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ITS » Undergraduate Theses » Teknik Mesin
Posted by fandikaaqsa@its.ac.id at 30/03/2016 09:45:55  •  1005 Views


NUMERICAL STUDY OF TURBULENCE MODEL ON FLUID FLOW THROUGH A SINGLE HEATED CYLINDER

Author :
RIZAL, SYAIFUL ( 2112105036 )




ABSTRAK

Fenomena gerakan aliran fluida melintasi suatu benda bluff body memegang peranan penting dalam aplikasi engineering seperti pada penukar kalor pembakaran dan alat transportasi. Dengan memvariasikan bilangan Reynolds berbagai pola aliran dan karakteristik vortex shedding pada wake dari sebuah silinder sirkular telah diamati dan dibahas dalam berbagai literatur Namun karakteristik wake pada silinder sirkular yang dipanaskan lebih rumit untuk dianalisa secara fisik karena pengaruh gaya apung bouyancy pada fenomena viscous yang terjadi. Berdasarkan pemikiran diatas maka dilakukan penelitian tentang evaluasi berbagai variasi turbulensi model pada kasus aliran fluida melewati silinder yang dipanaskan.. Penelitian ini dilakukan secara numerik dengan perangkat lunak Fluent 6.3.26 dengan model solver unsteady. Dua nilai Reynold Number yang berbeda masing masing Re135 dan Re1000. Nilai dari Richardson Number juga diatur tetap pada nilai 0 dan 1 untuk Re135 sedangkan untuk Re1000 digunakan nilai Ri0 dan Ri2.77. Kemudian model viscous yang digunakan adalah Laminar model dan dua turbulensi model yaitu k-949 realizble dan k-969 SST. Dimana fluida yang digunakan adalah air pada boundary condition. Kemudian hasil dari penelitian ini akan dibandingkan dengan hasil eksperimen yang sebelumnya telah dilakukan. Dari penelitian yang telah dilakukan dapat diketahui bahwa tererdapat perbedaan hasil dari nilai Strouhal Number Dengan memvariasikan nilai dari time step yang digunakan selama proses iterasi. Dimana semakin kecil nilai time step yang digunakan semakin akurat hasil yang didapatkan. Dan untuk analisa turbulensi model secara keseluruhan k-969 SST memiliki hasil yang paling mendekati eksperimen berdasarkan parameter parameter yang diamati.


ABSTRACT

The phenomenon of the movement of fluid flow across an object bluff body plays an important role in engineering applications such as heat exchangers combustion and transportation. By varying the Reynolds number different flow patterns and characteristics of the vortex shedding in the wake of a circular cylinder has been observed and discussed in the literature but the wake characteristics of circular heated cylinder is more complicated to be analyzed because of the influence of physical buoyancy on the viscous phenomena occur. Based on the above ideas then conducted research on the evaluation of a wide variety of turbulence models in the case of fluid flow through a heated cylinder. This research was carried out numerically with the software Fluent 6.3.26 with unsteady solver models. Two different value of Reynolds Number respectively - each Re 135 and Re 1000. The value of the Richardson Number is also set fixed at a value of 0 and 1 for Re 135 while for Re 1000 used the value Ri 0 and Ri 2.77. Later models used are Laminar viscous model and two turbulence models namely k-949 realizble and k-969 SST. Where is the fluid used is water on the boundary condition. Then the results of this study will be compared with the results of previous experiments that have been carried out. From the research that has been done it is known that there are differences in the results of the value of Strouhal number by varying the value of time step used during the iteration process. Where the smaller the value of time step used the more accurate the results obtained. And for the overall analysis k-969 SST turbulence models has the closest experimental results based on parameters were observed.



KeywordsSilinder yang dipanaskan (heated cylinder) ; turbulensi model; aliran unsteady
 
Subject:  Dinamika fluida
Contributor
  1. Vivien Suphandani Djanali, ST, ME, PhD
Date Create: 30/03/2016
Type: Text
Format: PDF
Language: Indonesian
Identifier: ITS-Undergraduate-21001150008611
Collection ID: 21001150008611
Call Number: RSM 620.106 4 Riz s


Source
Undergraduate Thesis of Mechanical Engineering, RSM 620.106 4 Riz s, 2014

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Copyright @2016 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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  1.  ITS-Undergraduate-40974-2112105036_Abstract_id.pdf - 216 KB
  2.  ITS-Undergraduate-40974-2112105036_Abstract_en.pdf - 220 KB
  3.  ITS-Undergraduate-40974-2112105036_Conclusion.pdf - 221 KB




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