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A Study on Applicability of Turbulence Models for Unsteady Turbulent Flow with Temperature Variation  

유근종 (창원대학교 기계설계공학과)
전원대 (창원대학교 기계설계공학과 대학원)
Publication Information
Journal of the Korean Society of Propulsion Engineers / v.6, no.1, 2002 , pp. 1-11 More about this Journal
Abstract
The suitable turbulence model is found to be required in the course of establishing a proper analysis methodology for thermal stripping phenomena which are shown in strong temperature variation area such as reactors and propulsion devices. Three different turbulence models of $\kappa$-$\varepsilon$ model, modified $\kappa$-$\varepsilon$ model, and full Reynolds stress(FRS) model, are applied to analyze unsteady turbulent flows with temperature variation. Three test cases are selected for verification. These are vertical jet flows with water and sodium, and parallel jet flow with sodium. Analysis yields the conclusion that 3-D computation with FRS betters others. However, modified modeling is required to improve its heat transfer characteristic analysis. Further analysis is performed to find momentum variation effects on temperature distribution. It is found that the momentum increase results increase of fluid mixing and magnitude of temperature variation.
Keywords
Thermal Stripping; Turbulence Model; Unsteady Flow; Jet Flows;
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