FreeCASE - Free(dom) Computational AeroServoElasticity
Last update:
January 31. 2013 07:50:49

YF-17 fighter

In this section we present the numerical results of AeroFoam solver for a 3D aerodynamic test problem, such as the inviscid compressible unsteady flow around a YF-17 fighter.

Problem definition

  • Domain:
    • Internal YF-17 half-model subdomain
    • External hexahedral subdomain of size 14 m x 12 m x 12 m
  • Material:
    • Polytropic Ideal Gas (PIG)
    • Specific heat ratio gamma = 1.4
    • Gas thermodynamic constant R = 287.05 J/kgK
  • Initial conditions: 
    • Thermodynamic pressure Poo = 46040 Pa
    • Temperature Too = 248.00 K
    • Mach number Moo = 0.28
    • Angle of attack alpha = 19.4 deg
  • Boundary conditions:
    • Slip boundary conditions on internal subdomain
    • SupersonicInlet boundary conditions on airduct and engine boundary sub-patches compatible with a turbofan engine total thrust of T = 28e3 N
    • SymmetryPlane boundary conditions on symmetry plane
    • Riemann boundary conditions on external subdomain


Figure: Wind tunnel model for the YF-17 fighter.

Space and time discretization

  • Space discretization:
    • Mesh downloaded from CGNS repository (many thanks to Bruce Wedan) and then converted in Gmsh format with a small utility written in SciLab
    • # of tetrahedral cells Nv = 528515
    • # of nodes Nn = 97104
  • Time discretization:
    • Total simulation time endTime = 0.2 s
    • Timestep deltaT = 1.25e-6 s
    • Maximum Courant number maxCo =  1.95


Figure:
Computational grid.

Numerical results

  • Comparison (only qualitative) with F-18 HARV flight test visualizations
  • Single iteration CPUtime = 5.10 s on AMD64 3500+ desktop PC with AMD Athlon 64 2.2 GHz CPU, 1 Gbyte RAM, 512 Kbyte L2 cache


Figure: Thermodynamic pressure P contours and streamlines.



Figure:
Pressure coefficient Cp contours.

Download

  • YF17.tar.gz test problem folder. Uncompress this archive in the OpenFOAM work folder and execute AeroFoam . YF17_530k_M028_a19 from terminal to start the simulation. Download.



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