Investigation of Unsteady Flow Physics around Blunt Shaped MAV using CFD

Abstract

Unsteady flow past three-dimensional blunt bodies such as sphere, rectangular parallelepiped, and circular cylinder has been numerically analyzed using Fluent to offer a design guideline for Micro Air Vehicle. Three-dimensional Navier-Stokes equations are solved with Large Eddy Simulation turbulence model. Three different aspect ratios of 1.0, 1.5, and 2.0 were selected to determine the effect of geometric shape on the unsteady flow physics in the Reynolds numbers ranging from 1000 to 10000. The mechanism of vortex shedding formation, the frequency and amplitude of the oscillating unsteady force coefficients including drag, lift, and side forces were investigated in this research. There are some differences in the vortex shedding patterns depending on the blunt body shapes. The frequency and the amplitude of the oscillating unsteady forces strongly depend on the blunt body shape, aspect ratio of the blunt body, and Reynolds number.

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Document Details

Document Type
Technical Report
Publication Date
Sep 24, 2010
Accession Number
ADA530046

Entities

People

  • Ji-woong Kim
  • Moon-sang Kim

Tags

Communities of Interest

  • Air Platforms
  • Energy and Power Technologies
  • Ground and Sea Platforms
  • Weapons Technologies

DTIC Thesaurus Topics

  • Aircrafts
  • Boundary Layer
  • Computational Fluid Dynamics
  • Flow Visualization
  • Fluid Dynamics
  • Fluid Flow
  • Fluid Mechanics
  • Hydrodynamics
  • Large Eddy Simulation
  • Mechanical Properties
  • Mechanics
  • Micro Air Vehicles
  • Reynolds Number
  • Three Dimensional
  • Turbulent Mixing
  • Two Dimensional
  • Vortex Shedding

Fields of Study

  • Physics

Readers

  • Aerodynamics.
  • Fluid Dynamics.
  • Structural Dynamics.