author = "Manco, Jhonatan Andr{\'e}s Aguirre and Freitas, Romulo B. and 
                         Fernando, Leandro M. and Mendon{\c{c}}a, Marcio T.",
          affiliation = "{Instituto Nacional de Pesquisas Espaciais (INPE)} and {Instituto 
                         de Aeron{\'a}utica e Espa{\c{c}}o (IAE)} and {Instituto de 
                         Aeron{\'a}utica e Espa{\c{c}}o (IAE)} and {Instituto de 
                         Aeron{\'a}utica e Espa{\c{c}}o (IAE)}",
                title = "Stability of compressible mixing layers modified by wakes and 
              journal = "Procedia IUTAM",
                 year = "2015",
               volume = "14",
                pages = "129--136",
             keywords = "linear stability analysis, binary free shear layers, direct 
                         numerical simulation.",
             abstract = "Binary free shear layers are frequently used as a model to study 
                         the stability of flows relevant in propulsion devices. The 
                         stability behaviour of binary, compressible mixing layer have been 
                         investigated and reported in the literature by many research 
                         groups and detailed description of the stability characteristics 
                         and flow topology have been published. The stability of more 
                         complex free shear layers, such as mixing layers modified by jets 
                         and wakes, has received less attention and a smaller number of 
                         references report on the stability characteristics of such flows. 
                         The availability of advanced numerical techniques as well as 
                         computational power nowadays allow the study of complex flows by 
                         direct numerical simulation. The present investigation is an 
                         extension of previous work on the stability of complex free shear 
                         flows where besides growth rates, wave numbers and frequencies, 
                         the flow topology resulting from the interaction of mixing layers, 
                         jets and wakes are investigated. The results show that, depending 
                         on the jet or wake strength relative to the mixing layer fast and 
                         slow stream velocities, the characteristic Kelvin-Helmholtz 
                         vortices may be enhanced and a more complex vortex distribution 
                         topology results. These vorticity distributions have a significant 
                         effect on the mixture between different species on the upper and 
                         lower stream and the mixing layer to jet species ratio. The effect 
                         of three-dimensional disturbances with spanwise wavenumber 
                         \β * 0 are also considered and the most amplified modes are 
                         determined for a low convective mach number condition. Different 
                         combinations of hydrogen and oxygen on the mixing layer and jets 
                         are considered. For that study the base flow is determined from a 
                         parabolic, variable properties boundary layer code. The results 
                         show that oblique disturbances are more stable than 
                         two-dimensional disturbances but with different strength depending 
                         on the particular binary free shear layer considered.",
                  doi = "10.1016/j.piutam.2015.03.032",
                  url = "http://dx.doi.org/10.1016/j.piutam.2015.03.032",
                 issn = "2210-9838",
             language = "en",
        urlaccessdate = "04 dez. 2020"