Large-Eddy Simulation of Reacting Turbulent Flows in Complex Geometries

2005 ◽  
Vol 73 (3) ◽  
pp. 374-381 ◽  
Author(s):  
K. Mahesh ◽  
G. Constantinescu ◽  
S. Apte ◽  
G. Iaccarino ◽  
F. Ham ◽  
...  
Keyword(s):  
Large Eddy Simulation ◽  
Gas Turbine ◽  
Turbulent Flows ◽  
Reacting Flows ◽  
Gas Turbine Combustor ◽  
Turbine Engine ◽  
Progress Variable ◽  
Eddy Simulation ◽  
Variable Approach ◽  
Large Eddy

Large-eddy simulation (LES) has traditionally been restricted to fairly simple geometries. This paper discusses LES of reacting flows in geometries as complex as commercial gas turbine engine combustors. The incompressible algorithm developed by Mahesh et al. (J. Comput. Phys., 2004, 197, 215–240) is extended to the zero Mach number equations with heat release. Chemical reactions are modeled using the flamelet/progress variable approach of Pierce and Moin (J. Fluid Mech., 2004, 504, 73–97). The simulations are validated against experiment for methane-air combustion in a coaxial geometry, and jet-A surrogate/air combustion in a gas-turbine combustor geometry.

scholarly journals Large-Eddy Simulation of Reacting Flows in Industrial Gas Turbine Combustor

2018 ◽  
Vol 34 (5) ◽  
pp. 1269-1284 ◽  
Author(s):  
I. Langella ◽  
Z. X. Chen ◽  
N. Swaminathan ◽  
S. K. Sadasivuni
Keyword(s):  
Large Eddy Simulation ◽  
Gas Turbine ◽  
Reacting Flows ◽  
Gas Turbine Combustor ◽  
Eddy Simulation ◽  
Large Eddy ◽  
Industrial Gas Turbine

Simulating Turbulent Flows in Complex Geometries

2003 ◽  
Author(s):  
Krishnan Mahesh ◽  
George Constantinescu ◽  
Parviz Moin
Keyword(s):  
Gas Turbine ◽  
Turbulent Flows ◽  
Complex Geometry ◽  
Reynolds Numbers ◽  
Complex Geometries ◽  
Gas Turbine Combustor ◽  
Turbine Engine ◽  
Eddy Simulation ◽  
Large Eddy ◽  
High Reynolds

We discuss development of a numerical algorithm, and solver capable of performing large-eddy simulation (LES) in geometries as complex as the combustor of a gas-turbine engine. The algorithm is developed for unstructured grids, is non-dissipative, yet robust at high Reynolds numbers on highly skewed grids. Results from validation in simple geometries is shown along with simulation results in the exceedingly complex geometry of a Pratt & Whitney gas turbine combustor.

Large Eddy Simulation of Turbulent Combustion Flow in a Gas-Turbine Combustor

2003 ◽  
Author(s):  
Nobuyuki Taniguchi ◽  
Takuji Tominaga ◽  
Akiyoshi Hashimoto ◽  
Yuichi Itoh
Keyword(s):  
Large Eddy Simulation ◽  
Gas Turbine ◽  
Turbulent Flows ◽  
Aircraft Engine ◽  
Gas Turbine Combustor ◽  
Eddy Simulation ◽  
Large Eddy ◽  
Combustion Flow ◽  
Energy Equipment ◽  
Primary Problem

In views of mechanical engineering, a primary problem in energy equipment design is to control of turbulent flows. Large eddy simulation is applied for analyzing tree-dimensional and unsteady features in gas-turbine combustor. For these purpose, LES with a G-equation flame model based on the flamelet concept is developed on the general co-ordinate grid and is demonstrated in design of a premixed gas-turbine combustor for aircraft engine. The simulations of the flame propagation are executed in some conditions with different relations of the equivalent ratios, and the flame positions and propagating behaviors are analyzed.

Large Eddy Simulation of Turbulent Combustion Flows in Gas Turbine Combustor

2002 ◽  
Author(s):  
Takuji Tominaga ◽  
Nobuyuki Taniguchi ◽  
Yuichi Itoh ◽  
Toshio Kobayashi
Keyword(s):  
Large Eddy Simulation ◽  
Gas Turbine ◽  
Turbulent Combustion ◽  
Equivalence Ratio ◽  
Equation Model ◽  
Gas Turbine Combustor ◽  
Turbine Engine ◽  
Eddy Simulation ◽  
Large Eddy ◽  
Annular Combustor

In this paper, Large Eddy Simulation (LES) and G-equation model based on flamelet concept are demonstrated in axially staged annular combustor of gas turbine engine. G-equation model is extended for combustion in a non-uniform equivalence ratio of premixed gas. Using this model, the simulations of the flame propagation are executed with different spatial distribution of the equivalence ratios. In order to compare the results, experiments for combustion and non-combustion flows in the modeled combustor are also performed. The flow field can be predicted by LES and be agreed with the experimental results essentially. The flame propagating behaviors depending on the equivalence ratios are represented by the extended G-equation model.

Large eddy simulation with flamelet progress variable approach combined with artificial neural network acceleration

2021 ◽  
Author(s):  
Lorenzo Angelilli ◽  
Pietro Paolo Ciottoli ◽  
Riccardo Malpica Galassi ◽  
Francisco E. Hernandez Perez ◽  
Mattia Soldan ◽  
...  
Keyword(s):  
Neural Network ◽  
Artificial Neural Network ◽  
Large Eddy Simulation ◽  
Progress Variable ◽  
Eddy Simulation ◽  
Variable Approach ◽  
Large Eddy ◽  
Artificial Neural

An Assessment of the Implicit Non-Iterative PISO Solution Procedure for the Prediction of Combustor Performance

2019 ◽  
Author(s):  
Megan Karalus ◽  
Niveditha Krishnamoorthy ◽  
Bob Reynolds ◽  
George Mallouppas
Keyword(s):  
Large Eddy Simulation ◽  
Gas Turbine ◽  
Solution Procedure ◽  
Reacting Flows ◽  
Small Time ◽  
Accurate Prediction ◽  
Simple Method ◽  
Performance Improvements ◽  
Eddy Simulation ◽  
Large Eddy

Abstract Large Eddy Simulation (LES) of gas turbine combustors has gained traction as a key tool in the design process. Accurate prediction of the multiphysics of reacting flows — evaporating fuel spray, turbulent mixing, turbulent chemistry interaction, radiation, and conjugate heat transfer to name a few — is key to the accurate prediction of combustor performance. The overall solution time for a standard LES simulation on an industrial system can be burdensome because of the small time and length scales required to capture the aforementioned multiphysics to an acceptable level. Any performance improvements are therefore welcomed. In this paper, we compare the implicit non-iterative PISO solution procedure with the implicit iterative SIMPLE method for the Large Eddy Simulation of a Honeywell combustor using the commercial software, Simcenter STAR-CCM+ v13.04. Time averaged simulation results are validated against rig data. Results show that the PISO solution method provides results which are similar to those found using the SIMPLE method, and accurate when compared to rig data, but at up to a 3.4X speed-up for this liquid fueled gas turbine combustor.

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