PARALLEL AND DYNAMIC MESH ADAPTATION OF TETRAHEDRAL-BASED MESHES FOR PROPAGATING FRONTS AND INTERFACES: APPLICATION TO PREMIXED COMBUSTION
Résumé
To reduce CO2 emissions and specific consumption, aeronautical engine manufacturers have to increase the Overall Pressure Ratio (OPR) of the turbines. This OPR increase leads to an direct increase NOx emissions. Lean-premixed combustion is an appealing technology to mitigate this effect. The modeling of lean-premixed flames in industrial combustors is very challenging as combustion takes place at very small scales. In this context, parallel mesh adaptation as proposed by Benard et al. [1] based on the MMG library [2, 3, 4] is an enabling technology, which has the potential to reduce dramatically the cost of flame front capturing simulations in an industrial context. The application case proposed in the present paper is a lean-premixed semi-industrial burner named PREC-CINSTA. This burner has already been used as a benchmark case in many studies. Here, static and dynamic mesh simulations are performed and compared to demonstrate that the flow dynamics in the simulations are mainly dependent to the flame front resolution. Thus, the dynamic mesh simulations enable to get the same results as significantly heavier and more costly static grid simulations.
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