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Calculation of water drop trajectories to and about arbitrary three-dimensional lifting and nonlifting bodies in potential airflowSubsonic, external flow about nonlifting bodies, lifting bodies or combinations of lifting and nonlifting bodies is calculated by a modified version of the Hess lifting code. Trajectory calculations can be performed for any atmospheric conditions and for all water drop sizes, from the smallest cloud droplet to large raindrops. Experimental water drop drag relations are used in the water drop equations of motion and effects of gravity settling are included. Inlet flow can be accommodated, and high Mach number compressibility effects are corrected for approximately. Seven codes are described: (1) a code used to debug and plot body surface description data; (2) a code that processes the body surface data to yield the potential flow field; (3) a code that computes flow velocities at arrays of points in space; (4) a code that computes water drop trajectories from an array of points in space; (5) a code that computes water drop trajectories and fluxes to arbitrary target points; (6) a code that computes water drop trajectories tangent to the body; and (7) a code that produces stereo pair plots which include both the body and trajectories. Accuracy of the calculations is discussed, and trajectory calculation results are compared with prior calculations and with experimental data.
Document ID
19870002261
Document Type
Contractor Report (CR)
Authors
Norment, H. G. (Atmospheric Science Associates Bedford, MA, United States)
Date Acquired
September 5, 2013
Publication Date
October 1, 1985
Subject Category
AERODYNAMICS
Report/Patent Number
NAS 1.26:3935
E-2687
NASA-CR-3935
Funding Number(s)
CONTRACT_GRANT: NAS3-22146
PROJECT: RTOP 505-45-54
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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