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Jurnal Energi Dan Manufaktur
Published by Universitas Udayana
ISSN : 23025255     EISSN : 25415328     DOI : -
Core Subject : Science, Engineering,
Energy Industrial & Manufacturing Engineering
"Jurnal Energi dan Manufaktur" is a journal published by Department of Mechanical Engineering, University of Udayana, Bali since 2006. During 2006-2011 the journal's name was "Jurnal Ilmiah Teknik Mesin CAKRAM" (Scientific journal in mechanical engineering, CAKRAM). "Jurnal Energi dan Manufaktur" is released biannually on April and October, respectively. We invite authors to submit papers from experimental research, review work, analytical-theoretical study, applied study, and simulation, in related to mechanical engineering (energy, material, manufacturing, design) to be published through "Jurnal Energi dan Manufaktur".
Arjuna Subject : -
Articles 387 Documents
 9   10   11   12   13 
Kekuatan Lentur Komposit Sandwich Serat Tapis Kelapa Dengan Core Kayu Albasia I Made Astika; I Gusti Komang Dwijana
Jurnal Energi Dan Manufaktur Vol 9 No 1 (2016): April 2016
Publisher : Department of Mechanical Engineering, University of Udayana

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Abstract

Abstrak:Tujuan penelitian ini adalah untuk menyelidiki kekuatan lentur komposit sandwich serat tapis kelapa bermatrik polyesterdengan core kayu albasia. Bahan penelitian adalah serat tapis kelapa dengan panjang 15 mm (acak), resin unsaturatedpolyester 157 BQTN, kayu albasia dan hardener jenis MEKPO dengan konsentrasi 1%. Komposit sandwich tersusunatas dua skin dengan core ditengahnya dan dibuat dengan metode cetak tekan hidrolis. Lamina komposit sebagai skinterbuat dari serat tapis kelapa-polyester dengan fraksi volume serat 30%. Core yang digunakan adalah kayu albasiayang dipotong pada arah melintang dengan variasi ketebalan 5, 10, 15 dan 20 mm. Spesimen dan prosedur pengujianlentur mengacu pada standar ASTM C 393. Penampang patahan dilakukan foto makro untuk mengidentifikasi polakegagalannya. Hasil penelitian menunjukkan bahwa kekuatan lentur komposit sandwich semakin meningkat seiringdengan penambahan ketebalan core. Tegangan lentur komposit sandwich mempunyai nilai yang optimum padaketebalan core 15 mm. Pola kegagalan komposit sandwich yang teramati adalah kegagalan tarik pada skin kompositbagian bawah, kegagalan geser core, delaminasi skin komposit bagian atas dengan core dan kegagalan tekan skinkomposit bagaian atas.Kata kunci: komposit sandwich, albasia, kekuatan lentur, pola kegagalanAbstract:The purpose of this study was to investigate the flexural strengt of composite sandwich coconut filter fiber with albasiawood as a core. The research material is coconut filter fiber with 15 mm lenght, 157 BQTN unsaturated polyester resin,albasia wood and 1% hardener types MEKPO. Composite sandwich composed of two skins with a core in the middleand production method are a hydraulic press molding. Lamina composite as a skin made of coconut filter fiber with 30%volume fraction. Core used is albasia wood with variations in the thickness of 5, 10, 15 and 20 mm. The specimens andtesting procedures based on ASTM standards C 393. The failure of the composite sandwich will be identify by macrofotos. The results of research show that the flexural strength of composite sandwich increasing with the addition of corethickness. Flexural stress in composite sandwich has the optimum value on core thickness of 15 mm. Failure mode ofcomposit sandwich is drag failure of the bottom composite skin, shear failure of the core, delamination and the pressfailures of the top composite skin.Keywords: composite sandwich, albasia, flexural strength, failure mode
Komposisi bahan organik sebagai alternatif bahan gesek rem sepeda motor A.A. Alit Triadi; I Made Nuarsa
Jurnal Energi Dan Manufaktur Vol 10 No 1 (2017): April 2017
Publisher : Department of Mechanical Engineering, University of Udayana

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Abstract

Abstrak: Semua produk komponen kendaraan di masa depan mengikuti regulasi ramah terhadap lingkungan (environtmental friendly), bahan baku dan dalam pemanfaatannya semaksimal mungkin tidak berbahaya bagi mahluk hidup. Demikian pula pada produk kampas rem (brake shoes) harus mengikuti regulasi tersebut. Tujuan yang ingin dicapai dari penelitian ini adalah diperoleh bahan gesek rem alternatif yang ramah lingkungan dan memenuhi aspek teknis. Metode yang akan digunakan untuk mencapai tujuan tersebut adalah dengan melakukan eksperimen dilaboratorium. Langkah pertama, adalah melakukan variasi eksperimen penggunaan material kampas rem yang berbasis organik dalam bentuk spesimen uji (Komposisi I : tempurung kelapa 45%, serbuk kayu 20%, serabut kelapa 10%; Komposisi II : tempurung kelapa 35%, serbuk kayu 20%, serabut kelapa 20% ; Komposisi III : tempurung kelapa 25%, serbuk kayu 20%, serabut kelapa 30% . Adapun perekat yang digunakan adalah resin fenolic dengan persentase 25% untuk semua komposisi. Berdasarkan penelitian yang telah dilakukan didapat kuat tarik terendah 0,265 MPa pada benda uji komposisi II. Kuat tarik tertinggi 0,588 MPa pada komposisi benda uji III. Kekerasan terendah 43,141 HBN pada benda uji komposisi II, kekerasan tertinggi 97,417 HBN pada benda uji komposisi III. Keausan terendah 0,022 mm3/s pada benda uji komposisi III, keausan tertinggi 0,04 mm3/s pada benda uji komposisi II. Kata kunci: Produk, Kampas rem, Sifat mekanik, organik, ramah lingkungan Abstract: The components of the vehicle in the future have to follow the eco-friendly regulation, where the utilization of the raw materials as much as possible isnot harmful to the environment. Likewise, the brake productssuch brake shoes must follow these regulations. The aim of this researchis to provide an eco-friendly brake shoes belong to the technical aspects. Therefore laboratory experiments were established by arranging the composition of materials brake-based organic. The composition of each brake shoes that consists of coconut shell, sawdust, coconut fibers and adhesivewere arranged. It was obtained the lowest and highest tensile strength, hardness, and wearness for each brake shoes depend on the compositions. Keywords: Brake shoes, mechanical properties, organic based material, eco-friendly
Penerapan Metode Sentrifugal pada Proses Pengecoran Produk Komponen Otomotif Velg Sepeda Motor Waluyo M Bintoro; Undiana B; Duddy Y P
Jurnal Energi Dan Manufaktur Vol 6 No 2 (2013): Oktober 2013
Publisher : Department of Mechanical Engineering, University of Udayana

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Abstract

AbstrakPerkembangan industri pengecoran semestinya tidak terlepas dari penelitian awal tentangpembelajaran yang ada di lingkungan sekolah. Sehingga satu produk yang baik adalah produkyang terlebih dahulu diteliti dan diuji dalam lingkungan industry dalam sekolah, sehinggamembuat rasa puas ketika menggunakannya, dan salah satu produk itu adalah velg, part yangdigunakan pada roda sepeda motor. Tetapi sayangnya velg yang ada sering dikeluhkankarena kualitasnya rendah. Untuk memperbaiki kualitas velg agar dapat diterima olehkonsumen, maka kualitasnya harus ditingkatkan melalui proses pembuatannya. Baik metodadan teknik penambahan paduan dicoba dengan menggunakan proses vertical centrifugalcasting (VCC) pada putaran 1000 Rpm dengan penambahan inokulan sebagai unsurpenghalus butir, inokulan akan dicampurkan kedalam 5 kg cairan aluminium dengan rasiovariasi campuran tertentu untuk selanjutnya dituangkan ke dalam cetakan denganmenggunakan temperature awal 250oC pada cetakan logam. Selanjutnya velg lokal dan velgVCC diuji secara fisis dan mekanis menggunakan pengujian standar yaitu; uji kekerasan, ujitarik dan uji impak dengan menggunakan Standar pengujian ASTM dan struktur mikronya.Pengamatan struktur mikro menunjukkan bahwa ukuran butiran pada tuangan sentrifugalakan semakin halus butirannya pada sisi terluar. Penjelasan dari hasil pengamatan inidisebabkan karena adanya gaya sentrifugal (CF) selama proses penuangan kedalam cetakan.Logam cair akan dilempar oleh gaya sentrifugal sehingga menimbulkan tekanan pada setiaplayer, hal ini juga menjelaskan bahwa produk yang dibuat dengan menggunakan metoda inibebas cacat, sisi terluar dari produk sentrifugal akan memiliki sifat mekanis yang baikdibandingkan dengan sisi tengah produk akibat tekanan gaya sentrifugal. Temperatur cetakanjuga berpengaruh pada nilai kekerasan produk dari metoda ini.Kata kunci: Vertikal centrifugal casting, cetakan logam, temperature cetakanAbstractThe improvement of the foundry industry should not be miss from the initial research studyabout studying in school environment. At the beginning a good product is a product that arechecking and testing in the school industry environment, so this can be make satisfying a user,one of the products is a motor cycle rim, the part that used in motorcycle wheels. Unfortunatelythe motorcycle wheel that existing in the local market has a bad quality, then the manufacturingof it must be correcting to increasing the quality. The method and inoculated added of alloyingare used in vertical centrifugal casting process with 1000 rpm mixing in certain ratio ofinoculation as a refinery grain in 5 kg melting aluminum than pouring it into the 250oC moldingtemperature. Then the vertical centrifugal casting (VCC) product and local motorcycle wheeltested physically and mechanically using a standard testing such as; Hardness testing, tensiletesting, impact as mention in ASTM standard test and also the micro structure of it. Referringfrom the micro structure shown that the grain size of the as cast a smoother in the outside sideof the rim wheel. The explanation of it cause of the centrifugal force (CF) working during thepouring melting metal to the mould, the melting metal is throwing to the far side (Outside) ofcentre mould with the radial/centrifugal force creating pressure in the cavity, it’s also explain thatproduct who produce with this method are free from casting defect, the outside side ofcentrifugal casting has a good mechanic properties comparing with mechanic properties in themiddle/centre side. However the mould temperature will influence to the hardness of thisproduct.Keywords: Vertical centrifugal casting, permanent mold, mold temperature.
AGING CHARACTERISTIC AND MECHANICAL PROPERTIES OF FORMED MG-ZN-AL-RE-CA ALLOYS I Nyoman Gde Antara
Jurnal Energi Dan Manufaktur Vol 3, No.2 Desember 2008
Publisher : Department of Mechanical Engineering, University of Udayana

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Abstract

Abstrak The present study focused on aging characteristic and mechanical properties of semi solid formed Mg-Zn-Al-RE-Ca alloys. The alloys are divided into Mg-8%Zn-4%Al-0.6%Ca and Mg-6%Zn-3%Al-0.6%Ca based alloys, and rare earth elements were added in the range from 1 to 3 mass% (hereafter ZAE841, ZAE842, ZAE843 and ZAE631, ZAE632, ZAE633). The alloy specimens were strained, press-formed at 580?C and extracted to prepare specimens for T-6 heat treatment and tensile investigations. The results show that all of the alloys exhibit microstructure that consisting of fine spherical ? particles and fine eutectic compounds around the particles. The peak hardness of the alloys was mainly reached when the solution heat treatment is conducted at temperature of 330?C for 16 hours and aging at 175?C for 32 hours. The hardness numbers increase with increasing content of the alloying elements. Tensile properties at high temperature of semi-solid formed alloys increase in accordance with increasing the amount of compounds. The amounts of compound increase as the alloying element increase.
Mekanisme Aus Baja Karbon AISI 1065 pada Permukaan Kontak Basah Akibat Beban Kontak Gelinding-Luncur I Made Widiyarta; I Made Parwata; I Made Gatot Karohika; I Putu Lokantara; Made Arie Satryawan
Jurnal Energi Dan Manufaktur Vol 8 No 1 (2015): April 2015
Publisher : Department of Mechanical Engineering, University of Udayana

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Abstract

Dalam proses kontak gelinding-luncur, permukaan kontak yang basah karenaterperangkapnya air di daerah permukaan kontak dapat mengurangi kontak adhesi [Chen etal., Wear 253 (2002)]. Kondisi tersebut mungkin dapat mempengaruhi mekanismekegagalan aus material. Pada penelitian ini, tingkat keausan dan mekanisme aus materialakibat beban gelinding-luncur pada kondisi permukaan kontak basah diinvestigasi. Ujikeausan dilakukan dengan alat uji kontak dua disk dan material uji dipilih adalah baja karbon0.65%C dengan tekanan maksimum 750MPa dan rasio slip-roll 5%. Untuk uji aus padakondisi kontak basah, air diteteskan secara kontinyu pada permukaan kontak disk. Dari hasiluji terlihat dengan adanya air dipermukaan kontak, tingkat keausan yang terjadi mengalamipenurunan yang cukup besar sekitar 50% yaitu dari 6x10-4 ?m/putaran untuk kontak keringmenjadi 3x10-4 ?m/putaran pada kontak basah. Hal ini dapat terjadi mungkin diakibatkanoleh air yang ada dipermukaan kontak mampu membatasi areal kontak antara dua meterialkontak tersebut sehingga menurunkan gesekan yang terjadi dan mengakibatkan keausanmenurun. Pada kontak basah, material yang mengalami regangan geser plastis hanyaterjadi higga kedalaman kurang dari 100 ?m dan pada kontak kering regangan geser plastisdapat terjadi hingga kedalaman sekitar 400 ?m.Kata kunci: Baja karbon, kontak basah, ausIn rolling-sliding contact, the wet surface as a result of water trapped in the contact area canreduce adhesion [Chen et al., Wear 253 (2002)]. This condition may influence themechanism of wear on the contact material. In this work, the wear rate and wearmechanism of material on the wet contact surface were investigated. Wear test wasconducted using disc-to-disc contact test and carbon steel (0.65%C) was chosen as the testmaterial with the maximum pressure of 750MPa and slip-roll ratio of 5%. For the wear testwith the wet contact, water was dropped continuously on the contact surface. The resultsshow the wear rate on the material with wet contact was decrease significantly by about 50%i.e., from about 6x10-4 ?m/cycle for the dry contact to about 3x10-4 ?m/cycle for the wetcontact. This may be caused by the water trapped on the contact area reduces the contactadhesion between both the contact materials and causes the friction to decrease, andresulting wear to decrease. For the wet contact, the plastic shear strain on material occurredinto depth less than 100 ?m, and for the dry contact, the plastic shear strain on materialoccurred into depth about 400 ?m..Keywords: Carbon steel, wet contact, wear
Performansi Kolektor Surya Tubular Terkonsentrasi Dengan Pipa Penyerap Dibentuk Anulus Dengan Variasi Posisi Pipa Penyerap Made Sucipta; Ketut Astawa; A.A. Kade Argha Dharmawan
Jurnal Energi Dan Manufaktur Vol 5, No.1 April 2011
Publisher : Department of Mechanical Engineering, University of Udayana

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Abstract

Berdasarkan geometrinya salah satu jenis kolektor surya adalah kolektor tubular. Kolektor tubular adalah sebuahkolekor surya konsentris, dimana antara kaca penutup (cover) dan pipa penyerap (absorber) membentuk anulus. Pipapenyerap berada disebelah dalam sedangkan kaca penutup dengan diameter yang lebih besar berada di sebelah luar. Saatini kaca penutup pada kolektor tubular hanya difungsikan untuk menghalangi panas terbuang ke lingkungan. Selain itukolektor tubular umumnya menggunakan tipe aliran fluida kerja satu arah. Pada penelitian yang telah dilakukan, dibuatrancang bangun sebuah kolektor tubular, dimana dipilih tabung kaca sebagai kaca penutup yang separuh bagiannyadimodifikasi dengan membentuk reflektor pada bagian bawah dan pipa penyerap yang dibuat membentuk anulus denganarah aliran mengikuti anulus.Metode yang umum digunakan untuk mengevaluasi performansi kolektor adalah instantaneous efficiency. Effisiensikolektor merupakan perbandingan panas yang diserap oleh fluida dan intensitas matahari yang mengenai kolektorPerformansi dari kolektor dapat dinyatakan dengan effisiensi temalnya.Eefisiensi aktual kolektor surya tubular terkonsentrasi dengan pipa penyerap dibentuk anulus dan kolektor suryatubular terkonsentrasi dengan pipa penyerap yang dibentuk lurus dengan variasi posisi pipa penyerap pada posisi 5 (L5 = -5,32 cm) lebih tinggi dibandingkan dengan energi berguna aktual (Qu,a) pada posisi L1 = 5,32 cm, L2 = 2,66 cm, L3 = 0 cm,dan L4 = -2,66 cm
Studi konsumsi energi sebagai kajian awal untuk mengetahui & memonitor efisiensi penggunaan energi Ainul Ghurri; Ngurah Putra Wibawa; Hendra Widjaksana
Jurnal Energi Dan Manufaktur Vol 1, No.2 Desember 2006
Publisher : Department of Mechanical Engineering, University of Udayana

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Abstract

Investigation on energy consumption is early step to monitor energy consumption and efficiency. Assessment on energy consumption is aimed to investigate how much energy has been consumed by a company, a region or a country. The growth of energy consumption can show the economic and welfare improvement. From the total energy consumed we can then break down it to the sectors of energy user, e.g. transportation, industry, commercial building, etc. By comparing the total energy consumed to the benefits of energy consumption we can predict the energy efficiency. This research is still early stage and just covers the energy consumption by Balinese society. The fuel and energy consumption by Balinese society was analyzed based on the data from Pertamina branch Denpasar. It was found that the biggest fuel consumed is solar, followed by premium-premix, minyak tanah, LPG, avtur, and avgas, respectively. During 1998 to 2003 the Balinese’s energy consumption increased gradually with changeable fluctuation from 56.63 Peta Joule to 80.53 Peta Joule. The biggest rise was happened in 1999-2000, i.e. 16.43%, and the lowest rise was happened in 2002-2003, i.e. 0.9%. Transportation was the biggest consumer of the Balinese energy, i.e. 69.21% in 2000 and 71.03% in 2001. In order to investigate the energy efficiency, it was found that the energy users have not been used the energy intensity as indicator yet to measure their energy efficiency. Some no uniformity in data classification and the unavailability data caused this research can’t be conducted more precise and detail yet.
Analisis Kekuatan Struktur Pallet Menggunakan Metode Elemen Hingga Tria Mariz Arief; Sugianto Sugianto
Jurnal Energi Dan Manufaktur Vol 7 No 1 (2014): April 2014
Publisher : Department of Mechanical Engineering, University of Udayana

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Abstract

Pallet sebagai suatu alat bantu untuk mempermudah proses bongkar-muat logistik. Palletdigunakan hampir dalam berbagai lingkungan transportasi logistik. Pada bahasan berikutdikhususkan dalam lingkup transportasi di dalam pesawat udara khususnya pada pesawatangkut militer. Di lingkungan militer pallet digunakan untuk transport logistik baik secara normalmuat (loading) dan bongkar (unloading) maupun kondisi bongkar dengan diterjunkan daripesawat udara. Untuk pemenuhan penggunaan tersebut dilakukan perancangan ulang (reverseengineering) struktur pallet yang dapat dimanufaktur secara lokal. Hipotesis awal menunjukkanbahwa berdasarkan kondisi pembebanan pada pallet dapat diperkirakan bahwa kondisitegangan dan regangan maksimum akan terjadi pada posisi sudut struktur pallet yang ditransferbebannya ke komponen plat besi penahan siku-siku dan baut. Material yang digunakan padastruktur pallet adalah Allumunium Alloy 7075-T6 dengan kekuatan tarik sebesar 503 MPa.Analisis dilakukan dengan menggunakan simulasi numerik dengan metoda elemen hingga(FEM). Proses simulasi numerik kekuatan struktur pallet difokuskan pada pembebanan statis(termasuk pengaruh factor G) dalam interval beban statis 4 ton sampai 7 ton. Analisis dilakukanpada perubahan variabel tegangan dan regangan terhadap variasi beban yang diberikan untukmendapatkan tingkat keamanan struktur (margin safety). Pemodelan dilakukan denganidealisasi model ¼ bagian menggunakan elemen terstruktur dengan jenis elemen hexahedral(brick) dengan jumlah 73803 elemen dan 360323 node. Hasil analisis menunjukkan teganganekuivalen maksimum struktur Pallet adalah 94 MPa yang terjadi di penguat sudut (anglebracket). Sedangkan pada struktur penguat lapis (sandwich structure) berbahan thick blockyang mempunyai kekuatan sebesar 20 MPa adalah sebesar 0.84 MPa. Tingkat keamanansecara keseluruhan struktur dengan mempertimbangkan factor G hingga 2 adalah 5.3.Kata kunci: Analisis struktur, pallet, logistik, reverse engineering, FEMPallet as a tool is used to simplify the process of loading and unloading logistics. The scope ofthe use of pallets is almost used in various environments logistic transportation. In the followingdiscussion is more specifically in the sphere of transport by aircraft, especially military transportaircraft. Pallet in the military environment is used for both normal logistics transport andunloading and unloading as well as the unloading condition parachuted from an aircraft. To fulfillsuch use redesign (reverse engineering) pallet structure that can be manufactured locally. Thedesign and analysis is done to ensure the strength of the pallet structure. Initial hypothesisindicates that based on the pallet loading conditions can be estimated that the condition ofmaximum stress and strain will occur in the structure of the angular position pallet loadtransferred to the iron plate component retaining bracket and bolt. The material used in thestructure of the pallet is Allumunium Alloy 7075-T6 with a tensile strength of 503 MPa. Analyseswere performed using numerical simulation with finite element method (FEM). Numericalsimulation process force structure focused on static loading pallet (including the effect of factorG) in the interval static load 4 tons to 7 tons. Analysis was performed on variable changes thestress and strain of the load variations to obtain security level structure (margin of safety).Modeling is done with the idealization of the ¼ part model. Modeling is carried out by elementsof structured hexahedral element type (brick) by the number 73803 elements and nodes. Theanalysis showed maximum voltage Equivalent Pallet structure is 94 MPa which occur inamplifier angle (angle bracket). While the structure reinforcement layer (sandwich structure)made of thick block that has strength of 20 MPa is equal to 0.84 Mpa. The overall level ofsecurity structure taking into account the G factor of up to 2 is 5.3.Keywords: Structural analysis, pallet, logistics, reverse engineering, FEM
Formasi Gas Buang Pada Pembakaran Fludized Bed Sekam Padi I Nyoman Suprapta Winaya; I Nyoman Gede Sujana; I G N P Tenaya
Jurnal Energi Dan Manufaktur Vol 4, No.1 April 2010
Publisher : Department of Mechanical Engineering, University of Udayana

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Abstract

Fluidized Bed Combustion is the best technology for energy conversion of various fuel types such as biomass andwastes with low caloric content fuel. Biomass like rice husk has a great potentiality to develop as a fuel since the availability inIndonesia is abundant. This research aims to analyse gas emission from rice husk using fluidied bed combustion. Investigationwas conducted in a laboratory scale fluidized bed unit by varying operation temperature and gas fluidization. The results showthat emission gas of carbon monoxide and NOx at higher temperature of 600 0C was found lower compared to 500 0C at similarair velocity of 0.05 m/s.
Pengaruh Silinder Downstream terhadap Karakteristik Aliran Silinder Upstream Menggunakan Square Disturbance Body Tersusun Tandem Rina Rina; Sanny Ardhy
Jurnal Energi Dan Manufaktur Vol 11 No 2 (2018): Published in Oktober 2018
Publisher : Department of Mechanical Engineering, University of Udayana

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (690.381 KB) | DOI: 10.24843/JEM.2018.v11.i02.p05

Abstract

Fluida yang mengalir di sekitar bluff body silinder sirkular, akan menimbulkan gaya-gaya aerodinamika salah satunya gaya drag. Drag sangat tidak diinginkan untuk keselamatan struktur body. Reduksi gaya drag dilakukan dengan mengontrol medan aliran seperti meningkatkan kekasaran permukaan, mengiris silinder dengan sudut iris tertentu, dan menempatkan pengganggu di sisi upstream silinder. Penelitian ini bertujuan untuk melihat pengaruh silinder downstream terhadap karakteristik aliran silinder upstream menggunakan square disturbance body yang disusun tandem pada saluran sempit. Geometri yang digunakan adalah dua silinder sirkular yang disusun tandem berdiameter (D) 25 mm dengan variasi jarak antar silinder (L/D) 1,5; 2; 2,5; 3; 3,5; 4. Square Cylinder sebagai body pengganggu ditempatkan pada sisi upstream silinder utama berdiamensi 4 mm. Posisi sudut pengganggu (?) 30°, dan jarak gap (d=0.4mm). Reynolds number berdasarkan diameter silinder, yaitu ReD 2,32x104. Penelitian iini dilakukan secara numerik 2D Unsteady-RANS menggunakan CFD software FLUENT 6.3.26 dengan model viscous Turbulence Model Shear-Stress-Transport (SST) k-?. Parameter yang diamati adalah koefisien pressure (Cp), Koefisien drag pressure (Cdp) dan visualisasi aliran berupa velocity pathline. Hasilnya menunjukkan bahwa Penambahan silinder downstream memberikan kontribusi dalam pengurangan gaya drag pada silinder upstream menggunakan square disturbance body. Pengaruh wake silinder upstream terhadap silinder downstream berkurang dengan meningkatnya rasio L/D. Interaksi wake silinder upstream terhadap silinder downstream terjadi pada konfigurasi L/D 1,5 – 3. Pengurangan gaya drag optimum terjadi pada konfigurasi L/D 3. The fluid flows around the circular cylinder bluff body will produce aerodynamic forces, one of which is the drag force. Drag is very undesirable for the safety of the body structure. Reduction of drag force is carried out by controlling the flow field such as increasing the surface roughness, slicing the cylinder with a certain iris angle, and placing the disturbance on the upstream side of the cylinder. This purpose of the study is to see the effect of downstream cylinders on the flow characteristics of upstream cylinders using a square disturbance body arranged tandem in a narrow channel. The geometry used is two circular cylinders arranged in tandem diameter (D) 25 mm with a variation of distance between cylinders (L / D) 1.5; 2; 2.5; 3; 3.5; 4. Square Cylinder as a disturbing body is placed on the side of the main cylinder upstream with a diameter of 4 mm. The position of the disturbing angle (?) is 30 °, and the gap distance (d = 0.4mm). Reynolds number is based on cylinder diameter, ie ReD 2.32x104. This research was carried out numerical 2D Unsteady-RANS using a FLUENT 6.3.26 CFD software with viscous Turbulence model Shear-Stress-Transport (SST) k-? model. Parameters observed were pressure coefficient (Cp), drag pressure coefficient (Cdp) and flow visualization in the form of velocity pathline. The results show that the addition of a downstream cylinder contributes to the reduction of the drag force on the upstream cylinder using a square disturbance body. The wake influence of upstream cylinder to downstream cylinder decreasing with increasing the ratio of L/D. The interaction of wake cylinder upstream to downstream cylinder occurs at L/D 1.5 - 3. The optimum for the drag force reduction occurs at L/D 3.

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