THESE de DOCTORAT - cerfacs

64 Chapter 4: Validation of the acoustic code AVSP-f
a) Modulus of Pressure | ˆp| b) Argument of pressure arg( ˆp)
Figure 4.8: Outputs of AVSP-f. Three monopoles out of phase
Figure 4.9: Acoustic field produced by three monopoles out of phase. p ′ = | ˆp| cos(arg( ˆp))
4.2 The 2D premixed laminar flame
For a second validation of AVSP-f, a two dimensional burner has been chosen. There are three
main concerns in the present validation: first, the computation of the flame dynamics through
an unsteady CFD method ; second, the post-processing of the CFD results to evaluate the
sources of noise; and last but not the least, the consideration of reflecting boundaries (walls,
inlet and outlet) in the acoustic code AVSP-f.
The burner, which is based on the LeHelley’s burner configuration [33], consists of two coaxial
rectangular ducts of different height attached to each other by one of the extremes. The smaller
duct acts as the intake whereas the bigger one plays the role of the combustion chamber. The