Mohamad Reza. Mohaghegh and Majid. Malek Jafarian
Unsteady Transonic Aerodynamic Analysis for Oscillatory Airfoils using Time Spectral Method
488 - 495
2011
5
2
International Journal of Aerospace and Mechanical Engineering
https://publications.waset.org/pdf/5669
https://publications.waset.org/vol/50
World Academy of Science, Engineering and Technology
This research proposes an algorithm for the simulation
of timeperiodic unsteady problems via the solution unsteady Euler
and NavierStokes equations. This algorithm which is called Time
Spectral method uses a Fourier representation in time and hence
solve for the periodic state directly without resolving transients
(which consume most of the resources in a timeaccurate scheme).
Mathematical tools used here are discrete Fourier transformations. It
has shown tremendous potential for reducing the computational cost
compared to conventional timeaccurate methods, by enforcing
periodicity and using Fourier representation in time, leading to
spectral accuracy. The accuracy and efficiency of this technique is
verified by Euler and NavierStokes calculations for pitching airfoils.
Because of flow turbulence nature, BaldwinLomax turbulence
model has been used at viscous flow analysis. The results presented
by the Time Spectral method are compared with experimental data. It
has shown tremendous potential for reducing the computational cost
compared to the conventional timeaccurate methods, by enforcing
periodicity and using Fourier representation in time, leading to
spectral accuracy, because results verify the small number of time
intervals per pitching cycle required to capture the flow physics.
Open Science Index 50, 2011