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5.13.14 Povitsky

47th NIA CFD Seminar
ADJUSTED FORMULATION OF VORTICITY CONFINEMENT WITH APPLICATIONS TO TIP VORTICES OF STATIONARY AND ROTATING WINGS

Alex Povitsky, University of Akron
May 13, 2014, 11:00 am, NIA, Rm 141
CFD Seminar Video

Abstract:
Computational Fluid Dynamics solvers employ upwind discretization for convective terms and, while this improves numerical stability, it comes at the cost of numerical dissipation causing smearing of the solution at a much greater rate than physical diffusion. Modeling of the generation of vortex and its impingement remain a very computationally intensive task. To improve accuracy of CFD simulations by combating numerical viscosity using moderate-size grids, the vorticity confinement (VC) approach is able to capture tip vortices as they convect downstream through the addition of a centrifugal body force term in the momentum equations. We developed a fully adaptive VC based on local evaluation of the amount of numerical dissipation and on coupling of VC and Total variation Diminishing (TVD) approaches. Applications to helicopter blade tip vortices and to induced drag generated by fixed wing will be discussed.

Speaker Bio:
Dr. Alex Povitsky is an Associate Professor of Mechanical Engineering at the University of Akron, Akron OH from 2003. Prior to it he was a lecturer at the Technion-Israel Institute of Technology (1994-97), Senior Scientist with the Institute of Computer Applications (ICASE) at NASA Langley Research Center (1997-2001), and Associate Professor at Concordia University (Montreal) (2001-2003). He published 50 journal papers in vorticity confinement approach, CFD modeling of micro- and nano- fluidics, development of parallel algorithms for implicit and high-order numerical schemes, modeling of laser ablation and hypersonic ablation, unsteady aerodynamics of micro air vehicles and aero-acoustics of vortex-body interaction. His research has been supported by Canadian NSERC, British Royal Society, Israel Academy of Sciences, NSF, NASA, AFOSR, ARO, US Navy, AFRL, ASEE, industry and the State of Ohio. He is a Senior Member of AIAA. He has been an Air Force Summer Faculty Fellow in 2005-2009, 2011-2012 and 2014.

Additional information, including the webcast link, can be found at the NIA CFD Seminar website, which is temporarily located at http://www.hiroakinishikawa.com/niacfds/index.html.

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