Flow confluence calculation method in complex underlying surface condition of city

A computational method, complex technology, applied in computing, special data processing applications, instruments, etc., capable of solving problems such as flow mechanisms or complex boundary conditions

Inactive Publication Date: 2016-08-10
CHINA INST OF WATER RESOURCES & HYDROPOWER RES +1
View PDF2 Cites 3 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it is undeniable that there are still challenges in describing fluid motion at the macro level: ① For some complex situations, such as turbulent flow, porous medium flow, and cross-scale flow, macroscopic models have great limitations due to the complexity of flow mechanisms or boundary conditions
② For strongly nonlinear differential equations, numerical stability is a big problem
Among them, the proposal of the Lattice BGK

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Flow confluence calculation method in complex underlying surface condition of city
  • Flow confluence calculation method in complex underlying surface condition of city
  • Flow confluence calculation method in complex underlying surface condition of city

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0077] The present invention will be further described below.

[0078] Example: In the State Key Laboratory of Soil Erosion and Dryland Agriculture in the Loess Plateau of Northwest Agriculture and Forestry University, three variable slope experimental tanks were constructed. The length, width and height of each experimental tank were divided into 2m, 0.55m and 0.3m. In the experimental tank, there are three outlets for surface runoff, soil outflow and underground runoff. The three runoff outlet positions are respectively set at 0.35, 0.175 and 0 cm from the bottom of the tank. The lower end of the experimental tank is equipped with a "V"-shaped flow collecting device for collecting runoff samples regularly.

[0079] The soil sample is heavy loam, which was taken from the experimental field in Yangling, Shaanxi Province, and the soil sampling method was adopted in layers. After filling the soil in layers, cover the surface of the soil tank with a plastic film to prevent fore...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

The invention discloses a flow confluence calculation method in a complex underlying surface condition of a city. The method comprises following steps of: step 1, constructing a kinematic wave equation describing an overland flow motion and setting initial conditions and boundary conditions; step 2, constructing an evolution equation on the basis of a discrete velocity model; step 3, processing and calculating multi-scale problems of the Lattice Boltzmann method; step 4, determining an equilibrium state distribution function; step 5, processing the initial conditions and the boundary conditions; and step 6, solving an overland flow motion equation through the improved Lattice Boltzmann method. Compared with the prior art, the flow confluence calculation method can be applied for solving the overland flow motion equation, and by means of the processing method of the multi-scale problems, solving precision of the overland flow motion equation is effectively improved, and problems of increasing complexity of the underlying surface terrains and covering features of a drainage basin in a background of acceleration of urbanization processes are solved.

Description

technical field [0001] The invention relates to the field of computational fluid dynamics, in particular to a confluence calculation method under complex underlying surface conditions in cities. Background technique [0002] Slope water flow is an important part of the research on runoff generation and confluence, and plays a pivotal role in the field of hydrology and applied research. At the same time, slope water flow is the main driving force of soil water erosion process. Therefore, accurate simulation of slope water flow movement process is very important for revealing slope It is of great significance to study the law of surface water flow, clarify the mechanism of slope erosion, and build a simulation of the physical process of soil erosion. [0003] Slope flow movement belongs to the category of fluid movement. At present, the description of fluid motion can be carried out from three observation scales: macroscopic, mesoscopic, and microscopic. The macroscopic cont...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): G06F19/00
CPCG16Z99/00
Inventor 冯杰芮孝芳杨志勇杨涛刘宁宁何祺胜于赢东师鹏飞王开王兴勇王鹏王超
Owner CHINA INST OF WATER RESOURCES & HYDROPOWER RES
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products