid interface. The key of the couple approach is the calculation of interface temperature which maintains the equality of the local heat flux passing the interface. On the fluid-solid interface, a point to point mesh relationship in the purpose of avoiding interpolation has been built in order to guarantee information delivery between the fluid domain and solid domain.To validate the code, Computational results have been compared with theoretical or experimental results for turbulent flat plate,transonic bump,laminar couple flat plate and Mark-â…¡turbine guide blade. All results showed well compared with theoretical or experimental results. All these results verified the conjugate capability of the code.