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- 저자 : 박준(J. Park) (검색결과 84 건)
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ASSESSMENT OF PROPERTY INTERPOLATION METHODS IN LEVEL SET METHOD
J.K. Park(박준권),J.M. Oh(오정민),K.H. Kang(강관형) 한국전산유체공학회 2009 한국전산유체공학회 학술대회논문집 Vol.2009 No.4
In level set method, material properties are made to change smoothly across an interface of two materials with different properties by introducing an interpolation or smoothing scheme. So far, the weighted arithmetic mean (WAM) method has been exclusively adopted in level set method, without complete assessment for its validity. We showed here that the weighted harmonic mean (WHM) method for rate constants of various rate processes, including viscosity, thermal conductivity, electrical conductivity, and permittivity, gives much more accurate results than the WAM method. The selection of interpolation scheme is particularly important in multi-phase electrohydrodynamic problems in which driving force for fluid flow is electrical force exerted on the phase interface. Our analysis also showed that WHM method for both electrical conductivity and permittivity gives not only more accurate, but also more physically realistic distribution of electrical force at the interface. Our arguments are confirmed by numerical simulations of drop deformation under DC electric field.
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비정상 압력구배를 겪는 난류경계층 유동박리 현상 URANS해석의 정확도에 대한 time-step 크기 효과 연구
박준신(J. Park),유동현(D. You) 한국전산유체공학회 2021 한국전산유체공학회지 Vol.26 No.1
Solutions of unsteady Reynolds-averaged Navier-Stokes (URANS) equations are obtained using Reynolds stresses which are directly computed from direct numerical simulation (DNS) solutions for the same flow configuration. By comparing the solution obtained using this method with the conventional URANS results and DNS results, it is able to identify the contribution of the time-step size and the turbulence model to the URANS solution. It is shown that, to accurately predict separation, the magnitude of Reynolds stresses predicted from URANS technique is more important than its temporal variation. It is also shown that the solution starts to deviate from the DNS result even with the time-step size much less than the period of the organized unsteadiness.
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탄소와 질소 함량에 따른 탄질소 복합첨가강의 내마열 특성 변화
박준기(J. K. Park),이슬기(S. K. Yi),김성준(S.-J. Kim),김용석(Y.-S. Kim) 한국소성가공학회 2009 한국소성가공학회 학술대회 논문집 Vol.2009 No.5
Dry-sliding-wear behavior of Fe-18Cr-10Mn steel with various carbon and nitrogen contents was characterized, and the effect of carbon and nitrogen contents on the wear was investigated. Dry sliding wear tests of the steel were carried out at room temperature against an AISI 52100 bearing steel ball using a pin-on-disk wear tester. Applied wear loads were varied from 10 N to 100 N, and the sliding distance was fixed as 720 m. Worn surfaces and the wear debris of the steel were examined using an SEM to find out the wear mechanism. It was found that the Fe-18Cr-10Mn with both carbon and nitrogen exhibited superior wear resistance to the steel with only nitrogen. The wear resistance of the Fe-18Cr-10,m-xC-yN alloy was explained by the increased strain-hardening capability with the interstitial atoms.
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