scholarly journals QUASI TWO-DIMENSIONAL NUMERICAL MODEL FOR FREE-SURFACE-PRESSURIZED FLOWS

2015 ◽  
Vol 71 (4) ◽  
pp. I_571-I_576
Author(s):  
Mirei SHIGE-EDA ◽  
Juichiro AKIYAMA ◽  
Yu KAWAKAMI
Keyword(s):  
Free Surface ◽  
Numerical Model ◽  
Two Dimensional ◽  
Pressurized Flows

scholarly journals Numerical modeling of fluid resonance in narrow gaps of fixed rectangular structures

2019 ◽  
Vol 11 (8) ◽  
pp. 168781401987230
Author(s):  
Ming-ming Liu ◽  
Rui-jia Jin ◽  
Zhen-dong Cui
Keyword(s):  
Free Surface ◽  
Numerical Model ◽  
Stokes Equations ◽  
Theoretical Data ◽  
Numerical Results ◽  
Two Dimensional ◽  
Arbitrary Lagrangian Eulerian ◽  
Fluid Resonance ◽  
Resonance Wave ◽  
Narrow Gaps

A two-dimensional numerical model is developed to investigate the phenomenon of resonance in narrow gaps. Instead of using commonly used Volume of Fluid method to capture the free surface which is sometimes difficult to capture the geometric properties of the geometrically complicated interface, the free surface is traced by using Arbitrary Lagrangian–Eulerian method. The numerical model is based on the two-dimensional Reynolds-Averaged Navier–Stokes equations. The numerical model is validated against wave propagation in wave flume. Comparisons between the numerical results and available theoretical data show satisfactory agreements. Fluid resonance in narrow gaps of fixed rectangular structures are simulated. Numerical results show that resonance wave height and wave frequency for rectangle boxes with sphenoid corners is larger than for rectangle boxes.

scholarly journals Two-dimensional free surface flow numerical model for vertical slot fishways

2010 ◽  
Vol 48 (2) ◽  
pp. 141-151 ◽  
Author(s):  
Jacques Chorda ◽  
Marie Madeleine Maubourguet ◽  
Hélène Roux ◽  
Michel Larinier ◽  
Laurent Tarrade ◽  
...  
Keyword(s):  
Free Surface ◽  
Numerical Model ◽  
Free Surface Flow ◽  
Surface Flow ◽  
Two Dimensional ◽  
Vertical Slot

Effects of Water Temperature on Clinging Flow of Rectangular Sharp-Crested Weir

2012 ◽  
Vol 212-213 ◽  
pp. 1151-1154
Author(s):  
Yan Jun Ji ◽  
Xin Zhang ◽  
Hai Feng Zhai ◽  
Dong Yang Ren ◽  
Ling Hua
Keyword(s):  
Surface Tension ◽  
Free Surface ◽  
Numerical Model ◽  
Water Temperature ◽  
Discharge Capacity ◽  
Flow Rate ◽  
Two Dimensional ◽  
Effect Of Water ◽  
Low Head ◽  
Temperature Levels

Surface tension associated with temperature is usually considered non-negligible to affect discharge capacity of sharp-crested weir when head is low. In the study, a two-dimensional numerical model verified by experiments was applied to simulate the effect of water temperature on discharge capacity of clinging flow for a rectangular sharp-crested weir at low head levels. The results showed that with a same flow rate, differences in the elevation of free surface were minimal between different temperature levels despite a slightly higher elevation of free surface at lower water temperature. The head-discharge relationships were very similar for different temperature levels. This study concluded that the effect of water temperature on head-discharge relationships and the discharge capacity of clinging flow for a rectangular sharp-crested weir was negligible at low heads.

Investigation of two-dimensional nonstationary processes of outflow a gas-saturated liquid from axisymmetric vessels

2012 ◽  
Vol 9 (1) ◽  
pp. 47-52
Author(s):  
R.Kh. Bolotnova ◽  
V.A. Buzina
Keyword(s):  
Comparative Analysis ◽  
Numerical Model ◽  
Liquid Mixture ◽  
Phase Model ◽  
Test Problems ◽  
Two Dimensional ◽  
Nonstationary Processes ◽  
Saturated Liquid ◽  
Two Phase ◽  
One Dimensional

The two-dimensional and two-phase model of the gas-liquid mixture is constructed. The validity of numerical model realization is justified by using a comparative analysis of test problems solution with one-dimensional calculations. The regularities of gas-saturated liquid outflow from axisymmetric vessels for different geometries are established.

An implicit scheme for simulation of free surface non-Newtonian fluid flows on dynamically adapted grids

2021 ◽  
Vol 36 (3) ◽  
pp. 165-176
Author(s):  
Kirill Nikitin ◽  
Yuri Vassilevski ◽  
Ruslan Yanbarisov
Keyword(s):  
Free Surface ◽  
Numerical Model ◽  
Newtonian Fluid ◽  
Viscoelastic Fluid ◽  
Fluid Flows ◽  
Numerical Results ◽  
Implicit Scheme ◽  
New Approach

Abstract This work presents a new approach to modelling of free surface non-Newtonian (viscoplastic or viscoelastic) fluid flows on dynamically adapted octree grids. The numerical model is based on the implicit formulation and the staggered location of governing variables. We verify our model by comparing simulations with experimental and numerical results known from the literature.

scholarly journals Influence of the North Branch of the Qingshuigou River on the Lower Reaches of Yellow River Based on Two-dimensional Numerical Model

2021 ◽  
Vol 1885 (2) ◽  
pp. 022043
Author(s):  
Caodong Jiang ◽  
Liangchao Ma ◽  
Dongfeng Li ◽  
Hongwu Zhang ◽  
Zihao Li
Keyword(s):  
Numerical Model ◽  
Yellow River ◽  
Two Dimensional ◽  
The North
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