Benchmarking a lattice-Boltzmann solver for reactive flows: Is the method worth the effort for combustion?
TL;DR: In this paper, a lattice-Boltzmann approach was used for high-fidelity combustion simulations using low-Mach solvers, which was validated by the Taylor-Green vortex benchmark.
Abstract: This Letter reports a validation of a lattice-Boltzmann approach following the Taylor–Green Vortex benchmark presented at the 19th International Congress on Numerical Combustion and recently reported by Abdelsamie et al. [“The Taylor–Green vortex as a benchmark for high-fidelity combustion simulations using low-Mach solvers,” Comput. Fluids 223, 104935 (2021)]. The lattice-Boltzmann approach, despite having a time step bound by an acoustic Courant–Friedrichs–Lewy condition, provides results faster than the low-Mach solvers which performed to the benchmark. Such a feat is made possible by the fully explicit nature of the method and indicates very high potential for practical applications.
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TL;DR: In this paper, a hybrid recursive regularized pressure based lattice Boltzmann method (HRR-P LBM) is assessed for the simulation of complex transonic flows, where Mass and momentum conservation equations are resolved through a classical LBM solver coupled with a finite volume resolution of entropy equation for a complete compressible solver preserving stability, accuracy, and computational costs.
Abstract: A D3Q19 hybrid recursive regularized pressure based lattice-Boltzmann method (HRR-P LBM) is assessed for the simulation of complex transonic flows. Mass and momentum conservation equations are resolved through a classical LBM solver coupled with a finite volume resolution of entropy equation for a complete compressible solver preserving stability, accuracy, and computational costs. An efficient treatment for wall and open boundaries is coupled with a grid refinement technique and extended to the HRR-P LBM in the scope of compressible aerodynamics. A Vreman subgrid turbulence model and an improved coupling of immersed boundary method with turbulence wall model on Cartesian grid accounts for unresolved scales by large-eddy simulation. The validity of the present method for transonic applications is investigated through various test cases with increasing complexity starting from an inviscid flow over a 10% bump and ending with a turbulent flow over a ONERA M6 three-dimensional wing.
12 citations
TL;DR: In this paper , a Lattice-Boltzmann numerical simulation of thermo-acoustic instabilities of premixed flames is presented, where flames interacting with an imposed acoustic field where flames submitted to a parametric instability can be observed.
5 citations
TL;DR: In this article , the authors investigated the effect of barrier temperature on hybrid nanofluid MHD mixed convection via LBM and found that the barrier temperature can reduce the share of heat transfer in entropy production up to 14% by changing the blocking temperature from 1 to zero.
Abstract: The aim of this study is to investigate the effect of barrier temperature on hybrid nanofluid MHD mixed convection via LBM. The shape of the evaluated chamber is trapezoidal, subjected to heat absorption or heat generation. Reducing the share of heat transfer in entropy production up to about 14% is possible by changing the blocking temperature from 1 to zero. By increasing the effect of buoyancy forces, a stronger convection current is formed inside the chamber. When the magnetic field is applied, it reduces the fluid flow speed and temperature gradient. This factor leads to the reduction of convection effects and the weakening of buoyancy forces. So, the stronger the convection, the more obvious this effect. The flow under the influence of heat production results in the lowest mean Nusselt value. The higher heat absorption or heat generation coefficients, lead to a more effective magnetic field application. If the number of Richardson is low, heat absorption or heat generation effects are more obvious. Bejan Number, for the coefficient of heat absorption or heat generation, equals +5 (Q=+5), which is about 10% & 18% higher than Q=0 and Q=-5, respectively.
4 citations
3 citations
TL;DR: In this paper , a model based on a passive scalar variable is presented to predict hydrogen auto-ignition events in a vitiated co-flow with a 3D H2/N2 Cabra flame.
2 citations
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TL;DR: An overview of the lattice Boltzmann method, a parallel and efficient algorithm for simulating single-phase and multiphase fluid flows and for incorporating additional physical complexities, is presented.
Abstract: We present an overview of the lattice Boltzmann method (LBM), a parallel and efficient algorithm for simulating single-phase and multiphase fluid flows and for incorporating additional physical complexities. The LBM is especially useful for modeling complicated boundary conditions and multiphase interfaces. Recent extensions of this method are described, including simulations of fluid turbulence, suspension flows, and reaction diffusion systems.
6,565 citations
01 Nov 1998
TL;DR: In this article, a new lattice Boltzmann scheme was proposed for simulation of multiphase flow in the nearly incompressible limit. But this scheme is based on distribution functions.
Abstract: In this paper, we propose a new lattice Boltzmann scheme for simulation of multiphase flow in the nearly incompressible limit. The new scheme simulates fluid flows based on distribution functions. The interfacial dynamics, such as phase segregation and surface tension, are modeled by incorporating molecular interactions. The lattice Boltzmann equations are derived from the continuous Boltzmann equation with appropriate approximations suitable for incompressible flow. The numerical stability is improved by reducing the effect of numerical errors in calculation of molecular interactions. An index function is used to track interfaces between different phases. Simulations of the two-dimensional Rayleigh?Taylor instability yield satisfactory results. The interface thickness is maintained at 3?4 grid spacings throughout simulations without artificial reconstruction steps.
779 citations
TL;DR: It is found that the lattice Boltzmann method is less dissipative than high order schemes and less dispersive than a second order scheme in space with a 3-step Runge-Kutta scheme in time.
290 citations
TL;DR: In this article, a relatively small detailed mechanism has been developed for the combustion of various fuels, mainly hydrocarbons, in air or oxygen-inert mixtures, which has been tested previously for autoignition, premixed-flame burning velocities, and structures and extinction of diffusion flames and of partially premixed flames.
287 citations
TL;DR: An extended lattice Boltzmann (BGK) model is presented for the simulation of low Mach number flows with significant density changes and with a boundary fitting formulation and local grid refinement the scheme enables accurate and efficient computations of lowMach number reactive flows in complex geometry on the simplest Cartesian grids.
151 citations