난류 자기유체역학 유동 예측을 위한 난류모형의 평가와 개선
Evaluation and improvement of turbulence model for prediction of turbulent magnetohydrodynamic flows
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초록
The characteristics of the turbulent MHD channel flows are analysed within the elliptic blending model. The evaluation of additional terms representing the MDH interactions in the transport equation for the turbulent kinetic energy and dissipation rate is carried out firstly. And then, the improvement of model coefficients for the additional terms is achieved. Regardless of the magnetic field orientation, perpendicular and parrel to the mail flow, the model coefficients for the additional terms are not changed to maintain the generality of the present model. The prediction results are directly compared to the DNS data to assess the performance of the present model.
Abstract
The characteristics of the turbulent MHD channel flows are analysed within the elliptic blending model. The evaluation of additional terms representing the MDH interactions in the transport equation for the turbulent kinetic energy and dissipation rate is carried out firstly. And then, the improvement of model coefficients for the additional terms is achieved. Regardless of the magnetic field orientation, perpendicular and parrel to the mail flow, the model coefficients for the additional terms are not changed to maintain the generality of the present model. The prediction results are directly compared to the DNS data to assess the performance of the present model.
참고문헌 (7)
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- S. Smolentsev, "Application of the ‘K─∈’Model to Open Channel Flows in a Magnetic Field", Int. J. Engineering Science, 40, pp.693~711 (2002)
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- H. Noguchi, "DNS Database of Turbulence and Heat Transfer", ~ (1998)
- 신종근, "타원혼합 방정식을 사용하는 k-∈-v2 난류모형", 한국기계기술학회지, 15(3), pp.401~406 (2013), 한국기계기술학회
- 신종근, "타원혼합모형에 의한 폴리머 항력감소 난류유동의 예측", 한국기계기술학회지, 15(5), pp.653~660 (2013), 한국기계기술학회