An alternative approach to large-eddy simulation based on approximate deconvolution (ADM) is developed. The main ingredient an approximation of the nonfiltered field by truncated series expansion inverse filter operator. A posteriori tests for decaying compressible isotropic turbulence show excellent agreement with direct numerical simulation. computational overhead ADM similar that a scale-similarity model and considerably less than dynamic models.

The approximate deconvolution model (ADM) for the large-eddy simulation of incompressible flows is detailed and applied to turbulent channel flow. With this approach an approximation unfiltered solution obtained by repeated filtering. Given a good solution, nonlinear terms filtered Navier–Stokes equations can be computed directly. effect nonrepresented scales modeled relaxation regularization involving secondary filter operation. Large-eddy simulations are performed flow at Reynolds numbers...

Abstract The unsteady behaviour in shockwave turbulent boundary layer interaction is investigated by analysing results from a large eddy simulation of supersonic over compression–expansion ramp. leads to very-low-frequency motion near the foot shock, with characteristic frequency that three orders magnitude lower than typical incoming layer. Wall pressure data are first analysed means Fourier analysis, highlighting low-frequency phenomenon region. Furthermore, flow dynamics dynamic mode...

The turbulent boundary layer along a compression ramp with deflection angle of 18° at free-stream Mach number M = 3 and Reynolds Re θ 1685 respect to quantities mean momentum thickness inflow is studied by direct numerical simulation. conservation equations for mass, momentum, energy are solved in generalized coordinates using 5th-order hybrid compact- finite-difference-ENO scheme the spatial discretization convective fluxes 6th-order central compact finite differences diffusive fluxes. For...

A formulation of the approximate deconvolution model (ADM) for large-eddy simulation (LES) compressible flows in complex geometries is detailed. The applied to supersonic compression ramp flow where shock-turbulence interaction occurs. With ADM approach an approximation unfiltered solution obtained from filtered by a series expansion involving repeated filtering. Given sufficiently good at time instant, flux terms underlying transport equations can be computed directly, avoiding need...

Well-resolved large-eddy simulations (LES) are performed in order to investigate flow phenomena and turbulence structure of the boundary layer along a supersonic compression ramp. The numerical directly reproduce an available experimental result. ramp has deflection angle grid points used for discretizing computational domain. To obtain mean is sampled 1272 times over 703 characteristic time scales incoming layer. Statistical data computed from these samples. An analysis shows good agreement...

We analyse the low-frequency dynamics of a high Reynolds number impinging shock-wave/turbulent boundary-layer interaction (SWBLI) with strong mean-flow separation. The flow configuration for our grid-converged large-eddy simulations (LES) reproduces recent experiments Mach 3 turbulent boundary layer an shock that nominally deflects incoming by $19.6^{\circ }$ . based on thickness $Re_{\unicode[STIX]{x1D6FF}_{0}}\approx 203\times 10^{3}$ is considerably higher than in previous LES studies....

For non-Newtonian liquids in steady rectilinear shear flow which liquid planes x2 constant move parallel to the x-axis of a rectangular Cartesian co-ordinate system 0x, x2x3, three normal components stress p11, p22, p33 are general not all equal. Their differences can be determined from radial distributions pressure (-p22) on plate cone-and-plate (‘ cp’)or pair plates (‘pp’) relative rotation: (a) quantity p11+p22-2p33 is equal gradient d/>22/d In r)cp (b) p22 — (under suitable...