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Numerical analysis of the subsonic flow around a three-dimensional cavity

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Abstract

Flight vehicles such as wheel wells and bomb bays have many cavities. The flow around a cavity is characterized as an unsteady flow because of the formation and dissipation of vortices brought about by the interaction between the free stream shear layer and the internal flow of the cavity. The resonance phenomena can damage the structures around the cavity and negatively affect the aerodynamic performance and stability of the vehicle. In this study, a numerical analysis was performed for the cavity flows using the unsteady compressible three-dimensional Reynolds-Averaged Navier-Stokes (RANS) equation with Wilcox’s turbulence model. The Message Passing Interface (MPI) parallelized code was used for the calculations by PC-cluster. The cavity has aspect ratios (L/D) of 2.5 ∼ 7.5 with width ratios (W/D) of 2 ∼ 4. The Mach and Reynolds numbers are 0.4 ∼ 0.6 and 1.6×10 6, respectively. The occurrence of oscillation is observed in the “shear layer and transient mode” with a feedback mechanism. Based on the Sound Pressure Level (SPL) analysis of the pressure variation at the cavity trailing edge, the dominant frequencies are analyzed and compared with the results of Rossiter’s formula. The dominant frequencies are very similar to the result of Rossiter’s formula and other experimental data in the low aspect ratio cavity (L/D = ∼ 4.5). In the large aspect ratio cavity, however, there are other low dominant frequencies due to the leading edge shear layer with the dominant frequencies of the feedback mechanism. The characteristics of the acoustic wave propagation are analyzed using the Correlation of Pressure Distribution (CPD).

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Authors and Affiliations

  1. Korea Electric Power Research Institute 103-14, Munji-Dong, Yusong-Ku, Taejeon, 305-380, Korea

    Hong-il Choi

  2. Department of Aerospace Engineering, Chosun University, 375 Seosuk-dong, Dong-gu, Gwangju, 501-759, Korea

    Pa-ul Mun & Jae-soo Kim

Authors
  1. Hong-il Choi
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  2. Pa-ul Mun
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  3. Jae-soo Kim
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Corresponding author

Correspondence to Jae-soo Kim.

Additional information

This paper was recommended for publication in revised form by Associate Editor Do Hyung Lee

Hong-il CHOI received the B.S and M.S degrees in Aerospace Engineering from Chosun University, Korea in 2005 and 2008, respectively. He currently work at KOREA Electric Power Research Institute in Korea

Pa-ul MUN received the B.S in Aerospace Engineering from Chosun University, Korea in 2008. He is currently Candidate for the degree of master of Aerospace Engineering at Chosun University in Korea.

Jae-soo KIM received the B.S in Aerospace Engineering from Seoul National University in Korea in 1981. He then received his M.S and Ph.D. degree in Aerospace Engineering from KAIST in Korea in 1983 and 1987, respectively. He spent one year at Cornell university(USA) as a Post Doc. He worked at Korea Aerospace Research Institute for eight years. Dr. Kim is currently a Professor at the Department of Aerospace Engineering at Chosun University in Korea

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Choi, Hi., Mun, Pu. & Kim, Js. Numerical analysis of the subsonic flow around a three-dimensional cavity. J Mech Sci Technol 23, 1702–1709 (2009). https://doi.org/10.1007/s12206-009-0413-5

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  • DOI: https://doi.org/10.1007/s12206-009-0413-5

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