The initial values used in the LES computations were those obtained by filtering the DNS data at t = 2.0, where 32, 32 and 32 grid points were used, respectively, in the x, y, and z directions. The value of Re λ (Reynolds number based on the Taylor microscale and root-mean-square value of the velocity fluctuation) at the initial instant ( t = 2.0) was 72.2. Rotation was applied to the DNS data generated with Ω= 0.0 at t = 2.0 when the initial transient period elapsed. The angular velocity for the rotation, Ω, was chosen equal to 10.0. The size of the computational domain was 2π in each direction, the kinematic viscosity, ν, was set equal to 0.00014, and the time interval, Δ t, was set equal to 0.0005. Periodic boundary conditions were imposed in the three directions. To generate the DNS data, 256, 256, and 256 grid points were used in the x, y and z directions, respectively. The pseudospectral Fourier expansion method was used for both DNS and LES. ![]() In this section, we carry out ‘a posteriori’ assessment of the SGS models by using them in actual LES computations. ![]() Kiyosi Horiuti, in Engineering Turbulence Modelling and Experime3 A posteriori assessment of the proposed SGS model
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