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A Method for Conjugate Heat Transfer With Unsteady RANS Simulation

[+] Author Affiliations
Takashi Yamane

Japan Aerospace Exploration Agency, Chofu, Tokyo, Japan

Yuhi Tanaka

Tokyo University of Agriculture and Technology, Koganei, Tokyo, Japan

Paper No. GT2014-25582, pp. V05AT11A010; 9 pages
doi:10.1115/GT2014-25582
From:
  • ASME Turbo Expo 2014: Turbine Technical Conference and Exposition
  • Volume 5A: Heat Transfer
  • Düsseldorf, Germany, June 16–20, 2014
  • Conference Sponsors: International Gas Turbine Institute
  • ISBN: 978-0-7918-4571-4
  • Copyright © 2014 by ASME

abstract

The conjugate heat transfer simulation is expected to simulate precise temperature distributions of turbine cooling structures and contribute to the reduction of cooling air usage. This method has mainly been used to predict steady state temperature because of the large difference of time scale between RANS flow simulation and thermal conduction in solid materials, thus the accuracy of temperature estimation depends on the modeling of the turbulence. Despite many efforts to improve turbulence models, an inherent limitation of RANS and turbulence modeling and the necessity of unsteady simulation for better accuracy in heat transfer simulations have been pointed out. The aim of this study is to combine the unsteady RANS simulation with the steady thermal conduction of solid materials. The “Time Smoothing” method was introduced to compensate the large time scale difference between fluid and solid, then the effectiveness of the method was confirmed through conjugate heat transfer simulations around a pipe shape object where strong flow unsteadiness prevails.

Copyright © 2014 by ASME

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