Analisis Numerik Pengaruh Pemberian Pola Denticle Ikan Hiu Sebagai Vortex Generator Pada Lambung Kapal

Rudyanto, Juliko Naufal (2024) Analisis Numerik Pengaruh Pemberian Pola Denticle Ikan Hiu Sebagai Vortex Generator Pada Lambung Kapal. Other thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Vortex generator adalah suatu alat yang dapat mempercepat terjadinya perubahan aliran dari laminar boundary layer menjadi turbulen boundary layer sehingga secara umum dapat menyebabkan aliran melekat lebih lama dan membantu gaya angkat. Sama halnya dengan ikan hiu, permukaan kulit hiu khususnya hiu perenang cepat yang berbentuk dermal denticle dapat mengurangi gesekan air saat mengalir melalui permukaan dan menciptakan gaya vortex. Desain dari vortex generator dapat beragam, termasuk mengadaptasi dari bentuk sisik ikan Hiu. Dermal denticle merupakan suatu bentuk permukaan yang menyerupai gerigi dengan cekungan yang berulang. Simulasi aliran fluida pada vortex generator menggukana CFD Fluent dengan beberapa variasi angle of attack dari vortex generator antara lain 5, 10, 15, 20, dan 25 derajat. Perbandingan nlai Coefficient of Drag ter kecil pada simulasi dengan vortex generator dan tanpa vortex generator sebesar 0,00035 (0,77%). Perbandingan nilai Coefficient of Lift pada simulasi dengan vortex generator dan tanpa vortex generator sebesar 60.5%. Coefficient of drag terendah dihasilkan oleh simulasi dengan angle of attack 5 derajat dengan nilai 0.04544, Coefficient of lift terbesar dihasilkan oleh simulasi dengan angle of attack 15 derajat dengan nilai 0.0040771, Berdasarkan lift dan drag ratio, angle of attack paling optimal didapatkan pada sudut 15 derajat dengan L/D ratio sebesar 0,08894. Dari simulasi yang telah dilakukan, hasil terbaik (lift/drag ratio terbesar) didapatkan pada variasi angle of attack 15 derajat. ========================================================================================================================A vortex generator is a device that accelerates the transition of flow from a laminar boundary layer to a turbulent boundary layer. This generally leads to prolonged flow attachment and contributes to lift generation. Similar to Sharks, the surface of Shark skin, particularly in fast-swimming Sharks, features dermal denticles that reduce water friction as it flows over the surface and create vortex forces.Vortex generator designs can vary, including adaptations from the shape of Shark skin scales. Dermal denticles are a serrated surface form with recurring depressions. Different denticle patterns are found on different Shark species. Fast-swimming Sharks like the mako Shark exhibit denser denticle patterns, while slow-swimming Sharks like the Greenland Shark have more spaced-out denticles.Computational fluid dynamics (CFD) simulations using Fluent were conducted on a vortex generator with varying angles of attack (5, 10, 15, 20, and 25 degrees). The comparison of the smallest Coefficient of Drag values between simulations with and without the vortex generator was 0.00035 (0.77%). The comparison of the Coefficient of Lift values between simulations with and without the vortex generator was 60.5%. The lowest Coefficient of Drag was obtained from the simulation with an angle of attack of 5 degrees with a value of 0.04544, while the highest Coefficient of Lift was obtained from the simulation with an angle of attack of 15 degrees with a value of 0.0040771. Based on the lift-to-drag ratio, the most optimal angle of attack was found to be 15 degrees with an L/D ratio of 0.08894. The simulations revealed that the best result (highest lift-to-drag ratio) was achieved at an angle of attack of 15 degrees.

Item Type:	Thesis (Other)
Uncontrolled Keywords:	Vortex Generator, Aliran, Denticle, Fluida, Hiu, Vortex Generator, Flow, Denticle, Fluid, Shark
Subjects:	V Naval Science > VM Naval architecture. Shipbuilding. Marine engineering > VM161 Ships--Hydrodynamics
Divisions:	Faculty of Marine Technology (MARTECH) > Marine Engineering > 36202-(S1) Undergraduate Thesis
Depositing User:	Juliko Naufal Rudyanto
Date Deposited:	09 Aug 2024 03:18
Last Modified:	09 Aug 2024 03:18
URI:	http://repository.its.ac.id/id/eprint/114072

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