Numerical simulation for runoff regulation in rain garden using 2D hydrodynamic Model

2020 ◽  
Vol 153 ◽  
pp. 105794 ◽  
Author(s):  
Jingming Hou ◽  
Feifei Liu ◽  
Yu Tong ◽  
Kaihua Guo ◽  
Liping Ma ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
Hydrodynamic Model ◽  
Rain Garden ◽  
Runoff Regulation

Numerical Modeling of Oil Spill with Tidal and Wind-Driven Coupled Model in Bohai Bay

2013 ◽  
Vol 423-426 ◽  
pp. 1394-1397
Author(s):  
Ming Chang Li ◽  
Guang Yu Zhang ◽  
Qi Si ◽  
Shu Xiu Liang ◽  
Zhao Chen Sun
Keyword(s):  
Numerical Simulation ◽  
Numerical Modeling ◽  
Oil Spill ◽  
Hydrodynamic Model ◽  
Field Data ◽  
Coupled Model ◽  
Bohai Bay ◽  
Trajectory Simulation ◽  
Simulation Results

Based on the hydrodynamic model and wind field data, a multi-module coupled oil spill model is constructed for simulating the trajectory of oil movement. A case study is researched in Bohai Bay. The model works well and the numerical simulation results show the model is suitable for oil spill trajectory simulation. Two cases are considered with and without wind to show its important influence for the oil spill.

A novel two-lane lattice hydrodynamic model on a gradient road considering heterogeneous traffic flow

2021 ◽  
pp. 2150340
Author(s):  
Huimin Liu ◽  
Rongjun Cheng ◽  
Hongxia Ge
Keyword(s):  
Numerical Simulation ◽  
Traffic Flow ◽  
Linear Stability ◽  
Hydrodynamic Model ◽  
Heterogeneous Traffic ◽  
Maximum Speed ◽  
Lattice Hydrodynamic Model ◽  
Different Types ◽  
Traffic Flow Stability ◽  
The Stability

In the actual traffic, there are not only cars, but also buses, trucks and other vehicles. These vehicles with different maximum speeds or security headway or both are interspersed irregularly to form a heterogeneous traffic flow. In addition, most of the maximum speed of modern cars is hardly affected by gradients due to the fact that the car engine and brakes are rarely operated at their max while the maximum speed of trucks is affected. Considering that the performance of various types of vehicles is multifarious and the vehicles sometimes drive on the road with slopes, a novel two-lane lattice hydrodynamic model on a gradient road considering heterogeneous traffic flow is proposed in this paper. In order to verify the rationality of the model, the linear stability analysis is carried out first, that is, the linear stability conditions are derived from the linear stability theory and the stability curve is drawn accordingly. The results of the above analysis prove that the three factors studied in this paper, namely, time lane change, slope and mixing of different types of vehicles, all have a significant influence on the stability of traffic flow. The modified Korteweg–de Vries (mKdV) equation is deduced by the nonlinear analysis method, which can describe the propagation characteristics of the traffic density waves near the critical point. Last but not least, the numerical simulation for new model is conducted and the numerical simulation results obtained are in good agreement with theoretical ones. In summary, increasing the lane changing rate or the slope on the uphill can improve the traffic flow stability. What is more, increasing the slope can lower the traffic flow stability on the downhill. Finally, in the heterogeneous traffic flow of different types of vehicles, the vehicles with larger security headway will make traffic flow difficult to stabilize, as do the vehicles with larger maximum speed.

Trajectory and Attitude Control of an Underwater Towed Vehicle

2006 ◽  
Author(s):  
Jiaming Wu ◽  
Xuefeng Jin
Keyword(s):  
Numerical Simulation ◽  
Hydrodynamic Model ◽  
Attitude Control ◽  
Fuzzy Controller ◽  
Hydrodynamic Performance ◽  
Control Technique ◽  
Main Body ◽  
Time Step ◽  
Vehicle Simulation ◽  
Control Surfaces

A new concept of control technique to perform operation of trajectory maneuvering to a controllable underwater towed vehicle moving in a designated path with a required attitude is presented. A trajectory and attitude control technique for the towed vehicle is proposed in order to accomplish the vehicle’s trajectory and attitude manipulations. This technique is based on a fuzzy algorithm. The towed vehicle in the research consists of a cylindrical main body equipped with several active horizontal and vertical control surfaces. Numerical simulation on the hydrodynamic and control behavior of the towed vehicle under this control manipulation is conducted based on a fully 3-D hydrodynamic model of an underwater towed vehicle. In the model the governing equation of the towed cable is based on the Ablow and Schechter method. The six-degrees-of-freedom equations of motion for an underwater vehicle simulation proposed by Gertler and Hagen are adopted to estimate the hydrodynamic performance of the towed vehicle. In numerical simulation the deflections of vehicle’s control surfaces are governed by the proposed fuzzy controller to manipulate the vehicle traveling along a 3-D stipulated trajectory configuration and required attitude. The values of the deflections are taken as input parameters for the hydrodynamic model at every time step. The performance of the towed vehicle under different designated trajectory and attitude control manipulations can then be investigated with the hydrodynamic model.

NUMERICAL SIMULATION OF THE ACOUSTIC RESPONSE OF A HYDRODYNAMIC MODEL OF THE LABYRINTH SPACES

2012 ◽  
Vol 45 ◽  
pp. S184
Author(s):  
Antonio Garcia-Gonzalez ◽  
Luis Caminos ◽  
Antonio Gonzalez-Herrera ◽  
Rafael Urquiza de la Rosa
Keyword(s):  
Numerical Simulation ◽  
Hydrodynamic Model ◽  
Acoustic Response

Numerical Simulation Study of Soluble and Conservative Liquid Chemicals Diffusion in Tidal River

2013 ◽  
Vol 864-867 ◽  
pp. 1427-1432
Author(s):  
Jian Wei Zhang ◽  
Wan Qing Wu
Keyword(s):  
Numerical Simulation ◽  
Simulation Study ◽  
Hydrodynamic Model ◽  
Moving Boundary ◽  
Transport Model ◽  
Three Dimensional ◽  
Concentration Field ◽  
Pollutant Transport ◽  
Tidal River ◽  
Simulation Results

Based on three-dimensional hydrodynamic model, moving boundary technique and embedded pollutant transport model, the concentration field of the soluble and conservative liquid chemicals spilled into the tidal river was calculated and the chemicals movement around a jetty at DA Liaohe was simulated. By analyzing the simulation results, the chemicals motion law with tide and their concentration field on and in water were deduced.

scholarly journals Research on Numerical Modelling in Lake Dynamics

2019 ◽  
Vol 8 (9S2) ◽  
pp. 496-498
Keyword(s):  
Numerical Simulation ◽  
Coriolis Force ◽  
Lake Water ◽  
Hydrodynamic Model ◽  
Bottom Topography ◽  
Vertical Mixing ◽  
Boussinesq Approximation ◽  
Strong Wind ◽  
Large Lakes ◽  
Lake Dynamics

Lakes are natural water bodies, where flow from single or various rivers is impounded by a natural impediment. Lake water environmental problem has severe effect on human health and the socio-economic sustainable development. So, it’s very important to find the more effective way of controlling the water pollution. Dynamics of lakes is the vast topic, which includes important concepts such as circulation of lakes, pollutant transport and interaction between lakes and hydrology. The hydrological dynamics of lake has been influenced by land cover modification, climate change, and increase in population and development activities within the catchment. Due to less velocity, lake impounds water for some time, and a significant characteristic of a lake is its retention time. Wind is the prevalent force in driving the circulation and in developing turbulent mixing in the lakes. Vertical mixing is caused by this turbulence. During circulation, summer and winter has different wind patterns. Strong wind would cause storm surge, which results in increased, mixing and transport in the surface water systems. Air temperature influence surface waters through heat flux and evaporation exchange between the air and the water. The Coriolis force is certain in large lakes due to earth rotation. Precipitation, tributaries inflow, runoffs, etc are lake water inputs. During numerical simulation of lakes, generally Boussinesq approximation and hydrostatic approximation are considered due to actual density distribution variations in water depth concepts respectively. It is essential to calibrate and verify the model before predictive applications anywhere. A simple numerical hydrodynamic model of a lake includes wind stress, bottom friction, Coriolis force, inflow, outflow, and the bottom topography of the lake. The hydrodynamic model has to be tested for stability, convergence, and sensitivity to parameters such as wind shear, wind direction, and vertical eddy viscosity effects. In this paper, the numerical simulation of lake dynamics has been discussed in detail

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