CFD Online Logo CFD Online URL
www.cfd-online.com
[Sponsors]
Home > Forums > FLUENT

Modeling Flow through Closed Loop System

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

Reply
 
LinkBack Thread Tools Display Modes
Old   July 10, 2013, 09:03
Smile Modeling Flow through Closed Loop System
  #1
New Member
 
Mike
Join Date: Dec 2012
Location: Florida
Posts: 7
Rep Power: 5
CFDisFUN is on a distinguished road
Greetings;

I am trying to model fluid flow through a closed loop system. A pump circulates the fluid in the loop. In such problem, there is no inlet and outlet but the mass flow rate is known.

Could you please advise on how to tackle this problem? Or any way around it to have it solved. Thanks in advance!
CFDisFUN is offline   Reply With Quote

Old   July 10, 2013, 12:22
Default
  #2
Senior Member
 
Join Date: Mar 2009
Location: Indiana, US
Posts: 185
Rep Power: 9
delaneyluke is on a distinguished road
Break the loop and there you have an inlet and an outlet. The inlet and outlet should have BC's that will complete your loop

Regards
Luke
delaneyluke is offline   Reply With Quote

Old   July 10, 2013, 12:26
Default
  #3
New Member
 
Mike
Join Date: Dec 2012
Location: Florida
Posts: 7
Rep Power: 5
CFDisFUN is on a distinguished road
Thanks for your reply Luke.

The only problem I see to break the loop is How to match its inlet and outlet velocity and temperature over the time. I heared that "periodic boundary condition" might be useful but I don't know much about it. Please advise.
CFDisFUN is offline   Reply With Quote

Old   July 11, 2013, 13:36
Default
  #4
New Member
 
Constantine
Join Date: Jun 2013
Posts: 4
Rep Power: 5
ConstantineTheGreat is on a distinguished road
Quote:
Originally Posted by CFDisFUN View Post
Greetings;

I am trying to model fluid flow through a closed loop system. A pump circulates the fluid in the loop. In such problem, there is no inlet and outlet but the mass flow rate is known.

Could you please advise on how to tackle this problem? Or any way around it to have it solved. Thanks in advance!
Попробуйте выполнить этот пример из справки пользователя FLUENT
Try this tutorial
http://jullio.pe.kr/fluent6.1/help/html/tg/node23.htm
ConstantineTheGreat is offline   Reply With Quote

Old   July 11, 2013, 16:36
Default
  #5
Senior Member
 
Join Date: Mar 2009
Location: Indiana, US
Posts: 185
Rep Power: 9
delaneyluke is on a distinguished road
Hi Mike,
Could you post a picture of the model
Regards
Luke
delaneyluke is offline   Reply With Quote

Old   June 25, 2015, 15:54
Default Similar problem (2 possible solutions)
  #6
New Member
 
Wisconsin
Join Date: Jun 2015
Posts: 1
Rep Power: 0
IanA is on a distinguished road
I am working on similar problem, a closed loop with heat generation. I want to track how the temperature in the loop changes over time.

The two ideas I have are involve breaking the loop into several zones so that I have at least 1 straight section of pipe. I then either:

1) Use a momentum source term

2) Use a fixed velocity term

on the straight section of pipe.

This works to an extent (I get continuous and flow through the loop in one direction). however, a momentum source term is difficult to use to control the velocity and for some reason the velocity in the loop is not equal to what i set as the fixed term. very odd

Any tips would be much appreciated.
IanA is offline   Reply With Quote

Reply

Tags
boundary condition, closed loop, fluent

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
Ansys Fluid flow simulation for a cooling system help!!! pradon16 ANSYS 0 July 24, 2012 10:15
Review: Reversed flow CRT FLUENT 0 July 20, 2012 13:03
Modeling the mixing of air and kerosene in a flow channel StefanG CFX 3 June 11, 2012 20:21
Closed loop pipe flow maddalena OpenFOAM Running, Solving & CFD 34 August 16, 2011 11:46
mold flow modeling Pei Hsieh Main CFD Forum 0 May 4, 2005 10:08


All times are GMT -4. The time now is 04:55.