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ITS » Paper and Presentation » Rekayasa Konversi Energi - S2
Posted by fandikaaqsa@its.ac.id at 05/11/2015 14:02:46  •  800 Views


STUDI NUMERIK 2D UNSTEADY-RANS PENGARUH PENAMBAHAN SQUARE DISTURBANCE BODY TERHADAP REDUKSI GAYA DRAG CIRCULAR CYLINDER PADA SALURAN SEMPIT

NUMERICAL STUDY 2D UNSTEADY-RANS ABOUT THE INLUENCE OF SQUARE DISTURBANCE BODY ON THE DRAG FORCE REDUCTION OF CIRCULAR CYLINDER IN A NARROW CHANNEL

Author :
RINA ( 2112202009 )




ABSTRAK

Penelitian untuk mengetahui karakteristik aliran di sekitar bluff body telah mengalami perkembangan melalui filosofi boundary layer. Boundary layer sangat berkontribusi dalam pengurangan gaya drag di sekitar body yang dilalui fluida karena adanya pengaruh shear layer. Shear layer pada permukaan body dipengaruhi oleh distribusi tekanan yang terjadi pada kontur body. Drag yang ditimbulkan akibat interaksi shear layer dengan permukaan body sangatlah tidak diinginkan sehingga dilakukanlah manipulasi atau kontrol medan aliran salah satunya dengan menempatkan batang pengganggu di depan body utama circular cylinder. Penelitian ini bertujuan untuk membandingkan dan melengkapi penelitian eksperimen pengurangan gaya drag yang telah dilakukan sebelumnya. Penelitian ini dilakukan secara numerik 2D Unsteady-RANS menggunakan CFD software FLUENT 6.3.26 dengan model viscous Turbulence Model Shear- Stress-Transport SST k-969 pada saluran sempit. Geometri body yang disimulasikan adalah circular cylinder sebagai main bluff body dan square cylinder sebagai disturbance body yang ditempatkan di depan main bluff body dengan rasio sD 016 dan sD 0107. Posisi disturbance body divariasikan pada 945 208304 308304 408304 508304 dan 608304 dengan jarak gap 94804mm. Reynolds number berdasarkan diameter silinder yaitu ReD 232x104 dan 312x104 untuk konfigurasi sD 0.16 ReD 348x104 dan 468x104 untuk konfigurasi sD 0.107. Hasil yang diperoleh menunjukkan bahwa penempatan disturbance body berupa square cylinder pada sisi upstream circular cylinder mempercepat transisi aliran dari laminer ke turbulen boundary layer. Reduksi gaya drag yang paling baik terjadi pada silinder dengan sudut SDB 208304 untuk konfigurasi sD 0.16 dan pada sudut SDB 308304 untuk konfigurasi sD 0.107 masing-masing sebesar 81 dan 53 .


ABSTRACT

The research of knowing flow characteristics around a bluff body had undergone a great improvement through boundary layer philosophy. Because of shear layer effectboundary layer contributes greatly in reducing the drag force around the body that are subjected to the fluid flow. This shear layer on body surfaces is affected by the pressure which occurs on body contour. Drag that was caused by the interaction between body surface and the shear layer is highly unwanted therefore it is needed to manipulate the flow area using methods such as placing a disturbance rod in front of the main body circular cylinder. This study aims to compare and complete the previous study about drag force reduction. This study is done numerically in 2 dimension Unsteady-RANS using CFD software FLUENT 6.3.26 using viscous turbulence model shear stress transport SST k-969 in narrow channel. A circular cylinder is simulated as main bluffbody and square cylinder as disturbance body which is positioned ahead of main body according to ratio sD 0.16 to sD 0.107. Disturbance body is positioned variably at 945 20304050 and 60 with gap 948 0.4 mm. Reynolds number according to cylinder diameter is 2.32 x 104 and 3.12 x 104 for sD 0.16 configuration 3.48 x 104 and 4.68 x 104 for sD 0.107 configuration. The study result shows that positioning disturbance body on the upstream circular cylinder hasten the flow transition from laminar to turbulent boundary layer. The best drag force reduction occurs at 81 on cylinder with SDB angle 208304 for sD 0.16 configuration and 53 on cylinder SDB angle 308304 for sD 0.107 configuration.



KeywordsBody pengganggu square clylinder; shear-stress- transport (SST) ; koefisien drag pressure; saluran sempit; gaya drag; unsteady
 
Subject:  Dinamika fluida
Contributor
  1. Dr. Wawan Aries Widodo, ST., MT
Date Create: 05/11/2015
Type: Text
Format: PDF
Language: Indonesian
Identifier: ITS-paper-21121150007940
Collection ID: 21121150007940
Call Number: RTM 620.106 4 Rin s


Source
Paper and Presentations of Machine Engineering, RTM 620.106 4 Rin s, 2014R

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Copyright @2015 by ITS Library. This publication is protected by copyright and per obtained from the ITS Library prior to any prohibited reproduction, storage in a re transmission in any form or by any means, electronic, mechanical, photocopying, reco For information regarding permission(s), write to ITS Library




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