Ali Heydari; Seid H. Dr. Pourtakdoust

Volume 5, Issue 2 , June 2008, Pages 51-56

  Conventional magnetic attitude control methodologies require several orbital periods to accomplish the required attitude maneuvers due to the existence of an uncontrollable axis, namely the local Earth’s magnetic field vector. Since in some attitude maneuver missions the elapsed time is of critical ...  Read More

Numerical Simulation of Separation Bubble on Elliptic Cylinders Using Three-equation k-? Turbulence Model

Reza Dr. Taghavi

Volume 5, Issue 2 , June 2008, Pages 57-66

  Occurrence of laminar separation bubbles on solid walls of an elliptic cylinder has been simulated using a recently developed transitional model for boundary layer flows. Computational method is based on the solution of the Reynolds averaged Navier-Stokes (RANS) equations and the eddy-viscosity concept. ...  Read More

Development of a novel method in TRMC for a Binary Gas Flow Inside a Rotating Cylinder

A. A. Ganjaei; S. Salman Dr. Noor Azar

Volume 5, Issue 2 , June 2008, Pages 67-79

  A new approach to calculate the axially symmetric binary gas flow is proposed Dalton’s law for partial pressures contributed by each species of a binary gas mixture (argon and helium) is incorporated into numerical simulation of rarefied axially symmetric flow inside a rotating cylinder using the time ...  Read More

Construction of Hexahedral Block Topology and its Decomposition to Generate Initial Tetrahedral Grids for Aerodynamic Applications

Seyed Saied Bahrainian

Volume 5, Issue 2 , June 2008, Pages 81-90

  Making an initial tetrahedral grid for complex geometry can be a tedious and time consuming task. This paper describes a novel procedure for generation of starting tetrahedral cells using hexahedral block topology. Hexahedral blocks are arranged around an aerodynamic body to form a flow domain. Each ...  Read More

Parametric Study of Plastic Load of Cylindrical Shells With Opening Subject to Combined Loading

R. A. Alashti

Volume 5, Issue 2 , June 2008, Pages 91-98

  In this paper, the plastic limit load of cylindrical shells with opening subject to combined bending moment and axial force are found by finite element method using ANSYS suite of program. The effect of various parameters such as the geometrical ratios of shell and the shape, size, axial and angular ...  Read More