The mechanisms by which the flux and production terms act on the mean flow can be examined by conditional sampling of the Reynolds stress [6,23–25]. The method of decomposition consists of binning the velocity fluctuations, *u*_{i}, which are obtained by subtracting the mean velocity *U*_{i} from the instantaneous velocity, $ui\u0303$ as $ui=ui\u0303\u2212Ui$, by their respective signs as shown in Fig. 1. Here, the coordinate system is considered where *u*, *v*, and *w* represent the streamwise, wall-normal, and spanwise fluctuating velocity components, respectively. The stresses are computed for each of these conditions resulting in four types of events, designated as follows: *Q*_{1}, outward interaction; *Q*_{2}, ejection; *Q*_{3}, inward interaction; and *Q*_{4}, sweep.