Sharif Digital Repository

At this project, at first step has been tried to solve the flow over a plate using unsteady vortex lattice method that reached to this purpose considering reference [5] and using available code at this book. And due to existent limitations of above code, has been tried to promote it to more complex three-dimensional modes. And at next step, the code has been approved using Wagner and Theodorsen theoretical methods and then the results validated with others results. Finally, after confidence of numerical results of the written code, has been studied the effect of design parameters on the Ornithopter aerodynamics parameters to can reach to final purpose that is optimum aerodynamic shape for... 

In the current study, stability and nonlinear vibration of bending-torsional extensible beams conveying internal pulsatile and uniform external flow are studied. The internal and external fluid flows are assumed to be incompressible and frictionless. Applying the extensibility to the pipe along its length and using the nonlinear Euler-Bernoulli beam model and including some appropriate additional assumptions, the 3D nonlinear equations of motion of a cantilevered composite pipe is obtained. In order to derive the equations governing the fluid-structure interaction, the internal flow effect is modeled as a distributed load along the pipe which contains the inertia, Coriolis and centrifugal...