CFD Online Logo CFD Online URL
www.cfd-online.com
[Sponsors]
Home > Forums > OpenFOAM Running, Solving & CFD

mass flow rate...

Register Blogs Members List Search Today's Posts Mark Forums Read

Reply
 
LinkBack Thread Tools Display Modes
Old   November 19, 2013, 16:27
Default mass flow rate...
  #1
Member
 
ziehjay
Join Date: Jul 2013
Posts: 44
Rep Power: 5
sanjar is on a distinguished road
Hey guys,

i have a specific question referring to my simulation in OF. my simulation is about a multiphase flow, consisting of water and sand. i have to variate my mass flow rate of sand and show its effects on pressure. but i dont know how to variate it in my simulation. there i no parameter which stands for the mass flow rate of sand.

btw: the mass flow rate is a calculated calue from a trivial formular. i have the sand concentration (wt %), which is the solution of mass flow rate sand / (mass flow rate water + mass flow rate sand)...the parameters of the velocity, the surface of my inlet where the multiphase fluid flows out and the densitiy of sand and water is known. so its just simple mathemtatics

but i dont know hw to set the mass flow rate of sand as an parameter.

if there is someine who is willing to look at my simulation, is prepared a download link. so you can just take a look at it. i think its a very ease problem, but i cant find the solution. so sorry for this stupid question, please help me out guys.

just write a message and i will send you the link

THANKS!
sanjar is offline   Reply With Quote

Old   December 2, 2013, 01:09
Default
  #2
Member
 
Christian Butcher
Join Date: Jul 2013
Location: Japan
Posts: 85
Rep Power: 5
chrisb2244 is on a distinguished road
Are you using interFoam? If so, are the fractions of sand and water controlled by your alpha1 field?

My understanding of your question is that you have some sort of pipe/channel through which both sand and water are flowing, with an inlet at one end and an outlet at the other end?

When you say that the "surface of my inlet where the multiphase fluid flows out" is known, do you mean that you know the position/shape of the surface, or that you know the other parameters (density, velocity, concentration) at this surface?

If you have a mixture of sand and water input at the entrance, and a known concentration, I would imagine that you can set alpha1 BC on the inlet to a fixedValue condition, and give the value=concentration, as a value between 0 and 1. IF you need the sand to be at the bottom, but of a thickness that varies between simulations, then you can use the setFieldsDict to describe a box in which you set the value of alpha1 to either 0 or 1, whichever corresponds with the sand, and then use your alpha1 boundary condition file to describe a uniform default of the other value (ie the water).

If I have horribly misunderstood your problem, I apologise.

Christian
chrisb2244 is offline   Reply With Quote

Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
CFX turbo - Mass flow rate Vashishth Patel CFX 7 April 3, 2014 20:33
Mass Flow rate in spray water modeling Behnam Ghadimi FLUENT 0 June 8, 2013 16:05
Mass Flow rate in spray water modeling Behnam Ghadimi Main CFD Forum 0 June 8, 2013 15:48
negative global mass flow rate Gimli FLUENT 0 April 21, 2006 07:17
mass flow rate error Masood FLUENT 0 May 22, 2005 00:32


All times are GMT -4. The time now is 17:14.