Both complex and real eigenvectors are employed, including the real-valued dual-eigenvectors representing the orthogonal elongated directions in the swirl plane. The proposed quantities are applied to an impulsively started incompressible flow around an inclined flat plate....
A secondary vortex rotating about a high-swirl primary vortex or the spiral vortex sometimes encountered within the vortex breakdown in a low-swirl corner flow both provide important examples of vortices that gradually weaken aloft without themselves necessarily undergoing a vortex breakdown. We have ...
Given that helical modes often have the largest amplitudes in jet flows, particularly those with swirl, these results show that the degree of non-axisymmetry of the flame has an important influence in determining which hydrodynamic modes, axisymmetric or helical, control the global heat release ...