Numerical investigation of pressure gradient effect on wall-pressure fluctuations
Ng, Kok Chian
AdvisorHoffmann, Klaus A.
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This research investigates the effect of pressure gradient on wall-pressure fluctuations in turbulent boundary layers using a delayed detached eddy simulation (DDES) turbulence scheme. The results are compared to Goody's and Efimtsov's empirical single-point wall-pressure spectrum models. Three different types of pressure gradient conditions were investigated numerically: zero pressure gradient (Flat Plate as a baseline model), favorable pressure gradient (Convex 10 , 20 , and 40 Plates), and adverse pressure gradient (Concave 10 , 20 , and 40 Plates). The numerical results were subsequently compared with each other. For the zero pressure gradient case, results compared well with empirical solutions. It was observed that, for cases with adverse pressure gradients, the pressure fluctuations were more chaotic than for the favorable pressure gradient models. In contrast, the favorable pressure gradient models induced lower frequency noise relative to adverse pressure gradient models.
Thesis (M.S.)--Wichita State University, College of Engineering, Dept. of Aerospace Engineering