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For comparison, also the theoretical growth envelope from inviscid linear stability theory is plotted. The initial linear viscously damped growth of the instability is well represented in DNS and LES, confirming that the inflow sponge treatment is formulated appropriately. 1: DNS, 0 5 x1 10 15 Evolution of the centerline velocity u1 (x1 , 0, 0), linear stability theory. 3 Comparison of DNS and LES results Instantaneous results In the following we first compare instantaneous flow data to check how well the overall flow topology of the LES matches the DNS results.

For comparison, also the theoretical growth envelope from inviscid linear stability theory is plotted. The initial linear viscously damped growth of the instability is well represented in DNS and LES, confirming that the inflow sponge treatment is formulated appropriately. 1: DNS, 0 5 x1 10 15 Evolution of the centerline velocity u1 (x1 , 0, 0), linear stability theory. 3 Comparison of DNS and LES results Instantaneous results In the following we first compare instantaneous flow data to check how well the overall flow topology of the LES matches the DNS results.

7) were performed. To prevent temporal mean-flow variation a forcing was introduced that cancels the mean-flow distortion. For small perturbations the result of the modified equation is equivalent to the exact equation for the perturbations. At the lateral boundaries non-reflecting boundary conditions were used. 1. 3 the eigenfunctions are shown for the two cases, where ˆ· denotes the complex eigenfunction for the respective variable. Normalization was achieved such that max(|ˆ u1 |) = 1. For the tests the box size was chosen so that it exactly contained one wavelength of the instability mode.

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