Recent Progress in Comprehensive Modeling of Gas Turbine Combustion

Large Eddy Simulation and Reynolds-Averaged Navier–Stokes modeling of flow in a realistic pharyngeal airway model: An investigation of obstructive sleep apnea

“…Based on a time averaging of the flow field, the RANS approach with appropriate turbulence models is the simplest, but its accuracy in predicting flows that involve separation bubbles, stagnation points, anisotropy or high streamline curvature is inadequate (Wilcox, 1993). Additionally, as it was shown here as well as in other studies the differences between the solutions obtained with different turbulence models within the RANS framework may be very large (Mongia, 2008). In fact, the choice of the most adequate RANS turbulence model depends on the different flow conditions and one needs experimental data or LES results to select the proper model.…”

“…An additional LES advantage over the computationally simpler RANS formulation is the increased level of detail and accuracy it can deliver for unsteady, separated or vortical turbulent flows, LES being able to resolve the evolution of turbulent flow structures and to predict the flow dynamics. A large number of engineering-related problems (Mahesh et al, 2004;Tokyay and Constantinescu, 2006;Boudier et al, 2007;Mongia, 2008) and a few biomedical flow studies showed good agreement of LES data with experimental measurements in contrast with RANS results (Luo et al, 2004;Matida et al, 2006;Jin et al, 2007;Varghese et al, 2008). Therefore, this more accurate numerical technique for flows in a complex geometry, such as the upper airway, was employed here and compared with two typical steady RANS formulations.…”

Modelling of instabilities in turbulent swirling flames

“…and the rise in large scale computing resources has permitted the simulations of flows encountered in realistic swirl stabilised combustion systems [5][6][7][8]. Also, advanced state-of-art numerical techniques with sophisticated algorithms provide a more efficient and effective design tool for swirl based combustion systems, which reduces the larger cost associated with expensive experimental testing.…”

A review of recent developments in carbon capture utilizing oxy-fuel combustion in conventional and ion transport membrane systems

“…Mohanraj et al [58] provided simulations of swirl stabilized liquid fuel model gas turbine combustion system. Mongia [61] presented progress in comprehensive modeling of gas turbine combustion. Computational Combustion Dynamics (CCD) codes were developed to construct empirical/analytical design methodology for low-emission combustion systems.…”