16.121 | Fall 2017 | Graduate

Analytical Subsonic Aerodynamics

Calendar

SES # TOPICS KEY DATES
1

 Singular Perturbation Method

  • Subject overview
  • Motivation for the subject
  • Concept map
  • Compelling problems
  • Dimensional analysis, similarity
  • Asymptotics
  • A singular perturbation problem and solution [ODE, Ordinary Differential Equations]

 
2

Seminar in Perturbation Methods

  • A singular perturbation problem and solution [PDE, Partial Differential Equations]
  • Conservation principles
  • Pressure distribution and compressibility
  • Pressure—velocity relations in isentropic flow

 
3

Singular Perturbation Methods; Formation of Shock Waves

  • Similarity of flows
  • Equations governing irrotational flows of a homentropic gas
  • Velocity potential
  • Calorically perfect gas
  • Speed of sound

 
4

Fundamental of Fluid Mechanics

  • Small perturbation theory
  • Perturbation velocity potential
  • Perturbation velocity potential equation
  • Limit of small perturbations
  • Boundary conditions [steady flows]

 
5

Linear Subsonic Flow

  • Linearized pressure coefficient
  • Linearized subsonic flow
  • Transformation of independent variables
  • Prandtl-Glauert Rule

 
6

Similarity Rules

  • Similarity Rules
  • Dynamic and geometric variables
  • Afine body relationships
  • von Karman Rules

 
7—9

Bodies of Revolution: Slender Body Theory

  • Bodies of revolution—slender body theory
  • Cylindrical coordinates: x, r, θ
  • Continuity equation
  • Linearized perturbation potential equation
  • Boundary conditions: limit of r->0
  • Linearized pressure coefficient
  • Axial symmetry
  • Incompressible solution
  • Source distribution
  • Superposition Subsonic solution
  • f(x), S(x), R(x) relation

Problem set 1 out
10

Slender Body Theory

  • Slender body theory from a regular perturbation perspective
  • Transonic limit
  • Hypersonic limit

Problem set 1 due
11

Higher Approximation: Slope of the Lift and Moment About Mid-chord

  • Higher approximations for lift and moment about mid-chord

 
12—14

Perturbation Methods / Overview

  • Thin wing theory
  • Thickness, angle of attack, camber
  • Matched asymptotic expansions
  • Kutta-Joukowsky condition
  • Stretched variables
  • Boundary conditions
  • Inner and outer spaces
  • Inner and outer solutions
  • Downwash
  • Drag due to lift
  • Total drag

 
15

Thin Wing Theory

  • Two dimensional flow over a wavy wall

Problem set 2 out
16

Non-linear, Unsteady Transonic Waves

  • Summary
  • Review

Porblem set 2 due

Course Info

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Fall 2017
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