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Effects of Scale Ratio on Flow Characteristics in Moonpool
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 Title & Authors
Effects of Scale Ratio on Flow Characteristics in Moonpool
Lee, Sang Bong;
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When a geometric size of moonpool and an inflow velocity are determined based on the similarity of Froude number, Reynolds number is depending on the scale ratio of moonpool geometry. It means that different characteristics of flow fluctuations in moonpool can be observed depending on the scale ratio of moonpool even though Froude number is the same. In the present study two dimensional numerical simulations were performed to investigate the influence of scale ratios on the flow characteristics inside the moonpool. The inflow velocity at several scale ratios was determined to keep Froude number constant. A periodic response was observed in a small size of moonpool while a large moonpool showed complicated fluctuations with various amplitudes and frequencies, which made it difficult to distinguish the statistical steady-state response from the temporal responses in the case of large moonpool. The similarity of Froude number gave rise to a spectral characteristic which was inversely proportional to the square root of scale ratios () but a low frequent occurrence of strong vortex ($f_{2.0}
Moonpool;Scale ratio;Periodic response;Reynolds number;Froude number;
 Cited by
Choi, S. Y., Y. G. Lee, K. L. Jeong and Y. J. Ha(2011), Reduction of Added Resistance by Internal Flow Control in the Moonpool of a Drillship, Journal of the Society of Naval Architect of Korea, Vol. 48, No. 6, pp. 544-551. crossref(new window)

Heo, J., J. -C. Park and M. -H. Kim(2011), CFD Analysis of Two-Dimensional Floating Body with Moon Pool under Forced Heave Motion, The Korean Society of Ocean Engineers, Vol. 25, No. 2, pp. 36-46.

Im, N. -K, S. -H. Han and T. N. L. Nguyen(2011), A Study on Ship's Maneuverability Evaluation by Real Ship Test, Journal of the Korean Society of Marine Environment & Safety, Vol. 17, No. 4, pp. 383-389. crossref(new window)

Kim, D. J., J. W. Park, J. N. Kim and U. C. Jeong(2006), An Experimental Study on the Moonpool Characteristics of a Cleaning Ship for Ocean Environment Purification, Journal of Ocean Engineering and Technology, Vol. 20, No. 2, pp. 46-51.

Lee, S. B., B. W. Han, D. W. Park, Y. W. Ahn, S. C. Go and H. W. Seo(2012), Proper Orthogonal Decomposition of Pressure Fluctuations in Moonpool, Journal of the Society of Naval Architects of Korea, Vol. 49, No. 6, pp. 484-490. crossref(new window)

Molin, B.(2001), On the Piston and Sloshing Modes in Moonpools, Journal of Fluid Mechanics, Vol. 430, pp. 27-50. crossref(new window)

Yoo, J. H. and S. H. Choi(2004), Performance of Drillship with Moonpool and Azimuth Thrusters. Journal of the Society of Naval Architects of Korea, Vol. 41, No. 6, pp. 33-39.