Coupled flow and heat transfer analysis using hybrid structured-unstructured grids

A procedure is presented for the simultaneous solution of the Navier-Stokes equations in flow passages and the heat conduction equation in passage walls (i.e. the conjugate heat transfer problem). The temperature fields within the flow and wall are coupled on each time step so that they evolve together in a timeaccurate manner. Hybrid structured/unstructured grids are used to simplify the generation of grids in complex geometries, like the cooling passages of turbine blades. Two procedures were investigated for coupling the Navier-Stokes and heat conduction modules. The first, which transfers heat flux from the Navier-Stokes module and wall temperature from the heat conduction module to the Navier-Stokes module, was unstable. It led to wild oscillations in temperature at the wall. The second coupling procedure eliminates these oscillations by transferring a heat conduction coefficient and reference temperature from the Navier-Stokes module to the heat conduction module. Preliminary results are presented, validating the coupled procedure for simple flows and demonstrating the flexibility of hybrid structured/unstructured grid for complex geometries.

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