Unsteady Effects of Shock Wave Induced Separation by Piotr Doerffer, Charles Hirsch, Jean-Paul Dussauge, Holger

By Piotr Doerffer, Charles Hirsch, Jean-Paul Dussauge, Holger Babinsky, George N. Barakos

This quantity comprises description of experimental and numerical effects received within the UFAST venture. The aim of the venture used to be to generate test facts financial institution delivering unsteady features of the surprise boundary layer interplay. This new info financial institution will be valuable for larger knowing of the actual phenomena concerned. The experiments involved uncomplicated reference instances and the circumstances with software of circulation keep watch over units. The units have been freely selected via study teams, counting on their event. got new info financial institution used to be used for the comparability with on hand simulation concepts, ranging from RANS, via URANS and LES. major attempt was once additionally targeting hybrid RANS-LES tools.

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28 Example of synthetic jet actuator employed for preliminary computations The parameters initially varied were the amplitude and frequency of the oscillation of the deforming surface below the plenum. These calculations employed deforming grids and were quite demanding due to the large number of parameters that had to be set. The grid deformation method in the Parallel Multi-Block solver of Liverpool is based on the Trans-Finite Interpolation (TFI) and performed well for this case. 8 Flow Control Attempts 37 It was found, that at the flow conditions upstream the shock, actuation frequencies about 100 Hz were necessary in order to form vortices that persist downstream the actuator.

45 Time histories for point 47 (interaction region) for the pressure (top left), kinetic energy of turbulence (top right), RMS pressure (bottom left) and RMS of spanwise velocity(bottom right). Results were obtained using the OES approach. 50 2 Bump at a Wall (George Barakos) Fig. 46 k-ε OES results of IMFT showing pressure signals and FFTs at two locations over the bump. A frequency of about 250 Hz is shown in the spectra. 10 51 Summary and Suggestions for Future Work The work carried out by ULIV for this project represents 12 person-months of effort.

2. As can be seen, two configurations were considered with porous and contoured upper walls. All meshes had side walls and provided local refinement near the shock/boundary layer interaction region. 9 and the streamwise and spanwise spacings in the near-bump region were of the order of Δx+ and Δy + of 10 for the finest of the meshes. 9M X A simple multi-block topology was used since the geometry was smooth and the number of the employed blocks was increased to allow for parallel execution on about 64 processors with load differences of less than 5% between the CPUs.

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