scholarly journals Simulation of free surface flows with non-hydrostatic pressure distribution

Sadhana ◽  
2019 ◽  
Vol 44 (1) ◽  
Author(s):  
Krishna Chandran ◽  
Arun K Saha ◽  
Pranab K Mohapatra
Keyword(s):  
Free Surface ◽  
Hydrostatic Pressure ◽  
Pressure Distribution ◽  
Free Surface Flows ◽  
Surface Flows

A 3-D non-hydrostatic pressure model for small amplitude free surface flows

2006 ◽  
Vol 50 (6) ◽  
pp. 649-672 ◽  
Author(s):  
J. W. Lee ◽  
M. D. Teubner ◽  
J. B. Nixon ◽  
P. M. Gill
Keyword(s):  
Free Surface ◽  
Hydrostatic Pressure ◽  
Small Amplitude ◽  
Free Surface Flows ◽  
Surface Flows

An Improved Moving Particle Semi-Implicit Method for Free Surface Flows

2014 ◽  
Vol 571-572 ◽  
pp. 682-687
Author(s):  
Qiao Rui Wu ◽  
Xiong Liang Yao
Keyword(s):  
Free Surface ◽  
Hydrostatic Pressure ◽  
Large Deformation ◽  
Pressure Oscillation ◽  
Free Surface Flows ◽  
Dam Break ◽  
Implicit Method ◽  
Surface Flows ◽  
Collision Model ◽  
Moving Particle

The objective of this study is to make some improvements to the original Moving Particle Semi-implicit method (MPS) for free surface flows. Compared to traditional mesh methods, MPS is feasible to simulate surface flows with large deformation, however, during the simulation; the pressure oscillation is quite violent, duo to misjudgment of surface particles as well as particles gathering together. To modify this problem, a new arc method is applied to judge free surface particles, and a collision model is introduced to avoid particles from gathering together. Hydrostatic pressure and classical dam break are investigated by original and improved MPS. The results verify that improved MPS method is more effective for free surface flows.

A Semi-Implicit 3-D Numerical Model Using Sigam-Coordinate for Non-Hydrostatic Pressure Free-Surface Flows

2011 ◽  
Vol 23 (2) ◽  
pp. 212-223 ◽  
Author(s):  
De-chao Hu ◽  
Bei-lin Fan ◽  
Guang-qian Wang ◽  
Hong-wu Zhang
Keyword(s):  
Free Surface ◽  
Hydrostatic Pressure ◽  
Numerical Model ◽  
Free Surface Flows ◽  
Surface Flows

scholarly journals On Steady Two-dimensional Free-surface Flows with Spatially-varied Discharges

2019 ◽  
Vol 27 (3) ◽  
pp. 1-11
Author(s):  
Yebegaeshet T. Zerihun
Keyword(s):  
Free Surface ◽  
Hydrostatic Pressure ◽  
Flow Model ◽  
Free Surface Flows ◽  
Main Channel ◽  
Engineering Practice ◽  
Shallow Flow ◽  
Surface Flows ◽  
Averaged Model ◽  
Shallow Flow Model

Abstract In an open-channel, the transition of a flow from a subcritical to a supercritical state may occur as a result of a lateral inflow or outflow that produces a streamwise discharge variation. Apparently, such a transition cannot be modeled accurately by a conventional hydrostatic pressure approach. In this study, a depth-averaged model that accounts for the effects of a spatially-varied discharge and a non-hydrostatic pressure distribution was developed and applied to simulate the transcritical flow in a lateral-spillway channel and the subcritical flow in a main channel fitted with side weirs. The model results for the axial free-surface profile and variation of discharge in the main channel were compared with the results of a shallow-flow model and experimental data, thereby resulting in a closer match to the measurements than the shallow-flow model. Overall, the investigation results confirmed the efficiency and validity of the non-hydrostatic depth-averaged model in simulating the mean flow characteristics of the subcritical and transcritical free-surface flows with spatially increasing or decreasing discharges, thus demonstrating its potential to be used as a numerical tool in engineering practice.

Damped waves generated by a moving pressure distribution

2001 ◽  
Vol 12 (3) ◽  
pp. 357-366 ◽  
Author(s):  
J. -M. VANDEN-BROECK
Keyword(s):  
Free Surface ◽  
Pressure Distribution ◽  
Analytical Solutions ◽  
Lower Layer ◽  
Free Surface Flows ◽  
Two Dimensional ◽  
Surface Flows ◽  
Short Waves

Free surface flows generated by a moving distribution of pressure are considered. The fluid consists of two superposed layers in a two-dimensional channel. The upper layer is inviscid and the lower layer, which is introduced as a damping mechanism, is modelled by the mathematically convenient lubrication equations. Numerical and analytical solutions are presented. Special attention is given to solutions for which there is a train of waves on each side of the distribution of pressure. It is shown that, depending on the values of the parameters, the short waves can appear on either side of the distribution of pressure.

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