STUDI NUMERIK KARAKTERISTIK ALIRAN TIGA DIMENSI DI SEKITAR BODI MOBIL SAPUANGIN 8 URBAN CONCEPT DENGAN RASIO GROUND CLEARANCE TERHADAP PANJANG MODEL (C/L) 0.038

SAMSUL, RIZAL (2014) STUDI NUMERIK KARAKTERISTIK ALIRAN TIGA DIMENSI DI SEKITAR BODI MOBIL SAPUANGIN 8 URBAN CONCEPT DENGAN RASIO GROUND CLEARANCE TERHADAP PANJANG MODEL (C/L) 0.038. Undergraduate thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Mobil sapuangin merupakan mobil prototype masa depan
dengan konsep hemat energi yang mengacu pada optimalisasi
segi aerodinamikanya, dimana geometri kendaraan ini sudah
dirancang sangat streamline. Dalam pengoperasiannya pada
bilangan reynolds yang rendah beresiko terhadap separasi aliran
di buritan. Deskripsi terbentuknya separasi di buritan dapat
diperkuat dengan efek yang ditimbulkan oleh ground clearance
dan efek dari side body. Semakin kecil jarak ground clearance
maka akan semakin besar potensi terbentuknya blockage effect
pada daerah interaksi antara bagian bawah leading edge dengan
jalan. Aliran cenderung terdefleksi dengan sangat cepat menuju
upperside yang seakan-akan menerima sudut serang positif
sehingga menggeser posisi titik minimum pressure lebih kedepan.
Pada akhirnya, separasi di rear end pun lebih cepat terjadi..
Penelitian ini dilakukan dengan menggunakan metode
numerik (CFD) dengan software Fluent 14.0, karena metode
numerik dapat menampilkan hasil observasi dan visualisasi yang
mendetail. Pemilihan kondisi simulasi digunakan model
turbulensi k-ε realizable. Rasio ground clearance terhadap
panjang model (c/l) 0.038, ReL = 1.9775 x 106, boundary
condition untuk outlet adalah pressure outlet dan untuk inlet
adalah velocity inlet sebesar 11,11 m/s.
Dari penelitian ini diharapkan dapat dipelajari
karakteristik aliran dua dimensi dan tiga dimensi disekitar model
sapuangin 8 urban concept dengan pengaruh rasio ground
clearance terhadap panjang model(c/l) sebesar 0,038. Hasil post
processing kuantitatif yang didapatkan berupa distribusi
koefisien tekanan, serta koefisien drag dan koefisisen lift. Dari
hasil post processing menunjukan bahwa bodi sapuangin 8 urban
concept terbukti sangat aerodinamis dengan memiliki nilai
koefisien drag (CD) sebesar 0,17 dan koefisien lift (CL) sebesar
−0,0582.

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The car of sapuangin is the future prototype car with ecofriendly
concept one of optimize is aerodynamics, where the
geometry of this vehicle has been designed very streamlined. The
car is operating with low Reynolds number that very risk for flow
separation at the stern. Description of the formation of separation
at the stern could be strengthened by the effects of ground
clearance and side effects of the body. The smaller ratio of
ground clearance will be increase blockage effect on the
interaction leading edge zone with ground. There is a tendency
that flow deflected to the upper side as though it accept a positive
angle of attack, so this condition can move pressure minimum
point forward. Because of that separation in rear end occur
faster.
This numerical research was carried out by numerical
methods (CFD) through software Fluent 14.0., because numerical
methods can explained result of observation and detailed
visualization of the flow characteristics. Computational turbulent
model was set k-ε realizable. The test configuration is enforced
with C/L = 0,038, ReL = 1.9775 x 106, boundary condition for
outlet is the pressure outlet and for inlet is the velocity inlet at
11,11 m/s.
Results from this research can learning the flow
characteristics of two-dimensional and three-dimensional around sapuangin 8 urban concept model about ground clearance ratio
for length of model (c/l=0,038). From the results of quantitative
post processing obtained distribution of pressure coefficient, drag
coefficient and lift coefficient. From the results of post processing
showed that sapuangin 8 urban concept body has proven to be
more aerodynamic with a drag coefficient value of 0,17 and
−0,0582 for lift coefficient (CL)

Item Type:	Thesis (Undergraduate)
Additional Information:	RSM 620.106 4 Riz s
Uncontrolled Keywords:	sapuangin, aerodinamika, ground clearance, midspan, sidebody, CFD, pemodelan 2D, pemodelan 3D, CP, CD, CL.
Subjects:	T Technology > TJ Mechanical engineering and machinery T Technology > TJ Mechanical engineering and machinery > TJ799 Diesel motor--Electronic control. T Technology > TL Motor vehicles. Aeronautics. Astronautics
Divisions:	Faculty of Industrial Technology > Mechanical Engineering > 21201-(S1) Undergraduate Thesis
Depositing User:	Mr. Tondo Indra Nyata
Date Deposited:	17 Jan 2017 04:25
Last Modified:	22 Jan 2017 22:24
URI:	http://repository.its.ac.id/id/eprint/1637

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