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Showing 1 to 20 of 56 for “"reacting flow"”.
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The numerical solution of reacting flow problems
… for solving mathematical models of reactive flow. Two main issues of concern when solving these problems are large computational costs and numerical instabilities and inaccuracies. Over the past decades, many numerical techniques have been suggested for the solution of reacting flow problems. …
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Predicting Soot Emissions with Advanced Turbulent Reacting Flow Modelling
… of size and shape of soot particles in turbulent reacting flows are required, not only for accurate predictions related to flame characteristics but also to meet increasingly stringent regulations. Over the last decades, advances in the understanding of key processes controlling soot formation and …
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Modeling Three Reacting Flow Systems with Modern Computational Fluid Dynamics
… software packages, and involved predicting the flow, heat transfer, and chemical kinetics. Accuracy was determined by comparison of model predictions and experimental data. Parametric modeling studies were performed in order to better understand converter performance and limitations. Modeling …
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Analysis of diffusion models in high speed reacting flow simulations
… the effect of mass diffusion in a high speed reacting flow field. Diffusion processes have typically been neglected in high speed reacting flows as the time scales associated with convective and reactive processes are found to be much shorter than diffusive time scales. However, diffusion may …
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An error-controlled adaptive chemistry method for reacting flow simulations
… comprehensive reaction model in modeling complex reacting flows. "Adaptive Chemistry" - a method that uses several smaller locally-accurate reduced reaction models rather than a single "catch-all" model - has been shown in the combustion literature to be a viable option for improving computational …
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Collaborative Simulation of Reacting Flow and Controller in Chemical Looping Systems
… to observe and regulate multiphase reactive flows. For the first time, detailed reacting flow patterns and system-level dynamics under active control are demonstrated, addressing critical challenges such as OC circulation, gas and fuel leakage, H2 production, CO2 capture, and low-rank fuel …
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Mean reaction rate closures for nanoparticle formation in turbulent reacting flow
… mean reaction rate closures for turbulent reacting flow. The closures model the mean rate of reaction in the flow and are applied to simulations of nanoparticle formation. The simulations couple detailed chemical reaction, particle population dynamics and turbulent flow, and offer the …
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Multiscale computational simulation of multidimensional chemically reacting flow over washcoated heterogeneous catalysts
This work addresses three distinct but interrelated topics: The simulation and evaluation of a novel ceramic microchannel heat exchanger; the adaptation of in situ adaptive tabulation for the acceleration of transient, heterogeneous chemistry in large CFD models; and the development of catalytic …
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Advancing turbulent reacting flow simulations with generalisable machine learning models for sub-grid FDF
The accurate modelling of turbulent reacting flows remains a significant challenge in computational combustion research, particularly within the large eddy simulation (LES) framework. This study investigates the application of machine learning (ML) techniques for predicting sub-grid filtered …
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Large eddy simulation of a fuel-rich turbulent non-premixed reacting flow with radiative heat transfer
… for the simulation of turbulent non-premixed reacting flow, in particularly for the predictions of soot and NO production, and to investigate the radiative heat transfer during combustion process applying Discrete Ordinates Method (DOM). LES seeks the solution by separating the flow field into …
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Effects of Thermoacoustic Oscillations on Spray Combustion Dynamics with Implications for Lean Direct Injection Systems
… can cause oscillations in combustor through-flows and given the right phase conditions, can also drive unsteady heat release. This coupling has the potential to enhance the amplitude of pressure oscillations. To curb the potential harms caused by the existence of thermoacoustic instabilities, …
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Modeling and Simulation of High-Density Spray Combustion
… accounting for real gas effects in chemically reacting flow. It verifies the need for this complicated solution by comparing the simulations of standard flows with real gas and ideal gas models. The method draws from existing kinetic model resources and the relation of real gas behavior to …
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Numerical Analysis of Flow and Heat Transfer through a Lean Premixed Swirl Stabilized Combustor Nozzle
… well as numerical approaches for several inlet flow conditions under both non-reacting and reacting flows. These studies may be expected to provide valuable insights for the industrial design communities towards identifying thermal hot spot locations as well as in quantifying the heat transfer …
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Effect of Thermally Induced Deformation in a Supersonic Combustion Facility
… the effect of thermal deformation on the reacting flow developing within the University of Virginia (UVa) Supersonic Combustion Facility (SCF). A detailed thermal-structural model is developed to resolve the temperature distribution and the resulting structural deformation taking place …
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Modified source-type flame model and vorticity generated by the flame and bluff bodies
… sheet method and diffuses into the surrounding flow in the form of vortex disks. The freestream turbulence is simulated by injecting vortex disks into an initially uniform freestream. Flame-flow interactions are studied when a thin circular cylinder, a large circular cylinder, and a flat plate …
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Hydroxyl-Radical Planar Laser-Induced Fluorescence Imaging of Turbulent Supersonic Combustion
Flow visualisation and statistical analysis of a supersonic, turbulent reacting flow from non-intrusive hydroxyl radical (OH) planar laser-induced fluorescence (PLIF) images are presented. The OH PLIF images show instantaneous structures of turbulence in two combustor configurations at different …
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Characteristics of flame-turbulence interactions in freely propagating turbulent premixed flames under decaying and forced isotropic turbulence conditions
… analysis focuses on the instantaneous reacting flow field, mean flame structure in both physical and state space, and the transport and dynamics of enstrophy. The results provide quantitative insights into how sustained versus decaying turbulence influences flame topology, small-scale …
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Behaviour of accelerating entropy spots
… conversion are investigated using a model non-reacting flow system (the Entropy Generator Rig, EGR), designed to mimic the behaviour of a combustor in a controlled environment. The contribution of indirect noise can be easily identified and isolated in the acquired pressure traces, allowing the …
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A fast 3D particle method for simulations of buoyant and reacting flows
… of the gradients and the distortion of the flow map. The same tree structure is used to compute all the variables of interest and those required during the integration of the governing equations. Next, we apply our modified interpolation kernel algorithm for treating diffusion and remeshing …
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