Simulating turbulent viscous high–speed flows on unstructured grids
نویسندگان
چکیده
This paper discusses ongoing work on an all-Mach number, non–dissipative algorithm to solve compressible flows on unstructured grids. The algorithm is capable of handling unstructured grids, which allow efficient and speedy generation of computational meshes for complex geometries. The novel feature of the algorithm is an incompressible scaling for pressure that naturally yields the divergence–free condition for velocity as the Mach number goes to zero. The desirable feature of this algorithm is the discrete conservation of kinetic energy in the incompressible flow limit which in turn ensures robustness of the calculation at high Reynolds numbers without the need for any numerical dissipation. We employ a characteristic filter based shock capturing scheme that is applied as a predictor–corrector approach. As a result, shock capturing is active only in the regions of discontinuities, and provides accurate non–dissipative solutions away from the shocks. Results of the algorithm on representative validation flows are presented.
منابع مشابه
High-reynolds Number Viscous Flow Computations Using an Unstructured-grid Method
An unstructured grid method is presented to compute three-dimensional compressible turbulent flows for complex geometries. The Navier-Stokes equations along with the one equation turbulence model of Spalart-Allmaras are solved using a parallel, matrix-free implicit method on unstructured tetrahedral grids. The developed method has been used to predict drags in the transonic regime for both DLRF...
متن کاملAssessment of Unstructured Grids for Detached- Eddy Simulation of High Reynolds Number Sepa- rated Flows
An assessment of unstructured grids for use in Detached-Eddy Simulation (and more generally in Large-Eddy Simulation) of massively separated ows is presented. The role of the grid, its generation and re nement, are considered via calculation of three high-Reynolds number turbulent ows of aerodynamic interest: the massively separated ow over a forebody in cross ow, the ow over a delta wing at 27...
متن کاملOverview of Direct Numerical Simulation of Particle Entrainment in Turbulent Flows
An overview of removal and re-entrainment of particles in turbulent flows is presented. The procedure for the direct numerical simulation (DNS) of the Navier-Stokes equation via a pseudospectral method for simulating the instantaneous fluid velocity field is described. Particle removal mechanisms in turbulent flows in a duct are examined and effects of the near-wall coherent eddies on the parti...
متن کاملDNS of unsteady shock boundary layer interaction
A novel numerical scheme has been developed to simulate high speed viscous flows in complex geometries using unstructured grids. A characteristic–filter based shock capturing scheme is applied as a corrector step to a non–dissipative predictor scheme. This algorithm is being used to study shock turbulent boundary layer interactions and this paper presents the results of a turbulent flow at Mach...
متن کامل