Author Visonneau, M. and Guilmineau, E. and Toxopeus, S.L.
Title Incompressible flow calculations of blunt leading edge separation for a 53 degree swept diamond wing
Conference/Journal 53rd AIAA Aerospace Sciences Meeting (SciTech), Kissimmee, Florida
Month January
Year 2015

Abstract
One of the challenges in prediction of aerodynamic flows is the accurate prediction of onset and progression of separation. In earlier STO research, it was found that different predictions for three-dimensional airfoils at angle of attack showed different pitch moments due to differences in the predicted location of separation areas. Therefore, a diamond shaped wing has been developed within the NATO STO AVT-183 research group, to isolate the blunt leading edge separation. In the present paper, two viscous-flow solvers dedicated to hydrodynamic applications are used to predict the flow around the diamond wing. Both codes solve the incompressible flow using unstructured grids and finite volume discretisation. The results comprise different grid set-ups, with/without peniche and different turbulence models ranging from isotropic or anisotropic statistical turbulence closures to hybrid LES turbulence models. Moreover, the role played by the discretisation error is assessed by using anisotropic automatic grid refinement procedures based on flow-related criteria. A detailed discussion is made, highlighting the similarities and differences of the results, the respective influence of modelling and discretisation errors and showing the potential of CFD tools to predict the type of flow under consideration.

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