한국항공우주학회지 (Journal of the Korean Society for Aeronautical & Space Sciences)

  • 제38권2호
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  • Pages.99-110
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  • 2010
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  • 1225-1348(pISSN)
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  • 2287-6871(eISSN)
한국항공우주학회 (The Korean Society for Aeronautical and Space Sciences)
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초음속 기저유동의 우수한 예측을 위한 DES 모델상수의 동적 보정

Dynamic Correction of DES Model Constant for the Advanced Prediction of Supersonic Base Flow

  • 신재렬 (부산대학교 항공우주공학과 대학원) ;
  • 최정열 (부산대학교 항공우주공학과)
  • 투고 : 2009.12.14
  • 심사 : 2010.01.25
  • 발행 : 2010.02.01
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초록

강한 압축성을 갖는 유동의 DES 해석에서, 일반적인 경험상수 $C_{DES}$ 값 0.65를 사용할 경우 경계층 내에서 인위적으로 LES 모드로 수행된다. 본 연구에서는 S-A DES 모델에서 RANS 모드 보호를 위하여 사용되는 난류 길이와 벽거리 비의 분포 함수를 이용한 $C_{DES}$의 동적 결정 방법을 제시하였다. 동적 $C_{DES}$ 결정식을 초음속 기저 유동장에 적용한 결과 다른 모델 상수를 사용한 기존의 연구 결과에 비하여 우수한 예측을 보여주었다.

The DES analysis of strong compressibility flow, LES mode is intentionally performed in boundary layer with the conventional empirical constant $C_{DES}$ value of 0.65. In this study, an expression is suggested to determine the $C_{DES}$ value dynamically by using a distribution function of the ratio of turbulence length scale and wall distance which is used in S-A DDES model for RANS mode protection. The application of the dynamic $C_{DES}$ presents better prediction than previous results those used constant but different $C_{DES}$ values.

키워드

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피인용 문헌

  1. Numerical Study on the Atomization Process of a Supersonic Gas-Metallic Liquid Atomizer vol.44, pp.7, 2016, https://doi.org/10.5139/JKSAS.2016.44.7.593