An eddy‐resolving numerical model to study turbulent flow, sediment and bed evolution using Detached Eddy Simulation in a lateral separation zone at the field‐scale

2021 ◽  
Author(s):  
Laura V. Alvarez ◽  
Paul E. Grams
Keyword(s):  
Numerical Model ◽  
Turbulent Flow ◽  
Separation Zone ◽  
Detached Eddy Simulation ◽  
Field Scale ◽  
Lateral Separation ◽  
Eddy Simulation ◽  
Bed Evolution

Detached Eddy Simulation of a Developing Turbulent Flow in a 270° Curved Duct

2008 ◽  
Vol 32 (6) ◽  
pp. 471-478
Author(s):  
Jeong-Sik Seo ◽  
Jong-Keun Shin ◽  
Young-Don Choi ◽  
Joo-Cheol Lee
Keyword(s):  
Turbulent Flow ◽  
Detached Eddy Simulation ◽  
Eddy Simulation ◽  
Curved Duct

Detached Eddy Simulation of Turbulent Flow and Heat Transfer in a Ribbed Duct

2005 ◽  
Vol 127 (5) ◽  
pp. 888-896 ◽  
Author(s):  
Aroon K. Viswanathan ◽  
Danesh K. Tafti
Keyword(s):  
Heat Transfer ◽  
Turbulent Flow ◽  
Flow Direction ◽  
Main Flow ◽  
Detached Eddy Simulation ◽  
Heat Transfer Characteristics ◽  
Eddy Simulation ◽  
Flow And Heat Transfer ◽  
Main Flow Direction ◽  
Key Features

Detached Eddy Simulation (DES) of a hydrodynamic and thermally developed turbulent flow is presented for a stationary duct with square ribs aligned normal to the main flow direction. The rib height to channel hydraulic diameter (e∕Dh) is 0.1, the rib pitch to rib height (P∕e) is 10 and the calculations have been carried out for a bulk Reynolds number of 20,000. DES calculations are carried out on a 963 grid, a 643 grid, and a 483 grid to study the effect of grid resolution. Based on the agreement with earlier LES computations, the 643 grid is observed to be suitable for the DES computation. DES and RANS calculations carried out on the 643 grid are compared to LES calculations on 963∕1283 grids and experimental measurements. The flow and heat transfer characteristics for the DES cases compare well with the LES results and the experiments. The average friction and the augmentation ratios are consistent with experimental results, predicting values within 10% of the measured quantities, at a cost lower than the LES calculations. RANS fails to capture some key features of the flow.

Constrained large-eddy simulation of turbulent flow and heat transfer in a stationary ribbed duct

2016 ◽  
Vol 26 (3/4) ◽  
pp. 1069-1091 ◽  
Author(s):  
Zhou Jiang ◽  
Zuoli Xiao ◽  
Yipeng Shi ◽  
Shiyi Chen
Keyword(s):  
Heat Transfer ◽  
Large Eddy Simulation ◽  
Turbulent Flow ◽  
Thermodynamic Quantities ◽  
Detached Eddy Simulation ◽  
Square Duct ◽  
Content Type ◽  
Eddy Simulation ◽  
Flow And Heat Transfer ◽  
Large Eddy

Purpose – The knowledge about the heat transfer and flow field in the ribbed internal passage is particularly important in industrial and engineering applications. The purpose of this paper is to identify and analyze the performance of the constrained large-eddy simulation (CLES) method in predicting the fully developed turbulent flow and heat transfer in a stationary periodic square duct with two-side ribbed walls. Design/methodology/approach – The rib height-to-duct hydraulic diameter ratio is 0.1 and the rib pitch-to-height ratio is 9. The bulk Reynolds number is set to 30,000, and the bulk Mach number of the flow is chosen as 0.1 in order to keep the flow almost incompressible. The CLES calculated results are thoroughly assessed in comparison with the detached-eddy simulation (DES) and traditional large-eddy simulation (LES) methods in the light of the experimentally measured data. Findings – It is manifested that the CLES approach can predict both aerodynamic and thermodynamic quantities more accurately than the DES and traditional LES methods. Originality/value – This is the first time for the CLES method to be applied to simulation of heat and fluid flow in this widely used geometry.

Detached eddy simulation on the turbulent flow in a stirred tank

AIChE Journal ◽  
2011 ◽  
Vol 58 (10) ◽  
pp. 3224-3241 ◽  
Author(s):  
J. Gimbun ◽  
C. D. Rielly ◽  
Z. K. Nagy ◽  
J. J. Derksen
Keyword(s):  
Turbulent Flow ◽  
Stirred Tank ◽  
Detached Eddy Simulation ◽  
Eddy Simulation

Detached Eddy Simulation of the Turbulent Flow in a Stirred Tank

2011 ◽  
Vol 236-238 ◽  
pp. 1487-1491 ◽  
Author(s):  
Feng Ling Yang ◽  
Shen Jie Zhou ◽  
Gui Chao Wang
Keyword(s):  
Kinetic Energy ◽  
Turbulent Flow ◽  
Computational Cost ◽  
Stirred Tank ◽  
Detached Eddy Simulation ◽  
Mean Velocity ◽  
Eddy Simulation ◽  
Energy Profiles ◽  
Les Model ◽  
Des Model

In the present work, detached eddy simulation (DES) of the turbulent flow in an unbaffled stirred tank agitated by a six-pitched-blade turbine was carried out. The sliding mesh (SM) approach was applied to simulate the rotation of the impeller. For comparison, the computations based on the large eddy simulation (LES) model and RANS equations closed with Reynolds stress model (RSM) were also performed. The instantaneous velocity fluctuations, mean velocity and turbulent kinetic energy profiles were analyzed and compared with the laser doppler velocimetry (LDV) results from literature. Results show that DES model can capture the unsteady turbulent flow characteristics accurately. The mean velocity and turbulent kinetic energy profiles by the DES model are in good agreements with the LES results and the LDV data. Besides, the computational cost of DES is only about 80% of LES. By contrast, the results obtained by RSM are not so good. It can be concluded that the DES model can produce as similarly good predictions as LES with less computational cost, and can work as an alternative of the LES model in predicting the hydrodynamics in the stirred tanks.

scholarly journals DES of the turbulent flow around a circular cylinder of finite height

2016 ◽  
Vol 13 (2) ◽  
pp. 179-188 ◽  
Author(s):  
Aly Hassan Elbatran
Keyword(s):  
Circular Cylinder ◽  
Turbulent Flow ◽  
Turbulence Model ◽  
Model Comparison ◽  
Research Work ◽  
Flow Characteristics ◽  
Numerical Results ◽  
Detached Eddy Simulation ◽  
Eddy Simulation ◽  
Finite Height

The current research work investigates numerically the turbulent flow field characteristics around three dimensional circular cylinder of finite height at Reynolds number of 43000 using Detached Eddy Simulation (DES) turbulence model. Comparison of the numerical results with the experiment data has been taken place. The results reveals that the DES turbulence model is superior for predicting the flow past the circular cylinder of finite height at this Re. The numerical results of this study show the great potential of the presented DES for investigating the complicated flow structure in this case. DES is very accurate for predicting the flow characteristics in many sophisticated cases and can reduce the computational efforts during the simulation process in comparison with Large Eddy Simulation (LES) turbulence mathematical model. 

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