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http://dx.doi.org/10.9709/JKSS.2012.21.1.035

A Study on the Analysis of Underwater Behaviors of Two Bodies Having Different Weight Characteristics  

Ahn, Jin-Hyeong (국방과학연구소)
Jung, Chan-Hee (국방과학연구소)
Publication Information
Journal of the Korea Society for Simulation / v.21, no.1, 2012 , pp. 35-43 More about this Journal
Abstract
In this study, underwater behaviors of negative buoyant body and positive buoyant body, which are ejected from a platform, are compared through eject test and simulation. CFD(Computational Fluid Dynamics) method is used to calculate the hydrodynamic derivatives of negative buoyant body with varied hull. Hydrodynamic derivatives that cannot be calculated with CFD are used with the same values of base shape. The pitch angles of test data are much bigger than those of simulated data, and the reason is supposed to be the trailing air effect. A more accurate simulation is possible via modified force modeling which reflects this phenomenon. The underwater behaviors of positive buoyant body and negative buoyant body are somewhat different with each other at the same eject condition, but it may not be a problem in the view of operation.
Keywords
Underwater Behavior; Positive Buoyant Body; Negative Buoyant Body; Trailing Air Effect;
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