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남건우(Gun-woo Nam),윤웅섭(Woong-sup Yoon) 대한기계학회 2003 대한기계학회 춘추학술대회 Vol.2003 No.11
A study of argon droplet vaporization is conducted using molecular dynamics, instead of using<br/> traditional methods such as the Navier-Stokes equation. Molecular dynamics uses Lagrangian frame to<br/> describe molecular behavior in a system and uses only momentum and position data of all molecules<br/> in the system. So every property is not a hypothetical input but a statistical result calculated from the<br/> momentum and position data. This work performed a simulation of the complete vaporization of a<br/> three dimensional submicron argon droplet within quiescent environment. Lennard-Jones 12-6 potential<br/> function is used as a intermolecular potential function. The molecular configuration is examined while<br/> an initially non-spherical droplet is changed into the spherical shape and droplet evaporates. And the<br/> droplet radius versus time is calculated with temperature and pressure profile.
예조건화 압축성 알고리듬을 이용한 층류 분무연소장 해석
황용석(Yong-Sok Hwang),윤웅섭(Woong-Sup Yoon) 한국전산유체공학회 1998 한국전산유체공학회 학술대회논문집 Vol.1998 No.-
In this numerical experiment, the preconditioned compressible Navier-Stokes equation is tested to analyze the laminar spray combustion. Sprayed flow field is formulated by Eulerian-Lagrangian system for the gas and liquid phases each. DSF(Deterministic Separated Flow) model was adopted for the sprays with the vortex model to describe transients of individual droplet heating. Simplified single global reaction model approximates methanol-air reaction with and without disk flame holder. The equation system is discretized by finite difference technique and time integrated by LU-SGS. Due to greatly simplified chemical reaction mechanism and the lack of experimental evidences, most of the efforts were devoted to show the applicability and robustness of preconditioned compressible flow calculation algorithm. Computation results in qualitatively reasonable combusting flow field, hence it is believed that further refinement are required to produce quantitatively accurate solutions.