direct numerical simulation


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direct numerical simulation

[də¦rekt nü¦mer·ə·kəl ‚sim·yə′lā·shən]
(fluid mechanics)
Simulation of fluid flow that is carried out through numerical integration of the Navier-Stokes equation in a two-stage process: a temporal approximation involving the splitting of the equation into linear and nonlinear parts and the approximation of time derivatives with finite differences, and a spatial approximation involving the replacement of spatial derivatives with finite difference, finite element, spectral, or hybrid numerical approximations. Abbreviated DNS.
References in periodicals archive ?
Rigorous derivation of the upscaled model can be found in [21], comparison with direct numerical simulation can be found in [29].
[12.] Luo, K., Pitsch, H., Pai, M.G., and Desjardins, O., "Direct numerical simulations and analysis of three-dimensional n-heptane spray flames in a model swirl combustor," Proceedings of the Combustion Institute 33(2):2143-2152, 2011, doi:10.1016/j.proci.2010.06.077.
Direct numerical simulations of two-dimensional chaotic natural convection in a differentially heated cavity of aspect ratio 4, J Fluid Mech 304: 87-118.
Moin, "Direct numerical simulation of transition and turbulence in a spatially evolving," Journal of Computational Physics, vol.
Direct numerical simulation of turbulent forced convection in a pipe, Int.
Different cases were compared using a direct numerical simulation and the results show that a constant velocity inflow is more unstable than a Poiseuille inflow.
Direct numerical simulation is performed as discussed here.
Through advances in computational capabilities, it is now possible to carry out direct numerical simulation of Rayleigh-Taylor, Kelvin-Helmholtz, and Richtmyer-Meshkov hydrodynamic instabilities.
FDS has also the option to use a Direct Numerical Simulation (DNS) if the numerical grid is fine enough.
In recent years, direct numerical simulation techniques have been applied to study the bubble rise behaviour.
As LES is able to obtain more information of the turbulent flow field compared to RANS (Reynolds-Averaged Navier-Stokes) model, whilst less computational requirement is needed relative to DNS (Direct Numerical Simulation), LES has been expected to be the main way to model engine combustion.

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