When the streamwise fine-scale structures appear in a simulated compressible wake, corresponding to the saturation of oblique modes, the predominance of points collects in an elliptical region about the origin with its major axis aligned with upper left and lower right quadrants in the Q-R space. Significant number of plots is described by the evolution equations of the velocity gradient tensor with a homogeneous model of compressible turbulence. Points far from the origin tend to be associated with relatively large rates of the right hand sides of the evolution equations.
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