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 ?
Investigation of the influence of the Reynolds number on a plane jet using direct numerical simulation.
Direct numerical simulations of two- and three-dimensional turbulent natural convection flows in a differentially heated cavity of aspect ratio 4, J Fluid Mech 586: 259-293.
Direct numerical simulations (DNS) of the TDP can provide detailed information on variables that are difficult to measure, such as vorticity, the baroclinic torque, dissipation, and eddy fluxes of momentum, heat, and vorticity.
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.
Several typical cases in these two regimes will be examined using direct numerical simulation and will be discussed in this work.
As an alternative of Direct Numerical Simulation (DNS) [6], the Large Eddy Simulation (LES) technique is a promising approach [19-21].
of Greenwich, UK) present a text intended to be used as lecture material for postgraduate students and a reference for research scientists and engineers interested in direct numerical simulation and large-eddy simulation, which are advanced numerical tools for computational fluid dynamics that, compared to the traditional approach based on Reynolds-averaged Navier-Stokes modeling, offer enhanced capability in predicting the unsteady features of the flow field, such as the vortical structures, and provide a detailed solution of the flow field that can be used to develop models for mixing and turbulence.
Moreover, numerical methods such as direct numerical simulation (DNS) and Reynolds average Navier Stokes (RANS) have been applied to study the turbulent flow over riblets.
The direct numerical simulation of these models is extremely computationally expensive, since the typical timescale at the microscopic level is orders of magnitude smaller than the macroscopic timescales of interest.
This approach will allow me to reach unprecedented parameter regimes, Orders of magnitude beyond state-of-the-art 3d direct numerical simulations (dns).
Inflow and Outflow Boundary conditions for Direct Numerical Simulations, JSME International Journal, series B, vol.

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