Study of Effects of Turbulence Models, Wall Functions and Upwind Schemes on Main Flow Field and Heat Transfer Features of an Entrance/Exit Flow in a Long 2D Duct

سال انتشار: 1398
محل انتشار: بیست و چهارمین کنفرانس سالانه بین المللی انجمن مهندسان مکانیک ایران
کد COI اختصاصی: ISME24_679
زبان مقاله: انگلیسی
تعداد مشاهده: 305

نویسندگان

Assistant Professor, Mechanical Engineering Group, Shahr-e-Kord University, ۲nd Kilometer of Soumoun Road, Shahr-e-Kord, Iran;

p Orangi

Graduated M.Sc. , Mechanical Engineering Group, Shahr-e-Kord University, ۲nd Kilometer of Soumoun Road, Shahr-e-Kord, Iran;

چکیده

The effects of combinations of important different parameters available in Fluent software for modeling a turbulent internal flow is investigated. The parameters studied are: turbulence models, wall functions, and upwinding schemes. The results for different 54 combinational are compared with experimental ones and with each other. The compared results are: the dimension-less length and height of separation bubbles after the leading edge of the obstacle (at the entrance of the duct) and after trailing edge (after exit), distribution of local Nu number on horizontal wall of the duct, the dimension-less location and value of maximum Nu number, the value of fully developed Nu number and location of reaching such value. Then for the local Nu number at different locations of horizontal wall, the following values were calculated: the error and its percentage; sum, average, maximum and minimum of error and its percentage; absolute error and its percentage in addition to its summation, average, maximum and minimum; square of errors and percentages with their summations. Then four important ones of the mentioned criterions were normalized in order that they could be combined. After studying different combinations of summation of the normalized parameters, the summation of three important ones was proposed to be the criterion for judging about the accuracy of a modeling. Finally, based on this criterion, the 54 models were judged and sorted for their accuracy from the best to the worst. Such a wide statistical investigation and analysis for accuracy of turbulence models, wall functions and upwinding schemes is unique. The final conclusions for accuracy of these 54 combinations can be a great help and guide for researchers in the fluid flow and heat transfer fields.

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