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CFD Validation Studies of Impulsive Slamming Pressures During Water Entry of a Free-falling Wedge

出版	University of Wyoming, 2019
ISBN	13927412979781392741290
URL	http://books.google.com.hk/books?id=9bBzzQEACAAJ&hl=&source=gbs_api

註釋Impact loads due to slamming are one of the critical design issues for high-speed planing crafts. CFD validation for slamming loads is presented in this work using wedge drop experimental data collected for 10° deadrise angle wedge drops conducted at the Naval Surface Warfare Center, Carderock Division (NSWCCD). The experiment utilizes a rigid wedge structure, and high-frequency pressure data at different locations on the wedge bottom is collected. Uncertainty analyses of the repeated experiments are carried out for the peak pressure values. CFD uncertainties are quantified through systematic time-step verification studies. Validation studies are carried out by comparing the simulation error values with the validation uncertainty intervals defined by combining the experimental and the simulation numerical uncertainties. Validation of the pressure peaks was achieved for both peak pressure magnitude and temporal location of the impulse at all 5 pressure measurement locations, exhibiting an overall average error of only 1.93%. The results from current CFD simulations are then compared with the previous simulations of the same experiments using five different CFD solvers ranging from potential flow to URANS/LES solvers. The current CFD simulation achieved the lowest average error (1.93% compared to study average of 7.29%) and the lowest computational cost (13.5 CPU-HRS compared to study average of 2,532 CPU-HRS) of all the CFD simulations included in the comparative study. Future work will include FSI validation studies against flexible bottom wedge drop experiments.