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무딘 물체에 안정화된 난류화염 LES의 Span방향 계산영역 크기의 영향
이현섭(H. Lee),이복직(B.J. Lee) 한국전산유체공학회 2018 한국전산유체공학회지 Vol.23 No.2
The bluff-body-stabilized premixed flames are often used in fundamental studies of turbulent flame characteristics. In this study, the numerical simulations were conducted for the Volvo bluff-body-stabilized premixed turbulent premixed flame, which recently has been used as a validation target of numerical methods in the turbulent flame community. For the present study, an OpenFOAM-based solver was used for large eddy simulation(LES) adopting the eddy dissipation concept(EDC) as a turbulent combustion model. The inflow conditions are set as a velocity of 17.6 m/s and a temperature of 288 K, at an equivalence ratio of 0.62 for the premixed propane and air. A no-slip isothermal wall boundary condition at 288 K was applied on the upper and lower walls and adiabatic no-slip wall boundary condition on the bluff-body flameholder. To assess the effect of the spanwise computational domain, the size in the z-direction for which a periodic boundary condition is applied was varied between 4H and 2H with an x-y domain of 25H x 3H where H is the flameholder height. The results for the two reduced sizes are reasonably consistent with the experimental results where the spanwise size was 6H, which implies that 2H periodic domain is sufficient to accommodate spanwise variation of turbulence.