Improvement of the fluctuating pressure empirical functions for a body of revolution at transonic mach numbers

The transonic buffet environment around a generic rocket fairing has been numerically investigated by the large-eddy simulation (LES) method. It is found that the flow structures generating the fluctuating wall pressure vary temporally and spatially, and also interact with each other. In particular, serious buffet environment could also be induced by the expansion fan, where significant flow acceleration and deceleration occur. Accordingly, the flow regions are redefined, and the corresponding empirical functions are proposed. By introducing the spatially-correlated corrections, the accuracy of the modified functions are remarkably improved, especially at the locations after the separation bubble.