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Gradient trajectories recently received attention in the context of dissipation elements, which are space-filling regions whose theoretical description has successfully been tested via Direct Numerical Simulations (DNS) of homogenous shear flows by Wang and Peters (J. Fluid Mech. 554: 457–475, 2006; J. Fluid Mech. 608: 113–138, 2008). In the present work, the DNS of a Kolmogorov flow is evaluated...
In this work, a matrix (inversion) free exact viscous linearization procedure for implicit compressible flow solvers in unstructured mesh framework is developed. Novel feature of this procedure is to solve RANS equations for a finite volume in a coordinate system aligned to the Principal axes of viscous stress tensor. For RAE aerofoil, it is demonstrated that the proposed procedure is more robust...
A direct numerical simulation of the shock/turbulent boundary layer interaction flow in a supersonic 24-degree compression ramp is conducted with the free stream Mach number 2.9. The blow-and-suction disturbance in the upstream wall boundary is used to trigger the transition. Both the mean wall pressure and the velocity profiles agree with those of the experimental data, which validates the simulation...
A new simple method is presented for generating velocity fluctuations at the inflow of LES domain in Embedded LES. The method employs only RANS turbulence statistics and is shown to be rather accurate in both canonical shear flows (plane channel, zero pressure gradient boundary layer, and plane mixing layer) and in a wall-mounted hump flow with pressure-induced separation and reattachment.
The isothermal unsteady turbulent flow driven by a rotating magnetic field in a square container at Taylor number $$1 \times 10^6$$ was investigated numerically using in-house CFD code. The quasi isothermal electrically conducting fluid was exposed by the higher intensity of the magnetic induction, and consequently, the induced flow turned up to be turbulent at higher Reynolds or Taylor numbers...
We assess the quality of three types of finite difference schemes for LES of Taylor–Green vortex flow: the standard Taylor-based schemes, Dispersion-Relation Preserving (DRP) schemes (Tam and Webb, J. Comput. Phys. 107:262–281, 1993) and the dynamic finite difference (DFD) schemes of Fauconnier et al. (J. Comput. Phys. 228(21):8053–8084, 2009). DRP schemes and DFD schemes reduce substantially the...
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