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   A Fast Immersed Boundary Fourier Pseudo-Spectral Method For Simulation of the Incompressible Flows  
   
نویسنده Sabetghadam F. ,Soltani E. ,Ghasemi H.
منبع International Journal Of Engineering - 2014 - دوره : 27 - شماره : 9 - صفحه:1457 -1466
چکیده    The present paper is devoted to implementation of the immersed boundary technique into the fourierpseudo-spectral solution of the vorticity-velocity formulation of the two-dimensional incompressiblenavier-stokes equations. the immersed boundary conditions are implemented via direct modificationof the convection and diffusion terms, and therefore, in contrast to some other similar methods, there is not an explicit external forcing function in the present formulation. at the beginning of each time step, the solenoidal velocities (also satisfying the desired immersed boundary conditions), are obtained and fed into a conventional pseudo-spectral solver, together with a modified vorticity. the classical explicit fourth-order runge-kutta method is used in time integration, and the boundary conditions are set at the beginning of each sub-step, in order to increase the time accuracy. the method is employed in simulation of some different test cases, including the flow behind impulsively started circular cylinder, oscillating circular cylinder in fluid at rest and insect-like flapping wing motion. the results show accuracy and efficiency of the method.
کلیدواژه Immersed Boundary Method ,Vorticity-Velocity Formulation ,Pseudo-Spectral Method ,Moving Obstacles
آدرس Islamic Azad University (Iau), Science And Research Branch, Mechanical And Aerospace Engineering Faculty, ایران, Islamic Azad University (Iau), Science And Research Branch, Mechanical And Aerospace Engineering Faculty, ایران, Amirkabir University Of Technology, Department Of Maritime Engineering, ایران
 
     
   
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