Kurniawan, Adi Lembar hasil Penilaian Sejawat Jurnal Ilmiah : aSkin-Friction Drag Measurement Over A Recently Cleaned And Painted Ship Hull Under Steady Cruising Via In-Situ Laser-Based Measurement Coupled With Empirical Estimation. Sekolah Vokasi, Universitas Diponegoro.

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Abstract

A study in assessing the drag penalty due to hull roughness from a recently cleaned and painted ship hull is reported. The
experiment is conducted on an operating ship (Roll-on/roll-off ferry) under steady cruising by measuring the velocity
profile directly over the hull using a Laser Doppler Anemometer (LDA). The use of LDA allows a non-intrusive in-situ
measurement without perturbing the flow over the ship hull. Here a window was installed on the underside of the hull,located approximately 25.5 m downstream of the bow of the ship during its annual dry-docking and hull cleaning.The insitu measurement is also accompanied by surface scanning and a new empirical estimation technique that is based on average roughness height and effective slope. Initial results show that there is a substantial increase in skin-friction drag for a recently cleaned ship-hull compared to the hydrodynamically smooth surface.

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