Topic
Overpressure
About: Overpressure is a research topic. Over the lifetime, 3236 publications have been published within this topic receiving 34648 citations.
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TL;DR: In this article, a 2D basin modeling technique was used to identify the development of excess pore pressure derived from gas generation through time, which was determined with a numerical model.
12 citations
14 Aug 2000
TL;DR: In this article, a computational fluid dynamic (CFD) simulation procedure for prediction of transient engine exhaust plume flowfield effects acting on Delta II and Delta III launch vehicles before liftoff is described.
Abstract: This paper describes a computational fluid dynamic (CFD) simulation procedure for prediction of transient engine exhaust plume flowfield effects acting on Delta II and Delta III launch vehicles before liftoff. Transient vehicle forces, pressures, temperatures, and plume concentrations are predicted for use in analyses of main engine nozzle and launch-leg clearance, base pressure environments, and plume contamination. Ignition overpressure (IOP) effects produced by unsteady exhaust plume flowfields are simulated for Delta II and Delta III launch vehicles on Pad 17B at Cape Canaveral Air Force Station (CCAFS). CFD results predict that the Pad 17B J-deflector, horizontal exhaust duct, and louver exhaust essentially induce either an uprangeor downrange-directed lateral force. This result is in agreement with observed Delta II 7295-9.5 Skynet main engine gimbal angles at liftoff.
12 citations
TL;DR: In this article, a compaction model coupled with both mechanical and chemical compaction for smectite-rich sediments is used for pore pressure calibration, and the results provide a basis for planning future wells in the Joetsu Basin.
12 citations
01 May 1986
TL;DR: In this article, the authors investigated the characteristic exhaust decay time for the energy efflux at the jet exit as a possible additional significant parameter that might be used to improve predictions for the impulse.
Abstract: : Until now, the peak energy efflux at the jet exit was considered the significant parameter in a scaling approach to estimate the peak overpressure, time of arrival, and positive phase duration from guns and shock tubes. The resulting predictions for the peak overpressure, time of arrival were satisfactory but the positive phase duration prediction was poor. This predicted value of the positive phase duration is used with the peak overpressue prediction to obtain an estimate of an important quantity: the impulse. Here we investigate the characteristic exhaust decay time for the energy efflux at the jet exit as a possible additional significant parameter that might be used to improve predictions for the impulse. Numerical simulation was used to establish that the impulse value depends upon this parameter. Comparison between simulation and experiment is satisfactory. This additional parameter wa sused to correlate the available impulse data. It was determined that the additional parameter significantly improves the prediction capability of the scaling method for predicting impulse. An idealized wave form together with the predicted peak overpressure can be used to obtain an estimate of the positive phase duration. This approach yields less satisfactory agreement with the duration data but this fact is relatively unimportant since the impulse is the quantity of importance. Keywords: Gun muzzle blast; Shock waves; Blast wave scaling; Dimensional analysis.
12 citations
11 Mar 2013
12 citations