コンテンツメニュー

Li Hongyuan

Affiliate Master Yamaguchi University

Consideration on the boundary condition for calculations of open channel flow

Memoirs of the faculty of engineering, Yamaguchi university Volume 66 Issue 2 Page 47-52
published_at 2016-03
A040066000204.pdf
[fulltext] 930 KB
Title
開水路流れの境界条件に関する検討
Consideration on the boundary condition for calculations of open channel flow
Creators Hadano Kesayoshi
Creators Li Hongyuan
Creators Nagano Hiroyuki
Source Identifiers
Creator Keywords
open channel flow water level calculation boundary condition steady flow equation unsteady flow equation free surface boundary condition
The reason given for the boundary condition of calculation open channel flow leaves some insufficiencies. Calculation for tranquil flow is done toward upstream with downstream boundary condi-tion for depth, the reason is explained as the influence of downstream water level relating to wave propa-gation. But it is logically wrong since the discussion is based on the equation of steady flow without un-steady term. Mathematically, we have only to give boundary condition where the water depth is fixed and to proceed the calculation from the boundary condition position. Also, since the steady flow can be found by solving the governing equation for unsteady flow with steady boundary condition, boundary condition of the depth for steady flow calculation can be given in the same manner as for the analysis using the characteristic curve method. Boundary condition for free surface is obtained directly by equating the normal components of the velocities of water particles on the surface and of free surface variation.
Languages jpn
Resource Type departmental bulletin paper
Publishers 山口大学工学部
Date Issued 2016-03
File Version Version of Record
Access Rights open access
Relations
[ISSN]1345-5583
[NCID]AN00244228
[isVersionOf] [URI]http://memoirs.lib-e.yamaguchi-u.ac.jp/
Schools 大学院創成科学研究科(工学)