Transformation of a Separated Turbulent Flow in a Conical Dimple at the Wall of a Narrow Channel and Reduction in Hydraulic Losses as Conicity Increases

2021 ◽  
Author(s):  
S. A. Isaev ◽  
D. V. Nikushchenko ◽  
A. G. Sudakov ◽  
N. V. Tryaskin ◽  
L. P. Iunakov
Keyword(s):  
Turbulent Flow ◽  
Narrow Channel ◽  
Hydraulic Losses

Experimental study of transition from laminar to turbulent flow in vertical narrow channel

2012 ◽  
Vol 47 ◽  
pp. 85-90 ◽  
Author(s):  
Wang Chang ◽  
Gao Pu-zhen ◽  
Wang Zhan-wei ◽  
Tan Si-chao
Keyword(s):  
Experimental Study ◽  
Turbulent Flow ◽  
Narrow Channel

scholarly journals Трансформация отрывного турбулентного течения в конической лунке на стенке узкого канала и снижение гидравлических потерь c увеличением конусности

2021 ◽  
Vol 47 (11) ◽  
pp. 21
Author(s):  
С.А. Исаев ◽  
Д.В. Никущенко ◽  
А.Г. Судаков ◽  
Н.В. Тряскин ◽  
Л.П. Юнаков
Keyword(s):  
Low Frequency ◽  
Separated Flow ◽  
Narrow Channel ◽  
Vortex Structures ◽  
Periodic Mode ◽  
Sharp Transition ◽  
Modified Model ◽  
Hydraulic Losses ◽  
Low Frequency Oscillations

Based on the solution of the URANS closed with a modified model of turbulence MSST, the separated flow in a narrow channel with a conical dimple on the wall with a coning angle of θ was calculated. It is noted that there is a sharp transition from the periodic mode with two alternately changing vortices in close to cylindrical (θ = 10о-22.5о) dimples to modes with periodic low-frequency oscillations of inclined mono-tornado structures at moderate θ (30о-37.5о) and with steady vortex structures at θ above 45о. Relative hydraulic losses in the irradiated section of the channel with an increase in θ remain at the level of 1.23-1.24 to θ = 45о, and then quickly decrease by almost 1.5 times to 1.16 at θ = 60о.

An Introduction to Turbulent Flow

2000 ◽  
Author(s):  
Jean Mathieu ◽  
Julian Scott
Keyword(s):  
Turbulent Flow

Modal Analysis of Turbulent Flow near an Inclined Bank–Longitudinal Structure Junction

2021 ◽  
Vol 147 (3) ◽  
pp. 04020100
Author(s):  
Nasser Heydari ◽  
Panayiotis Diplas ◽  
J. Nathan Kutz ◽  
Soheil Sadeghi Eshkevari
Keyword(s):  
Turbulent Flow ◽  
Modal Analysis ◽  
Longitudinal Structure
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