… In the present work, test filters with k c Δx=π/2 and k c Δx=π/3 are built up in this way. We
impose D k (0)=0, D k (π)=1 and D k k c Δ x =1/2 . For a sharp gradient near the cut-off …

This study investigates the noise radiated by a subsonic circular jet with a Mach number of
0.9 and a Reynolds number of 65000 computed by a compressible Large Eddy Simulation (…

… on symmetrical coefficients, one has to set c n = - c 1 - n and c j - c j + 1 = c - j - c 1 - j . The
coefficients of the damping functions are then antisymmetric with c j = - c 1 - j , and the filtering …

… In that way, Bogey3 and Bogey et al. 4 have calculated directly by LES the noise radiated
by a Mach 0.9 jet with a Reynolds number Re D 6: 5£ 104. Direct calculation of noise is quite …

… = 1 N ∑ | u c - u e | where u c and u e are respectively the … CFL = 1.2 and the RK26-Bogey
and RK46-NL calculations are … The second-order RK26-Bogey algorithm has the smallest …

… The speed of wave propagation, ιger, is the vector sum of the mean sound speed c and of
… [19] C. Bogey: Calcul direct du bruit aérodynamique et validation de mod`eles acoustiques …

… 13c and 13d, where the features of the eleven-point centered optimized finite differences Fd
55 built by Bogey and Bailly [4] are reported for comparison. The dispersion errors | k Δ x - R …

… The coefficients used for a non-centred filter are given in Appendix A, and results obtained
from additional simulations are shown in Appendices B and C to illustrate the very small …

… In the present article, results of LES of transitional round free jets at Mach number M = u j
∕ c 0 = 0.9 (where c 0 is the speed of sound in the ambient medium) are reported. The …

Large-eddy simulations (LESs) of isothermal round jets at a Mach number of 0.9 and a
diameter-based Reynolds number Re D of 10 5 originating from a pipe are performed using low-…