A CFD Study of the Aerodynamics of a 6x6x8 Foot Cargo Container Suspended Beneath a Helicopter. Part 1: Aerodynamics of the Stationary Container

This report is the first of several on a study of the unsteady aerodynamics of the CONEX cargo container This work is in support of an effort to develop a model of the CONEX unsteady aerodynamics for use in simulations of helicopter-slung-load dynamics It is known from the literature on cargo contai...

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Bibliographic Details
Main Authors: Theron, Johannes N, Duque, Earl P, Cicolani, Luigi
Format: Report
Language:English
Subjects:
Aerodynamics
CARGO
CARGO CONTAINERS
COMPUTATIONAL FLUID DYNAMICS
CONTAINERS
Containers and Packaging
EXPERIMENTAL DATA
FLOW
Fluid Mechanics
HELICOPTERS
Logistics, Military Facilities and Supplies
NAVIER STOKES EQUATIONS
OVERFLOW
QUASI-STATIC AERODYNAMICS
REYNOLDS NUMBER
STATICS
STATIONARY
STATIONARY CONTAINERS
STEADY FLOW
UNSTEADY AERODYNAMICS
UNSTEADY FLOW
VORTEX SHEDDING
WIND TUNNEL TESTS
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Summary:This report is the first of several on a study of the unsteady aerodynamics of the CONEX cargo container This work is in support of an effort to develop a model of the CONEX unsteady aerodynamics for use in simulations of helicopter-slung-load dynamics It is known from the literature on cargo container aerodynamics that instability is caused by unsteady flow effects such as vortex shedding and flow structure lags and cannot be predicted by simple models that utilize only the static and quasi-static aerodynamics of the container This report describes the first phase of the work to develop the CED computational setup, validate it against the available wind tunnel data for the stationary CONEX, and provide some material on flow structure around the stationary CONEX Results are given for both steady flow and unsteady flow CED simulations. The Reynolds-averaged Navier-Stokes code known as OVERFLOW developed by NASA was used for this work. Prepared in cooperation with San Jose Univ. Foundation, Moffett, CA.