NDLI: An Interactive Boundary Layer Modeling Methodology for Aerodynamic Flows

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An Interactive Boundary Layer Modeling Methodology for Aerodynamic Flows

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	Smith, Lelanie Josua, P. Meyer Oliver, F. Oxtoby Arnuad, G. Malan
Copyright Year	2011
Abstract	Computational Fluid Dynamics (CFD) simulation is a computational tool for exploring flow applications in science and technology. Of central importance in many flow scenarios is the accurate modeling of the boundary layer phenomenon. This is particularly true in the aerospace industry, where it is central to the prediction of drag. Modern CFD codes as applied to modeling aerodynamic flows have to be fast and efficient in order to model complex realistic geometries. When considering viscous flows the boundary layer typically requires the largest part of computational resources. To simulate boundary layer flow with most current CFD codes requires extremely fine mesh spacing normal to the wall and is consequently computationally very expensive. Boundary layer modeling approaches have by contrast received relatively little attention, while having the potential of offering considerable computational cost savings. One boundary layer method which has proven to be very accurate is the two-integral method of Drela (1986). Coupling the boundary layer solution to inviscid external flow is, however, a challenge due to the Goldstein singularity, which occurs as separation is approached. We propose to develop a new method to couple Drela’s two-integral equations with a generic outer flow solver in an iterative fashion. We introduce an auxiliary equation which is solved along with the displacement thickness to overcome the Goldstein singularity without the need to solve the entire flow domain simultaneously. In this work the incompressible Navier-Stokes equations will be used for the outer flow. In the majority of previous studies the boundary layer thickness is simulated using a wall transpiration boundary condition at the interface between viscous and inviscid flows. This boundary condition is inherently non-physical since it adds extra mass into the system to simulate the effects of the boundary layer. Here, we circumvent this drawback by the use of a mesh movement algorithm to shift the surface of the body outward without regridding the entire mesh. This replaces the transpiration boundary condition. The results obtained show that accurate modeling is possible for laminar incompressible flow and that the solutions obtained compare well to similarity solutions in the cases of flat and inclined plates and to the results of a NACA 0012 airfoil produced by the validated XFOIL code (Drela and Youngren, 2001).
Starting Page	181
Ending Page	191
Page Count	11
File Format	PDF
ISBN	9780791854877
DOI	10.1115/IMECE2011-62075
Volume Number	Volume 1: Advances in Aerospace Technology; Energy Water Nexus; Globalization of Engineering; Posters
Conference Proceedings	ASME 2011 International Mechanical Engineering Congress and Exposition
Language	English
Publisher Date	2011-11-11
Publisher Place	Denver, Colorado, USA
Access Restriction	Subscribed
Subject Keyword	Navier-stokes equations Computational fluid dynamics Aerodynamic flow Airfoils Drag (fluid dynamics) Separation (technology) Modeling Flow (dynamics) Aerospace industry Displacement Transpiration Algorithms Simulation Inviscid flow Plates (structures) Boundary-value problems Boundary layers
Content Type	Text
Resource Type	Article

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