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NUMERICAL ANALYSIS OF THREE－DIMENSIONAL SUBSONIC TURBULENT CAVITY FLOWS  

Choi, Hong-Il (조선대학교 항공우주공학과)
Kim, Jae-Soo (조선대학교 항공우주공학과)
Publication Information
Journal of computational fluids engineering / v.13, no.1, 2008 , pp. 35-40 More about this Journal
Abstract
Generally flight vehicles have many cavities such as wheel wells, bomb bays and windows on their external surfaces and the flow around these cavities makes separation, vortex, shock and expansion waves, reattachment and other complex flow phenomenon. The flow around the cavity makes abnormal and three-dimensional noise and vibration even thought the aspect ratio (L/D) is small. The cavity giving large effects to the flow might make large noise, cause structural damage or breakage, harm the aerodynamic performance and stability, or damage the sensitive devices. In this study, numerical analysis was performed for cavity flows by the unsteady compressible three dimensional Reynolds-Averaged Navier-Stokes (RANS) equations with Wilcox's $\kappa-\omega$ turbulence model. The MPI(Message Passing Interface) parallelized code was used for calculations by PC-cluster. The cavity has the aspect ratios of 2.5, 3.5 and 4.5 with the W/D ratio of 2 for three-dimensional cavities. The Sound Pressure Level (SPL) analysis was done with FFT to check the dominant frequency of the cavity flow. The dominant frequencies were analyzed and compared with the results of Rossiter's formula and Ahuja& Mendoza's experimental datum.
Keywords
Unsteady Subsonic Flow; Wilcox's; $\kappa-\omega$ Turbulence Model; Three Dimensional Cavity Flow; Sound Pressure Level Analysis; Message Passing Interface Parallelization;
Citations & Related Records
Times Cited By KSCI : 1  (Citation Analysis)
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