|November 20, 2013, 15:45||
Doubt with Downstream Pressure Boundary Condition
Marcus Fernandes Araujo Filho
Join Date: Sep 2013
Posts: 10Rep Power: 5
I´m trying to simulate a flow over a spillway and i´m having trouble performing the simulation. As a downstream boundary condition I first tried to use a PRESSURE boundary with defined elevation in order to simulate my downstream rating curve. With this BC the model is unstable and I don´t get a good result (the flow pattern is just wrong).
In order to solve the problem I´ve tried some different downstream BC and was able to "solve" the problem by doing the following. I´ve used a PRESSURE boundary condition with defined fluid elevation, fluid fraction equal to one, checked the "stagnation pressure" option and defining the pressure value as atmospheric (see attachment). By doing so I´ve been able to run a sucessfull simulation. My question is if this boundary condition I´m using represents reality the way it should be, is it physically accurate? I need the water surface elevation downstream of my model to be constant, am I able to do so with this setup of boundary condition? Whta else should I do?
I´ve attached three pictures, one of the geometry of the model, one with the results of the simulation and one with the BC screen. If furthur information is needed I would be glad to provide.
Thank you in advance,
|boundary condition, spillway|
|Thread||Thread Starter||Forum||Replies||Last Post|
|Pressure boundary condition||C-H Kuo||Main CFD Forum||18||September 16, 2016 03:19|
|problem about pressure boundary condition at sharp corner||yhaomin2007||OpenFOAM Running, Solving & CFD||1||January 19, 2016 10:24|
|pressure wall boundary condition in CFX||murx||CFX||4||October 9, 2012 06:50|
|high pressure boundary condition||fragzilla||CFX||5||September 14, 2012 02:40|
|Setting outlet Pressure boundary condition using CAFFA code||Mukund Pondkule||Main CFD Forum||0||March 16, 2011 04:23|