Bulletin of the American Physical Society
76th Annual Meeting of the Division of Fluid Dynamics
Sunday–Tuesday, November 19–21, 2023; Washington, DC
Session L04: Aerodynamics: General
8:00 AM–10:36 AM,
Monday, November 20, 2023
Room: 101
Chair: Oliver Wild, University of Maryland, College Park
Abstract: L04.00006 : Normal Force and Pitch Moment for a 6:1 Prolate Spheroid at Moderate Reynolds Numbers*
9:05 AM–9:18 AM
Presenter:
Ethan E Lust
(US Naval Academy)
Author:
Ethan E Lust
(US Naval Academy)
Collaboration:
Office of Naval Research HIgh Reynolds Number PROlate Spheroid (HIPRO) Program
The prolate spheroid has long been a favored reference for the development of CFD tools. It is simple to describe mathematically, yet the flow around it is highly three-dimensional, featuring laminar to turbulent transition, laminar and turbulent separation, reattachment, and multiple sets of trailing vortices, depending on the flow conditions. These phenomena provide a range of specific features against which to compare numerical results. However, gross measures, including forces and moments, provide a first-order reference in the validation process.
The normal force and pitch moment were measured for a 6:1 prolate spheroid in the large towing tank facility at the U.S. Naval Academy for Reynolds numbers from 0.4-9×106 and angles of attack from 2.5° to 20°. The results of this work agree well with previous studies and expand the range of Reynolds numbers significantly. A detailed description of materials and methods is provided to support CFD model validation.
*This work was sponsored by Dr. Peter Chang at the Office of Naval Research.
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