Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

A method of simulating the surface roughness of complex terrain based on openfoam

A technology of surface roughness and complex terrain, applied in the field of computational wind engineering, can solve the problems of expensive purchase cost, difficult to meet all needs of users, and the source program is not open.

Active Publication Date: 2020-09-08
HUAZHONG UNIV OF SCI & TECH
View PDF3 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

CFD commercial software is simple and easy to use, but it is expensive to purchase, and the source program is not disclosed. The secondary development interface provided has relatively large limitations, and it is difficult to meet all the needs of users.

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
  • A method of simulating the surface roughness of complex terrain based on openfoam
  • A method of simulating the surface roughness of complex terrain based on openfoam
  • A method of simulating the surface roughness of complex terrain based on openfoam

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] The length, width, and height of the three-dimensional flat terrain CFD model of Example 1 are 24km, 24km and 8km respectively. The fine grid is used in the area of ​​interest, and the grid size is 20m. The coarse grid is used far away from the area of ​​interest, and the minimum grid size is the bottom surface in the vertical direction. 1m, the maximum growth rate of the grid in the computational domain is 1.2;

[0050] 1.3) Realize the data conversion between the terrain data grid node of the computational domain and the grid node of the 3D flat terrain CFD model: According to the coordinates of each bottom surface grid data node in the 3D flat terrain CFD model, find it in the terrain data grid The corresponding position in the node, and then use the elevation of the three terrain data grid nodes around the position to interpolate the elevation of the bottom grid node through the triangular coplanar linear interpolation. At the same time, in the three-dimensional flat te...

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 belongs to the field of computing wind engineering, and discloses an OpenFOAM-based method for simulating complex terrain surface roughness. The method comprises the following steps of 1) building a complex terrain CFD model, and generating a refined grid; 2) extracting surface roughness length data of the complex terrain CFD model, converting a surface roughness length into a surface cover vegetation height, and providing an accurate data basis for simulating an influence of a surface cover vegetation on a wind field of a complex terrain; 3) calculating resistance coefficients of the surface cover vegetation to the wind field at different heights, and then converting the surface cover vegetation height into the corresponding resistance coefficient; and 4) adding the resistance coefficient and a resistance item of the surface cover vegetation by using OpenFOAM, thereby obtaining a more accurate complex terrain wind field characteristic simulation result. A program language supported by a computer is used; the influence of the surface roughness on the wind field of the complex terrain is considered; and therefore, the numerical simulation accuracy of the wind field ofthe complex terrain is improved.

Description

Technical field [0001] The invention belongs to the field of computational wind engineering, and more specifically, relates to a method for simulating the surface roughness of complex terrain. Background technique [0002] The surface roughness length means that due to the influence of the unevenness of the surface or the geometry of the ground features, the position where the wind speed is zero on the wind speed profile is not on the surface (where the height is zero), but at a certain height from the surface. This height is also called the aerodynamic roughness length, which is a comprehensive characteristic parameter that affects the shape and retarding force of the passing fluid. The length of the surface roughness is caused by vegetation on the surface, which represents the aerodynamic characteristics of the surface, reflects the weakening effect of the surface on the wind speed, and depends on the roughness factors, such as the geometry, size and height, distribution type a...

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
Patent Type & Authority Patents(China)
IPC IPC(8): G06F30/28G06F16/29G06T17/05
CPCG06F30/20G06T17/05Y02A90/10
Inventor 刘震卿吴晓波熊世树
Owner HUAZHONG UNIV OF SCI & TECH
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com