Heat Transfer Effects on a Fully Premixed Methane Impinging Flame

Abstract

A numerical assessment of different thermal conditions for an impinging flame configuration is investigated using large-eddy simulation. The cases of study correspond to a turbulent methane flame at equivalence ratio ER=0.8 and temperature T=298K exiting at 30 m/s with a nozzle-to-plate distance over diameter of H/D = 2. Computational cases based on different thermal conditions are compared to a conjugate case, in which fluid and solid domains are solved simultaneously. A solid material defined with enhanced conductivity properties is used to represent the wall in the conjugate case, so that the characteristic time scales of the solid are reduced. The results indicate that the heat transfer condition influences not only the mean temperature and gradients, but also the temperature fluctuations in the near-wall region. It is found that adiabatic, isothermal and more sophisticated Robin-type boundary conditions contribute to underpredict/overpredict the temperature field near the wall. As the time scales of fluid and solid are of the same order, the use of conjugate approaches is required to predict the correct flow fields near the wall and the skin temperature.

Large eddy simulation of impinging flames: Unsteady ignition and flame propagation

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Fluid-structure interaction analysis of eccentricity and leaflet rigidity on thrombosis biomarkers in bioprosthetic aortic valve replacements

“…The present FSI model is implemented in Alya , BSC’s in-house multi-physics simulation software designed to run efficiently on supercomputers, exhaustively verified, validated, optimized and proved to give accurate solutions in complex fluid and solid mechanics problems, among other physics [51, 51, 52, 53, 54, 55, 45, 56]. Alya has been developed to scale efficiently in parallel on CPUs and/or GPUs using hybrid MPI, OpenMP, CUDA and/or…”

On the formation of Taylor-Görtler structures in the vortex induced vibration phenomenon

“…A low-dissipation finite-element method (FEM) implemented in the code Alya (Lehmkuhl et al, 2019). Alya (Vázquez et al, 2016) is a high performance computing multi-physics code extensively tested and proved to give accurate solutions in complex fluid mechanics problems (Mira et al, 2016;Calmet et al, 2016;Gövert et al, 2017;Rodriguez et al, 2019). For the convective term, a conservative Galerkin scheme proposed by Charnyi et al (2017), which preserves linear and angular momentum and kinetic energy at discrete level is used.…”