VorTran-M Wake Module

Accurate performance prediction is essential to the development, design, and analysis of rotorcraft. While current numerical analysis tools can, in principle, model complete rotorcraft, in practice these implementations are severely hampered by accuracy limitations broadly attributed to modeling assumptions (e.g. vortex core models in Lagrangian methods) or numerical deficiencies (e.g. excessive numerical diffusion for Eulerian CFD). Thus, commonly used analysis tools fail to adequately predict the unsteady wakes and load distributions of rotor and fuselage designs. An approach that combines the first-principles physical modeling capability of Eulerian schemes with the vortex preservation capabilities of Lagrangian vortex techniques has long been needed. Enabled by breakthrough technologies in Eulerian wake modeling [1, 2] that specifically address the critical numerical diffusion issue, the VorTran-M wake module is a first-principles Eulerian vorticity transport wake module that provides an unprecedented ability to capture the true temporal and spatial structure of the rotor wake when coupled to a wide range of Eulerian and Lagrangian CFD tools.

While originally designed to address the numerical diffusion of vorticity associated with the simulation of rotorcraft wakes, this model is equally capable of modeling other vortex-dominated flows such as those associated with ship airwakes, road-vehicles and other bluff bodies.

Read more about VorTran-M...

1. Brown, R.E., 2000, "Rotor Wake Modeling for Flight Dynamic Simulation of Helicopters", AIAA Journal, Vol. 38, No. 1, pp. 57-63.
2. Brown, R.E. and Line, A.J., 2005, "Efficient High-Resolution Wake Modelling using the Vorticity Transport Equation", AIAA Journal, Vol. 43, No. 7, pp. 1434–1443
3. Whitehouse, G.R., Boschitsch, A.H., Quackenbush, T.R., Wachspress, D.A. and Brown, R.E., 2007, "Novel Eulerian Vorticity Transport Wake Module for Rotorcraft Flow Analysis," 63rd Annual Forum of the American Helicopter Society, Virginia Beach, VA.

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