Theory of nonstationary interaction between pressure waves in a fluid and unclosed surfaces

1986 ◽  
Vol 20 (6) ◽  
pp. 906-912
Author(s):  
V. V. Dykhta
Keyword(s):  
Pressure Waves ◽  
Nonstationary Interaction

Application of LMS Imagine.Lab Amesim Package for Simulation the Propagation of Pressure Waves Liquid in Pipeline

2017 ◽  
Vol 14 (4) ◽  
pp. 78-90
Author(s):  
K.N. Proskuryakov ◽  
A.I. Fedorov ◽  
M.V. Zaporozhets
Keyword(s):  
Pressure Waves

Effects of Interface Configurations on Pressure Waves in Guns

1988 ◽  
Author(s):  
Carl R. Ruth ◽  
James W. Evans ◽  
James E. Bowen ◽  
John R. Hewitt
Keyword(s):  
Pressure Waves

Effects of detailed shape of air-shaft entrance hood on tunnel pressure waves

2021 ◽  
Vol 35 (2) ◽  
pp. 615-624
Author(s):  
Dong Hyeon Kim ◽  
Yong Cheol Seo ◽  
Tae Ho Kim ◽  
Heuy Dong Kim
Keyword(s):  
Pressure Waves

Pressure Waves in Microscopic Simulations of Laser Ablation Leonid

1998 ◽  
Vol 538 ◽  
Author(s):  
V. Zhigilei ◽  
Barbara J. Garrison
Keyword(s):  
Boundary Condition ◽  
Laser Ablation ◽  
Laser Energy ◽  
Scale Up ◽  
Boundary Region ◽  
Dynamics Simulation ◽  
Pressure Waves ◽  
Absorption Region ◽  
Organic Solids ◽  
Direct Laser

AbstractLaser ablation of organic solids is a complex collective phenomenon that includes processes occurring at different length and time scales. A mesoscopic breathing sphere model developed recently for molecular dynamics simulation of laser ablation and damage of organic solids has significantly expanded the length-scale (up to hundreds of nanometers) and the time-scale (up to nanoseconds) of the simulations. The laser induced buildup of a high pressure within the absorbing volume and generation of the pressure waves propagating from the absorption region poses an additional challenge for molecular-level simulation. A new dynamic boundary condition is developed to minimize the effects of the reflection of the wave from the boundary of the computational cell. The boundary condition accounts for the laser induced pressure wave propagation as well as the direct laser energy deposition in the boundary region.

Resonance in a mathematical model of baroreflex control: arterial blood pressure waves accompanying postural stress

2005 ◽  
Vol 288 (6) ◽  
pp. R1637-R1648 ◽  
Author(s):  
Peter E. Hammer ◽  
J. Philip Saul
Keyword(s):  
Blood Pressure ◽  
Mathematical Model ◽  
Blood Volume ◽  
Low Frequency ◽  
Pressure Waves ◽  
Central Blood Volume ◽  
Arterial Baroreflex ◽  
Arterial Blood ◽  
Gain Margin ◽  
The Stability

A mathematical model of the arterial baroreflex was developed and used to assess the stability of the reflex and its potential role in producing the low-frequency arterial blood pressure oscillations called Mayer waves that are commonly seen in humans and animals in response to decreased central blood volume. The model consists of an arrangement of discrete-time filters derived from published physiological studies, which is reduced to a numerical expression for the baroreflex open-loop frequency response. Model stability was assessed for two states: normal and decreased central blood volume. The state of decreased central blood volume was simulated by decreasing baroreflex parasympathetic heart rate gain and by increasing baroreflex sympathetic vaso/venomotor gains as occurs with the unloading of cardiopulmonary baroreceptors. For the normal state, the feedback system was stable by the Nyquist criterion (gain margin = 0.6), but in the hypovolemic state, the gain margin was small (0.07), and the closed-loop frequency response exhibited a sharp peak (gain of 11) at 0.07 Hz, the same frequency as that observed for arterial pressure fluctuations in a group of healthy standing subjects. These findings support the theory that stresses affecting central blood volume, including upright posture, can reduce the stability of the normally stable arterial baroreflex feedback, leading to resonance and low-frequency blood pressure waves.

scholarly journals Aquifer imaging with pressure waves-Evaluation of low-impact characterization through sandbox experiments

2016 ◽  
Vol 52 (3) ◽  
pp. 2141-2156 ◽  
Author(s):  
YaoQuan Zhou ◽  
David Lim ◽  
Fausto Cupola ◽  
Michael Cardiff
Keyword(s):  
Pressure Waves ◽  
Sandbox Experiments
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