present paper investigates the numerical solution of two-dimensional unsteady compressible navier-stokes equations by a new scheme based on the finite volume method. kinetic energy preserving (kep) scheme is introduced for solving the supersonic and transonic external compressible flow field on very fine grids (with a number of cells of the order of the reynolds number) without artificial dissi...

The acoustic radiation from isotropic turbulence is computed numerically. A hybrid direct numerical simulation approach which combines direct numerical simulation (DNS) of the turbulent ow with the Lighthill acoustic analogy is utilized. It is demonstrated that the hybrid DNS method is a feasible approach to the computation of sound generated by turbulent ows. The acoustic e ciency in the simul...

A novel numerical method has been developed to couple a recent high order accurate fully compressible upwind method with the Conditional Moment Closure combustion model. The governing equations, turbulence modelling and numerical methods are presented in full. The new numerical method is validated against Direct Numerical Simulation (DNS) data for a lean premixed methane slot burner. Although t...

Direct numerical simulation (DNS) of turbulence is computationally very intensive and typically relies on some form of parallel processing. Spectral kernels used for spatial discretization are a common computational bottleneck on distributed memory architectures. One way to increase the efficiency of DNS algorithms is to parallelize spectral kernels using tightlycoupled Single-Program-Multiple-...

A parallel, finite-volume algorithm has been developed for large-eddy simulation (LES) of compressible turbulent flows. This algorithm includes piecewise linear least-square reconstruction, trilinear finite-element interpolation, Roe flux-difference splitting, and second-order MacCormack time marching. Parallel implementation is done using the message-passing programming model. In this paper, t...

The very small scales of isotropic, Navier-Stokes turbulence at Reynolds number Rλ ≈ 15 are studied by high-resolution direct numerical simulation (DNS) and by integration of the direct-interaction (DIA) equations. The DNS follows the tail of the energy spectrum over more than thirty decades of magnitude. The energy spectrum in the far-dissipation range 5kd < k < 10kd is well-fitted by k α exp(...

Submit Manuscript | http://medcraveonline.com Space Agency; MELOS: Mars Exploration with Lander-Orbiter Synergy; JAXA: Japan Aerospace Exploration Agency; ARES: Aerial Regional-scale Environmental Survey; L/D: Lift-to-Drag Ratio; LES: Large-Eddy Simulations; DNS: Direct Numerical Simulation; MABE: Mars Airplane Balloon Experiment; RANS: Reynolds Averaged Navier-Stokes; CFRP: Carbon Fiber-Reinfo...

The viability of the Variational Multi-Scale (VMS), an approach for Large Eddy Simulation (LES), in the context of turbulence control is explored. First, we validate our VMS implementation for a fully-developed turbulent channel. Later, VMS results for opposition control of the turbulent channel flow are compared against available Direct Numerical Simulation (DNS) and LES using dynamic subgrid-...

A study of instabilities in incompressible boundary-layer ow on a at plate is conducted by spatial direct numerical simulation (DNS) of the Navier-Stokes equations. Here, the DNS results are used to critically evaluate the results obtained using parabolized stability equations (PSE) theory and to study mechanisms associated with breakdown from laminar to turbulent ow. Three test cases are consi...

Direct Numerical Simulation (DNS) of reacting ows became, in the last decade, one of the most attractive tools to study turbulent combustion. A high order nite diierence method is used here to perform DNS of methane-air ames. An eecient parallel implementation based on domain decomposition methods in order to perform DNS on MPP platforms is presented in this paper. A 64 processor Cenju-3 comput...