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Automated Boundary Conditions for Wind Tunnel SimulationsComputational fluid dynamic (CFD) simulations of models tested in wind tunnels require a high level of fidelity and accuracy particularly for the purposes of CFD validation efforts. Considerable effort is required to ensure the proper characterization of both the physical geometry of the wind tunnel and recreating the correct flow conditions inside the wind tunnel. The typical trial-and-error effort used for determining the boundary condition values for a particular tunnel configuration are time and computer resource intensive. This paper describes a method for calculating and updating the back pressure boundary condition in wind tunnel simulations by using a proportional-integral-derivative controller. The controller methodology and equations are discussed, and simulations using the controller to set a tunnel Mach number in the NASA Langley 14- by 22-Foot Subsonic Tunnel are demonstrated.
Document ID
20180002095
Acquisition Source
Langley Research Center
Document Type
Technical Memorandum (TM)
Authors
Carlson, Jan-Renee (NASA Langley Research Center Hampton, VA, United States)
Date Acquired
March 23, 2018
Publication Date
March 1, 2018
Subject Category
Aeronautics (General)
Report/Patent Number
L-20913
NASA/TM-2018-219812
NF1676L-29535
Funding Number(s)
WBS: WBS 109492.02.07.01.01
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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