LNG 운반선의 자유수면을 포함한 자항상태 난류유동장의 수치해석
RANS Computation of Turbulent Free Surface Flow around a Self Propelled KLNG Carrier
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Abstract
The turbulent free surface flow around a self-propelled KRISO 138K LNG Carrier is numerically simulated using the finite volume based multi-block RANS code, WAVIS developed at KRISO. The realizable k-ε turbulence model with a wall function is employed for the turbulence closure. The free surface is captured with the Level-Set method and body forces are used to model the effects of a propeller without resolving the detail blade flow. In order to obtain an accurate free surface solution and stable convergence, the computations are executed with a proper fine grid refinement around the free surface and with an adoption of implicit discretization scheme for the Level-Set formulation. The computed velocity vectors at the several stations and wave patterns show a good agreement with the experimental results measured at the KRISO towing tank.
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