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High fidelity simulation of complex turbulent flame is still challenging from many aspects. The present study aims to make the progress from two aspects. The first one is the turbulence modeling, which is achieved by using the newly developed VLES (Very-Large Eddy Simulation) method. The VLES method is a self-adaptive turbulence modeling method which can resolve the turbulence based on the local mesh resolution and the local turbulence scale information. It evolves smoothly from RANS to DNS with the increase of the mesh resolution. It thus can provide accurate predictions on relatively coarse meshes. The second one is the combustion modeling, which is done by combining the FGM (Flamelet Generated Manifold) method. FGM method is an efficient chemistry reduction technique, which has attracted attentions for the successful applications to various complex combustion systems. The present study thus makes the effort to combine the VLES and FGM methods to model complex turbulent flames. Two test cases are selected, i.e. the classical Sandia D flame and the swirling premixed flame from a single GE LM6000 combustor. The numerical results are compared with available experiments. It is found that the VLES-FGM method can be successfully applied for the high fidelity simulation of the complex test flames. The VLES method has high potentials for turbulent flame simulations. INTRODUCTION High fidelity simulation of turbulent combustion is a hot research topic for decades. However, due to the complex interactions of turbulence and combustion in the process, it is not easy to obtain the accurate predictions of turbulent combustion. Large eddy simulation of turbulent combustion has been applied successfully and shown the potentials for high fidelity simulation (Rochette et al., 2018). However, the huge computational cost makes it very difficult to apply LES for wide application of turbulent combustion. There are several methods which have been proposed to reduce the huge computational cost of LES for combustion problem. In the aspect of turbulence modelling, unified turbulence modelling has developed rapidly in recent years. The unified turbulence modelling means that the turbulence is modelled based on the local gird resolution and the local turbulence scales, which can make the turbulence modelling process to evolve smoothly from RANS, LES to DNS. Thus, the coarse mesh can be used for high Reynolds number turbulent flow and also the accuracy can be maintained. In recent years, VLES (Very-Large Eddy Simulation) (Han and Krajnovic, 2013; Han and Krajnovic, 2015) has been found to be an efficient modelling approach for complex turbulent flow simulations. It has been validated in many classical turbulent flows. However, VLES method for turbulent combustion problem is few studied. It is thus quite straightforward to extend the high potential VLES modelling method for complex turbulent combustion simulations. It is supposed that the VLES based turbulent combustion simulation can use coarse mesh to obtain accurate predictions. However, the validation is quite few in previous literatures. It is thus the first goal for the present study, i.e. apply VLES for turbulent combustion simulation.

Very-Large Eddy Simulation of Complex Turbulent Flame Based on FGM