mass source

razieh anari · November 29, 2013, 10:39

HI
I have a chamber, i want to keep the water level constant. I think, input fluid & output fluid should be equal. can i use mass source ( in meshing & geometry tab ) for negative flow rate? how ????

JBurnham · December 3, 2013, 12:09

Yes, you can. The M/M source is defined w/ center on the origin, and normal vector facing up. Rotate and translate it so that it is on the floor where you want to withdraw fluid, still with normal vector pointing upward. Set the mass flow rate to a negative number.

The trick is to keep the m/m source always completely submerged at all times. If part of it is above the free surface, then the entire flow rate will not be removed. A uniform velocity is applied across the source, based on the source area and the desired mass flow rate. To have a uniform flow rate, all points on the m/m source must be submerged.

razieh anari · December 13, 2013, 08:08

thank you so much dear JBurnham
. but my problem still is not solved. Can I have your email to send my simulation file?

November 29, 2013, 10:39	mass source	#1
razieh anari New Member razieh anari Join Date: May 2013 Posts: 6 Rep Power: 12	HI I have a chamber, i want to keep the water level constant. I think, input fluid & output fluid should be equal. can i use mass source ( in meshing & geometry tab ) for negative flow rate? how ????

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
GPU Linear Solvers for OpenFOAM	gocarts	OpenFOAM Announcements from Other Sources	37	August 17, 2022 14:22
[swak4Foam] groovyBC in openFOAM-2.0 for parabolic velocity bc	ofslcm	OpenFOAM Community Contributions	25	March 6, 2017 10:03
[swak4Foam] funkySetFields compilation error	tayo	OpenFOAM Community Contributions	39	December 3, 2012 05:18
Problem with Mass source, Momentum source theory	diffo	Fluent UDF and Scheme Programming	0	August 20, 2009 06:10
OpenFOAM on MinGW crosscompiler hosted on Linux	allenzhao	OpenFOAM Installation	127	January 30, 2009 19:08

December 3, 2013, 12:09		#2
JBurnham Senior Member Jeff Burnham Join Date: Apr 2010 Posts: 204 Rep Power: 17	Yes, you can. The M/M source is defined w/ center on the origin, and normal vector facing up. Rotate and translate it so that it is on the floor where you want to withdraw fluid, still with normal vector pointing upward. Set the mass flow rate to a negative number. The trick is to keep the m/m source always completely submerged at all times. If part of it is above the free surface, then the entire flow rate will not be removed. A uniform velocity is applied across the source, based on the source area and the desired mass flow rate. To have a uniform flow rate, all points on the m/m source must be submerged.

December 13, 2013, 08:08		#3
razieh anari New Member razieh anari Join Date: May 2013 Posts: 6 Rep Power: 12	thank you so much dear JBurnham . but my problem still is not solved. Can I have your email to send my simulation file?