Department of Mechanical Engineering,Ferdowsi University of Mashhad
In this paper, a three-dimensional code is developed to solve turbulent supersonic flows over a blunt-nose-cylinder at 32\degree\ and 44\degree\ angles of attack. The method used is an explicit finite-volume Runge-Kutta time stepping model for unsteady, three-dimensional, full, Navier-Stokes equations. This model can handle arbitrary geometries by using general coordinate transformations. The flowfields under consideration contain extensive regions of crossflow separation. The Reynolds shear stress terms are modeled algebraically with modifications to correct the turbulent length and velocity scales in separated regions. Calculations performed using the developed code require a computational memory accessible on most personal computers. Numerical results are in good agreement with experimental measurements. Comparisons of turbulent flow with graphical visualization by means of helicity revealed that the Runge-Kutta time stepping algorithm conserves symmetry at high angles of attack.