Computational fluid dynamics

Joshi, Jyeshtharaj B.; Nandakumar, K.; Patwardhan, Ashwin W.; Nayak, Arun K.; Pareek, Vishnu; Gumulya, Monica; Wu, Chunliang; Minocha, Nitin; Pal, Eshita; Kumar, Mukesh; Bhusare, Vishal; Tiwari, Sudarshan; Lote, Dhiraj A.; Mali, Chaitanya R.; Kulkarni, A.L.; Tamhankar, Sarang

doi:10.1016/b978-0-08-102337-2.00002-x

Cited by 27 publications

(21 citation statements)

References 298 publications

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“…Furthermore, Courant-Friedrich-Levy (CFL) condition is satisfied in resolving the time scale. 64 The time step size is determined using Equation (39) to make it small enough to be consistent with the fine mesh size, where Δt, CFL, Δx, and U represent the time step, CFL number, minimum grid size, and the velocity, respectively.…”

Section: Meshing and Model Validationmentioning

confidence: 99%

“…The numerical case is prepared in such a way that the computational domain is large enough to accommodate the large eddies of interest. Furthermore, Courant–Friedrich–Levy (CFL) condition is satisfied in resolving the time scale 64 . The time step size is determined using Equation () to make it small enough to be consistent with the fine mesh size, where

italicΔt

italicCFL

italicΔx

, and

U

represent the time step, CFL number, minimum grid size, and the velocity, respectively.

italicΔt goodbreak= \frac{italicCFL * italicΔx}{U}

…”

Section: Meshing and Model Validationmentioning

confidence: 99%

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Analysis of methane, propane, and syngas oxy‐flames in a fuel‐flex gas turbine combustor for carbon capture

Haque

Nemitallah

Abdelhafez

et al. 2022

Intl J of Energy Research

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Premixed oxy-combustion flames of methane, syngas (CH 4 :CO:H 2 with the molar ratio of 2:1:1), and propane in CO 2 -diluted environment (for carbon capture) are examined in a swirl-stabilized combustor using large eddy simulations (LES) in three-dimensional (3-D) domain. The flame and emission characteristics are examined for the different fuels over a range of equivalence ratios (Φ: 0.34, 0.39, and 0.42), at 60% oxygen fraction (OF), and 2.5 m/s bulk inlet velocity under atmospheric conditions. The results indicate increments in several characteristic parameters that are of special importance for gas turbine combustion applications, including adiabatic flame temperature (T ad ), laminar flame speed (LFS), power density (PD), product formation rate (PFR), Damköhler number (Da), and CO emission, with the increase of Φ whatever the type of fuel. Alternatively, flame thickness (δ) decreases with the increase in Φ for the three fuels. Characteristic "V" shape with almost identical outer recirculation zone (ORZ) is also observed for the three fuels. Among the studied fuels, oxy-methane flames demonstrate highest flame thicknesses, least uniform temperature distribution (highest pattern factor) at combustor outlet, and lowest CO emission level. Oxy-syngas flames show more uniform temperature distribution (lowest pattern factor) at combustor outlet and highest CO emission as compared with the oxy-methane and oxy-propane flames. The oxy-propane flames have higher values of T ad , LFS, PD, PFR, Da, and thermal power (TP) along with lowest flame thickness compared with methane and syngas counterparts. Highlights• Increasing equivalence ratio improves the flame characteristics but increases CO emission.• Fuel type has insignificant effects on shape/size of the outer recirculation zone (ORZ).• Oxy-methane flames showed highest flame thicknesses and pattern factor and lowest CO.

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Section: Meshing and Model Validationmentioning

confidence: 99%

italicΔt

italicCFL

italicΔx

, and

U

represent the time step, CFL number, minimum grid size, and the velocity, respectively.

italicΔt goodbreak= \frac{italicCFL * italicΔx}{U}

…”

Section: Meshing and Model Validationmentioning

confidence: 99%

Analysis of methane, propane, and syngas oxy‐flames in a fuel‐flex gas turbine combustor for carbon capture

Haque

Nemitallah

Abdelhafez

et al. 2022

Intl J of Energy Research

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“…at numerous node points of the mesh. With appropriate boundary conditions, it is possible to solve these equations iteratively for the flow field variables at each computational point …”

Section: Mathematical Modelsmentioning

confidence: 99%

Computational Fluid Dynamics Study of Biomass Cook Stove—Part 1: Hydrodynamics and Homogeneous Combustion

Husain

Tiwari

Pandit

et al. 2019

Ind. Eng. Chem. Res.

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In this work, a computational fluid dynamics (CFD)-assisted optimization study has been carried out, implementing geometric design modifications in a biomass cook stove (BCS) to achieve uniform air–fuel distribution. The work has been divided into two parts. The first part deals with the numerical investigations of fluid phase hydrodynamics and air–fuel homogeneous phase combustion. Simulations have been performed for a wide range of air velocities to predict the roles of primary and secondary airflow in improving the spatial airflow uniformity inside the BCS. The homogeneous combustion simulations show linear dependence of power and temperature on the air velocity and air-to-fuel ratio. The results indicate that the most optimized power output and temperature values are achieved when the grate is placed at a height of 25 mm, and the orifice plate with 15 holes of 10 mm each is located at a height of 105 mm from the bottom of the cook stove.

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“…The governing equations listed above are solved using Fluent 18.0 with a finite volume code with the steady-state approximation. The SIMPLE (semi-implicit pressure linked equation) algorithm is adopted for pressure–velocity coupling . The second-order upwind scheme has been adopted for discretization.…”

Section: Cfd Modelingmentioning

confidence: 99%

Thermal-Hydraulic Performance of an Annular Pipe with Square Wire Coil Inserts Using Computational Fluid Dynamics

Hinge

Patwardhan

2019

Ind. Eng. Chem. Res.

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The development of high-thermal-performance heat exchangers is a demand of the recent era for efficient utilization of energy sources. The present work deals with the computational fluid dynamics (CFD) analysis of flow and heat transfer in an annular pipe with square wire coil inserts in the turbulent flow regime (10500 ⩽ Re ⩽ 35000). A good agreement was observed for the predicted profiles of axial velocity, radial velocity, and turbulent kinetic energy using CFD and particle image velocimetry data. The effect of wire thickness and pitch and Reynolds number (Re) on vortices has been presented using the Q-criterion. The rise in friction factor and Nusselt number with inserts was observed to be 2.22 and 1.41 times higher than that in the plain annular tube. The thermal performance factor was >1 for Re < 15000 indicating that the square wire coil inserts can be used effectively for heat transfer augmentation without pumping power losses.

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Computational fluid dynamics

Cited by 27 publications

References 298 publications

Analysis of methane, propane, and syngas oxy‐flames in a fuel‐flex gas turbine combustor for carbon capture

Analysis of methane, propane, and syngas oxy‐flames in a fuel‐flex gas turbine combustor for carbon capture

Computational Fluid Dynamics Study of Biomass Cook Stove—Part 1: Hydrodynamics and Homogeneous Combustion

Thermal-Hydraulic Performance of an Annular Pipe with Square Wire Coil Inserts Using Computational Fluid Dynamics

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