scholarly journals MATHEMATICAL AND PHYSICAL WAVE DISTURBANCE MODELLING COMPLIMENTARY TOOLS

1986 ◽  
Vol 1 (20) ◽  
pp. 3
Author(s):  
I. Berenguer ◽  
P.A. Madsen ◽  
M. Rubjerg ◽  
A. Kej
Keyword(s):  
Numerical Model ◽  
Mathematical Modelling ◽  
Physical Model ◽  
Wave Disturbance

This paper presents comparisons between physical and numerical model reproductions on the basis of comprehensive wave disturbance studies of a major Spanish port. Mathematical modelling has reached in many cases a degree of reliability comparable to that of a physical model, but it is essential that both types of modelling systems are validated against measurements.

scholarly journals DETERMINATION OF WAVE CREST ELEVATIONS FOR SLAMMING FORCES ON JETTY WITH VERTICAL WALL END

2017 ◽  
pp. 7
Author(s):  
Esin Ozkan Cevik ◽  
Yalcin Yuksel ◽  
Burak Aydogan ◽  
Berna Ayat Aydogan ◽  
Tugce Yuksel
Keyword(s):  
Numerical Model ◽  
Physical Model ◽  
Wave Height ◽  
Vertical Wall ◽  
Wave Disturbance ◽  
Wave Crest ◽  
Shore Protection ◽  
Model Study ◽  
Vertical Walls

Wave disturbance study for a closed end jetty conducted both in laboratory and through a numerical model is presented in this study. Shore protection structures and the structures at the end of the piers are considered for the calculation of the wave disturbance map. The connection locations of the jetties have been designed as vertical walls. These vertical structures and armored waterfront structures would affect the wave behavior in the study area along jetty axis causing reflection of waves and therefore the wave height in front of the structures might increase. This study intends to clarify wave agitation problem by using a numerical model with the help of physical model study.

scholarly journals Effects of Water Intake Layout along the Wharf Shoreline on Ships

2019 ◽  
Vol 26 (4) ◽  
pp. 165-171
Author(s):  
Xian-wei Kong ◽  
Lei Ding ◽  
Hai-cheng Liu ◽  
Jing Qu ◽  
Xiao-song Li
Keyword(s):  
Numerical Model ◽  
Water Level ◽  
Physical Model ◽  
Water Intake ◽  
Hydrodynamic Forces ◽  
Lateral Flow ◽  
Real Situation ◽  
The Real ◽  
Level Difference ◽  
Two Sides

Abstract The construction of a water intake along the wharf shoreline can realise the intensive and comprehensive utilisation of the shoreline. However, since the water intake will increase the lateral flow at the wharf and also the hydrodynamic forces on ships, it will bring risks to ships mooring and leaving. The effects of the water intake on ships are studied using a physical model, numerical model and standard formulas. The results show that it leads to an increase of the hydrodynamic forces acting on the ship when the standard formulas are used to calculate the forces without considering the water level difference between the two sides of the ship. The results of the physical model are closer to the real situation. Measures that can effectively reduce the influence of the water intake on ships are proposed by increasing the distance between the wharf front and the front of the water intake as well as the depth of the water inlet windows.

Simulation of Angular Flow in a Shallow Basin Triggered by a Rotating Vertical Cylinder by SPH Method

2018 ◽  
Vol 881 ◽  
pp. 15-22
Author(s):  
Warniyati ◽  
Radianta Triatmadja ◽  
Nur Yuwono
Keyword(s):  
Numerical Model ◽  
Physical Model ◽  
Time Integration ◽  
Vertical Cylinder ◽  
Shear Velocity ◽  
Future Research ◽  
Sph Method ◽  
Virtual Particle ◽  
Real Particle ◽  
Particle Hydrodynamics

A simple numerical model has been generated for developing a code of Smoothed Particle Hydrodynamics (SPH) method. Those will be modified and used for future research. In this computational research domain is a square that consists of a real particle and virtual particle as the boundary treatment. In the initial condition, particle occupies a certain position. Circular flow has been generated by a rotating vertical cylinder to produce shear velocity to the real particle. The particles movement has been observed during time integration. A physical model has been constructed to compare the numerical model. The movement of real particles on the numerical model agrees with the movement of water particles on the physical model.

scholarly journals Groundwater Flow Modeling in Karst Aquifers: Coupling 3D Matrix and 1D Conduit Flow via Control Volume Isogeometric Analysis—Experimental Verification with a 3D Physical Model

Water ◽  
2018 ◽  
Vol 10 (12) ◽  
pp. 1787 ◽  
Author(s):  
Luka Malenica ◽  
Hrvoje Gotovac ◽  
Grgo Kamber ◽  
Srdjan Simunovic ◽  
Srikanth Allu ◽  
...  
Keyword(s):  
Free Surface ◽  
Numerical Model ◽  
Groundwater Flow ◽  
Physical Model ◽  
Isogeometric Analysis ◽  
Numerical Solutions ◽  
Control Volume ◽  
Karst Aquifers ◽  
Conduit Flow ◽  
Laboratory Conditions

A novel numerical model for groundwater flow in karst aquifers is presented. A discrete-continuum (hybrid) approach, in which a three-dimensional matrix flow is coupled with a one-dimensional conduit flow, was used. The laminar flow in the karst matrix is described by a variably saturated flow equation to account for important hydrodynamic effects in both the saturated and unsaturated zones. Turbulent conduit flow for both free surface and pressurized flow conditions was captured via the noninertia wave equation, whereas the coupling of two flow domains was established through an exchange term proportional to head differences. The novel numerical approach based on Fup basis functions and control-volume formulation enabled us to obtain smooth and locally conservative numerical solutions. Due to its similarity to the isogeometric analysis concept (IGA), we labeled it as control-volume isogeometric analysis (CV-IGA). Since realistic verification of the karst flow models is an extremely difficult task, the particular contribution of this work is the construction of a specially designed 3D physical model ( dimensions: 5.66 × 2.95 × 2.00 m) in order to verify the developed numerical model under controlled laboratory conditions. Heterogeneous porous material was used to simulate the karst matrix, and perforated pipes were used as karst conduits. The model was able to capture many flow characteristics, such as the interaction between the matrix and conduit, rainfall infiltration through the unsaturated zone, direct recharge through sinkholes, and both free surface and pressurized flow in conduits. Two different flow experiments are presented, and comparison with numerical results confirmed the validity of the developed karst flow model under complex laboratory conditions.

scholarly journals NUMERICAL SIMULATION STUDY ON DEPOSITION DOWNSTREAM ESTUARINE SLUICE

2012 ◽  
Vol 1 (33) ◽  
pp. 8 ◽  
Author(s):  
Xiping Dou ◽  
Xinzhou Zhang ◽  
Xiangming Wang ◽  
Jinhua Wang
Keyword(s):  
Numerical Simulation ◽  
Numerical Model ◽  
Physical Model ◽  
Feasibility Study ◽  
Simulation Study ◽  
Salt Intrusion ◽  
3D Numerical Model ◽  
2D Numerical Model

In order to resist tides and salt intrusion, there have been more than 300 tidal gates built at many river estuaries in China since 1960s. However, the serious deposition occurred at a lot of gates due to the changes of hydrodynamic and sediment conditions and lack of discharge from the rivers. At present, the research is mainly to analyze the reasons for siltation downstream gates and the measures of dredging. It is not enough for study on distribution simulation of deposition downstream sluice. Studies have shown that 2D numerical model cannot reflect the distribution of sediment siltation downstream gates. Therefore, it needs to develop 3D sediment numerical model for deposition prediction. In this paper, combined the feasibility study of a tidal gate at Mulanxi River, a physical model and 3D numerical model of sediment siltation downstream gate are conducted.

scholarly journals Roof Subsidence and Movement Law of Composite Strata Mining: Insights from Physical and Numerical Modeling

Minerals ◽  
2021 ◽  
Vol 12 (1) ◽  
pp. 3
Author(s):  
Yongqian Wang ◽  
Xuan Wang ◽  
Jiasheng Zhang ◽  
Xiaobin Chen ◽  
Wujun Zhu ◽  
...  
Keyword(s):  
Numerical Model ◽  
Physical Model ◽  
Surface Subsidence ◽  
Similarity Criteria ◽  
Theoretical Formula ◽  
Constant Field ◽  
Rock Formations ◽  
Movement Characteristics ◽  
Similar Materials ◽  
Dip Angle

Sinking and horizontal movements are necessary parameters for assessing the potential impacts of surface subsidence in mining activities. Based on similarity criteria, the surface subsidence mechanism was studied using a physical model composed of similar materials such as sand, cement, and gypsum. With constant field geological parameters maintained in two angles of a coal seam, models of roof subsidence of composite rock were compared for different mining configurations. In accordance with observations from the physical model, it was concluded that subsidence and horizontal movement of strata near to and far from the coal seams were different and divided into five zones. The zone above a mined-out area underwent greater total subsidence compared to unexploited regions on both sides. Correlations between a subsidence curve and the height of a caving zone and the mining dip angle were obtained and verified from numerical model results. According to the roof’s position relative to the goaf, the area above the goaf of the composite rock layer was divided into three regions: a curving zone, a water-conducting fracture zone, and a falling zone, to which the subsidence and movement characteristics of each area could be proposed. Compared with the subsidence and movement characteristics observed from the physical and numerical model, the acquisition of subsidence characteristics and parameters in different areas can provide an idea for improvement, innovation or proposal of a theoretical formula for subsidence prediction of composite rock formations.

scholarly journals Numerical Modeling of Equal and Differentiated Gas Injection in Ladles: Effect on Mixing Time and Slag Eye

Processes ◽  
2020 ◽  
Vol 8 (8) ◽  
pp. 917
Author(s):  
Luis E. Jardón-Pérez ◽  
Carlos González-Rivera ◽  
Marco A. Ramirez-Argaez ◽  
Abhishek Dutta
Keyword(s):  
Numerical Modeling ◽  
Numerical Model ◽  
Physical Model ◽  
Flow Rate ◽  
Gas Flow ◽  
Mixing Time ◽  
Gas Injection ◽  
Steel Slag ◽  
Gas Flow Rate ◽  
Slag Thickness

Ladle refining plays a crucial role in the steelmaking process, in which a gas stream is bubbled through molten steel to improve the rate of removal of impurities and enhance the transport phenomena that occur in a metallurgical reactor. In this study, the effect of dual gas injection using equal (50%:50%) and differentiated (75%:25%) flows was studied through numerical modeling, using computational fluid dynamics (CFD). The effect of gas flow rate and slag thickness on mixing time and slag eye area were studied numerically and compared with the physical model. The numerical model agrees with the physical model, showing that for optimal performance the ladle must be operated using differentiated flows. Although the numerical model can predict well the hydrodynamic behavior (velocity and turbulent kinetic energy) of the ladle, there is a deviation from the experimental mixing time when using both equal and differentiated gas injection at a high gas flow rate and a high slag thickness. This is probably due to the insufficient capture of the velocity field near the water–oil (steel–slag) interface and slag emulsification by the numerical model, as well as the complicated nature of correctly simulating the interaction between both gas plumes.

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