Characterization of liners using a lattice-boltzmann solver
Pranav Manjunath (TU Delft - Wind Energy)
Francesco Avallone (TU Delft - Wind Energy)
Damiano Casalino (TU Delft - Wind Energy)
Daniele Ragni (TU Delft - Wind Energy)
Mirjam Snellen (TU Delft - Aircraft Noise and Climate Effects)
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Abstract
Acoustic liners are widely used as noise suppression devices, for example in aircraft engines. The effectiveness of the liners is measured through the impedance. In the present study, using a lattice-Boltzmann solver, the response of two liner geometries to grazing acoustic waves is examined. The two geometries have porosity equal to 0.99% and 6.89%, respectively. Impedance is computed using the traditional in-situ method. The results from the simulation are validated against previous experimental data, DNS data and predictions from semi-empirical models. Results show agreement with these reference data, allowing to use the computational setup for further analysis with a realistic liner configuration in the presence of a grazing flow.