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• W774014709 abstract "A numerical method has been developed for solving the complete compressible Navier-Stokes equations. The method is applicable for Direct Numerical Simula­ tions (DNS) and Large-Eddy Simulations (LES) and was used here to study the evo­ lution of three-dimensional disturbances in the laminar and turbulent near wake of axisymmetric bluff bodies with a blunt base in supersonic flows. The main objective of this research is to investigate the time dependent behavior of these disturbances and their influence on and interaction with the global flow field. The equations are solved in a cylindrical coordinate system using finite difference approximations of fourth-order accuracy in axial and radial directions and and a fourth-order accurate explicit Runge-Kutta scheme for the time integration. A pseudo-spectral method is employed in the azimuthal direction. Direct Numerical Simulations (DNS) were performed for a subsonic free stream Mach number of Moo = 0.2 and for supersonic free stream Mach numbers of Moo = 1.2 and = 2.46. Large-Eddy Simula­ tions (LES) were carried out for a subsonic free stream Mach number of M^o = 0.2 and a global Reynolds number of BtD = 2,000 and for a supersonic free stream Mach number of M^o = 2.46 and global Reynolds numbers of Be-d = 30,000 and Bs-d = 100,000. Comparison of the instantaneous flow field for subsonic calcula­ tions with water channel experiments and incompressible simulations show good qualitative agreement. An absolute instability with regard to helical disturbances was found for the subsonic flow at Fho = 1,000 and for the supersonic flows for Moo = 1.2 and /feo > 4,000 and for Moo = 2.46 and fko > 30,000. Small dis­ turbances appear in the flow field near the corner of the base. As the disturbances are propagating downstream they grow and form intense vortical structures. These structures have a strong influence on the flow field, which results in a drastic change of the base pressure distribution and thus of the base drag." @default.
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• W774014709 date "1996-01-01" @default.
• W774014709 modified "2023-09-27" @default.
• W774014709 title "Numerical investigation of transitional and turbulent compressible axisymmetric wakes" @default.
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