Abstract
This paper investigates the requirements for turbulence models, in application to heat transfer simulation of turbine part, from a thermal stresses point-of-view. The investigation was based on thermal-fluid-structure interaction (thermal-FSI) analysis of the convectively-cooled turbine vane C3X, for which experimental heat transfer data is available and a laminar-turbulent transition occurs in the boundary layer. First, the production of turbulence energy at the stagnation point was investigated based on multiple turbulence models able to capture the transition phenomena. Next, the influence of turbulence modelling on thermal stresses was addressed. The stresses produced by experimental temperature field were compared with the modelled temperature-induced stresses. The presented results show that even relatively small discrepancies in temperature in an area where gradients of temperature are high can lead to large discrepancies in thermal stresses.
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