Simulation of closed spaces' flow field using different turbulent models

Three turbulent models, standard k- model, realizable k- model and SST k- model, are proposed to calculate the distribution of the flow field in a novel static circulating jet mixer. The results show that the SST k-model can depict truly the fluid motion in the novel jet mixer from the velocity vector distribution. The k-Standard model overestimates k in the wall and the bulk zones. Comparing the numerical models, the SST k- model gives better results than the other k-models at the same Reynold number.

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The Influence of Different Turbulence Models on the FlowField Characteristics of an Aerospike Nozzle

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.110-116.437 ◽

2011 ◽

Vol 110-116 ◽

pp. 437-443

Author(s):

S. Noori ◽

A. Shahrokhi

Keyword(s):

Flow Field ◽

Stokes Equations ◽

Initial Conditions ◽

Turbulence Models ◽

State Density ◽

Navier Stokes ◽

Field Equations ◽

Solution Convergence ◽

Turbulent Models ◽

Aerospike Nozzle

To improve the calculation of the flow properties of an aerospike nozzle, different turbulent models are studied in this research. The primary shape of the nozzle and the plug is determined through utilizing an approximate method. The flow field is then simulated using Navier-Stokes equations for compressible flow. The computational methodology utilizes steady state density-based formulation and a finite volume cell centered scheme to discretize the flow field equations. To accelerate the solution convergence, the flow field is divided into several zones. Each zone is facilitated with proper unstructured grid and appropriate initial conditions are implemented to each zone. The accuracy and the robustness of wall function based turbulence models i.e. standard and RNG k-ε models are compared with those of Spalart-Allmaras (S-A) and k-ω turbulence models.

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Analysis of Flow Field in Vertical Roller Mill Chamber Based on Turbulent Models

2009 International Conference on Environmental Science and Information Application Technology ◽

10.1109/esiat.2009.162 ◽

2009 ◽

Cited By ~ 1

Author(s):

Yewang Sun ◽

Xiangbo Ze ◽

Xuefeng Yang ◽

Chaoyang Zhang ◽

Yiqi Zhou

Keyword(s):

Flow Field ◽

Roller Mill ◽

Turbulent Models ◽

Vertical Roller

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Investigation of Turbulent Models for the Flow Field From a Typical Strut-Based Scramjet Combustor

Volume 2: Combustion, Fuels and Emissions, Parts A and B ◽

10.1115/gt2011-45078 ◽

2011 ◽

Cited By ~ 1

Author(s):

Shi-bin Luo ◽

Wei Huang ◽

Hui Qin ◽

Zhen-guo Wang ◽

Jun Liu ◽

...

Keyword(s):

Experimental Data ◽

Flow Field ◽

Shear Layer ◽

Flow Fields ◽

Numerical Results ◽

Reflected Shock Wave ◽

Small Scale ◽

Reacting Flow ◽

Scramjet Combustor ◽

Turbulent Models

The two-dimensional coupled implicit RANS equations and three turbulent models have been employed to numerically simulate the nonreacting and reacting flow fields of a typical strut-based scramjet combustor, and the numerical results have been compared with the experimental data. At the same time, three different grid scales have been used to test the grid independence in the numerical simulations, namely the small scale (81,590 nodes), the moderate scale (98,510 nodes) and the large scale (147,470 nodes). The obtained results show that the RNG k-ε model is more suitable to numerically simulate the flow field in the scramjet combustor than the realizable k-ε model and the SST k-ω model, and the numerical results obtained by the moderate and large grid scales show reasonably better agreement with the experimental data. The quasi-diamond wave system is formed in both the nonreacting and reacting flow fields. In the reacting flow field, there are two clear strong shear layers generated between the fuel injection and the supersonic freestream, and at the intersection point between the shear layer and the reflected shock wave, the reaction zone is broader than anywhere else. In the corner formed between the upper surface of the strut and the shear layer, an expansion wave is clearly generated, and another also exists in the symmetrical corner.

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Detailed measurements of the flow field in vaneless and vaned diffusers of centrifugal compressors

Journal de Physique III ◽

10.1051/jp3:1992213 ◽

1992 ◽

Vol 2 (9) ◽

pp. 1787-1804 ◽

Cited By ~ 2

Author(s):

Christian Fradin

Keyword(s):

Flow Field ◽

Centrifugal Compressors

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Numerical Study of the Combined Free-Forced Convection and Mass Transfer Flow Past a Vertical Porous Plate in a Porous Medium with Heat Generation and Thermal Diffusion

Nonlinear Analysis Modelling and Control ◽

10.15388/na.2006.11.4.14737 ◽

2006 ◽

Vol 11 (4) ◽

pp. 331-343 ◽

Cited By ~ 19

Author(s):

M. S. Alam ◽

M. M. Rahman ◽

M. A. Samad

Keyword(s):

Mass Transfer ◽

Flow Field ◽

Differential Equations ◽

Forced Convection ◽

Heat Generation ◽

Numerical Study ◽

Porous Plate ◽

Integration Scheme ◽

Suction Parameter ◽

Transfer Flow

The problem of combined free-forced convection and mass transfer flow over a vertical porous flat plate, in presence of heat generation and thermaldiffusion, is studied numerically. The non-linear partial differential equations and their boundary conditions, describing the problem under consideration, are transformed into a system of ordinary differential equations by using usual similarity transformations. This system is solved numerically by applying Nachtsheim-Swigert shooting iteration technique together with Runge-Kutta sixth order integration scheme. The effects of suction parameter, heat generation parameter and Soret number are examined on the flow field of a hydrogen-air mixture as a non-chemical reacting fluid pair. The analysis of the obtained results showed that the flow field is significantly influenced by these parameters.

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