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NUMERICAL INVESTIGATION ON STATIC STIFFNESS CHARACTERISTICS OF POROUS AIR BEARING CONSIDERING ROUGHNESS EFFECTS  

Gwon, H.R. (중앙대학교 대학원 기계공학과)
Lee, S.H. (중앙대학교 기계공학부)
Lee, J.E. (중앙대학교 기계공학부)
Publication Information
Journal of computational fluids engineering / v.13, no.2, 2008 , pp. 62-67 More about this Journal
Abstract
This study aims to investigate numerically the static stiffness characteristics of porous air bearing and to estimate appropriate permeability values of porous medium. In particular, a new roughness model is proposed and implemented into the commercial CFD code (FLUENT Ver. 6.2) by using C language based user subroutine. The predicted results are extensively compared with experimental data. The roughness model is also validated through comparison with the results from open literature. It is found that the predictions for static stiffness are in good agreement with experimental data. Therefore, the suggested model based on the roughness Reynolds number can be used in studying the stiffness characteristics of porous air bearing effectively. In addition, numerical simulations of various diameter size and conditions are conducted. According the results, it is expected that the static stiffness of porous air bearing has the non-linear characteristics.
Keywords
Porous Air Bearing; Stiffness; Permeability; Roughness Effect; User Defined Function;
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