Theses and Dissertations
Issuing Body
Mississippi State University
Advisor
Janus, Mark Jonathan
Committee Member
Lim, Hyeona
Committee Member
Banicescu, Ioana
Committee Member
Koenig, Keith
Date of Degree
8-7-2010
Original embargo terms
MSU Only Indefinitely
Document Type
Dissertation - Campus Access Only
Major
Computational Engineering (Program)
Degree Name
Doctor of Philosophy
College
James Worth Bagley College of Engineering
Department
Department of Computational Engineering
Abstract
A numerical technique is developed to simulate the vortices associated with stationary and flapping wings. The Unsteady Reynolds-Averaged Navier-Stokes (URANS) equations are used over an unstructured grid. The present work assesses the locations of the origins of vortex generation, models those locations and develops a systematic mesh refinement strategy to simulate vortices more accurately using the URANS model. The vortex center plays a key role in the analysis of the simulation data. A novel approach to locating a vortex center is also developed referred to as the Max-Max criterion. Experimental validation of the simulated vortex from a stationary NACA0012 wing is achieved. The tangential velocity along the core of the vortex falls within five percent of the experimental data in the case of the stationary NACA0012 simulation. The wing surface pressure coefficient also matches with the experimental data. The refinement techniques are then focused on unsteady simulations of pitching and dual-mode wing flapping. Tip vortex strength, location, and wing surface pressure are analyzed. Links to vortex behavior and wing motion are inferred.
URI
https://hdl.handle.net/11668/16296
Recommended Citation
Ahmad, Shakeel, "Advanced numerical techniques for accurate unsteady simulations of a wingtip vortex" (2010). Theses and Dissertations. 403.
https://scholarsjunction.msstate.edu/td/403