New Vortex Dynamics Methods for Rotor Free Wake Analysis

Abstract

This report summarizes recent work on rotorcraft aerodynamics involving novel methods for rotor free wake calculations. A new method called Analytical/Numerical Matching (ANM) was developed. ANM is a hybrid analytical and numerical method that achieves accurate results by combining a low resolution numerical solution with a high resolution analytical solution. Although originally developed for vortex dynamics, ANM has proven to be of a general nature. The application of ANM to the rotor wake problem provides accurate answers with a significant reduction in computation time. The use of ANM introduces the opportunity to develop new solution strategies, including Far-Field Linearization and Periodic Inversion. These methods afford the means to obtain accurate solutions Over the entire flight regime. Work involving applications of ANM has also led to a scheme that represents vortex filament dynamics by a hierarchy of nested problems of varying resolution joined by matching solutions. This approach, called ANM with Pyramiding (ANM/P), has reduced calculation times by more than a factor of twenty in some sample problems.

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Document Details

Document Type
Technical Report
Publication Date
May 01, 1993
Accession Number
ADA266656

Entities

People

  • Donald B. Bliss

Organizations

  • Duke University

Tags

DTIC Thesaurus Topics

  • Aircrafts
  • Airframes
  • Computational Fluid Dynamics
  • Computational Science
  • Computer Programs
  • Computers
  • Engineering
  • Equations
  • Fluid Dynamics
  • Geometric Forms
  • Geometry
  • Linear Systems
  • Materials
  • Materials Science
  • Mechanical Engineering
  • Rotary Wing Aircraft
  • Two Dimensional

Readers

  • Finite Element Method (FEM) for solving Partial Differential Equations (PDEs)
  • Fluid Mechanics and Fluid Dynamics.