Reconstruction of initial field from experimental data for numerical simulations of realistic aircraft wakes
by O. Labbe, P. Sagaut
Progress in Computational Fluid Dynamics, An International Journal (PCFD), Vol. 3, No. 1, 2003

Abstract: The development of wake vortex behind an A300 Airbus model in high-lift configuration is computed by solving the unsteady Navier-Stokes equations for an incompressible fluid with a second order accurate scheme in time and space. Both two- and three-dimensional simulations are carried out, which allow us to compare the main vortex trajectory with data measured by three-component LDV system in the Onera facility. The study is focused on the way of initialising the computational entrance section based on the experimental data and the consequential effects of main vortex position up to nine wing spans downstream of the model. Several ways to reconstruct the initial velocity field for the simulations are investigated. The circulation distributions around the main vortex are compared and results obtained show that the circulation level is not a pertinent parameter to define a correct initialisation. Numerical results show that a better agreement with experimental data is obtained when a large domain is covered by experiments at the inlet section. A technique to reconstruct adequate initial data solving an inverse problem is also presented.

Online publication date: Wed, 24-Dec-2003

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