CFD Online Logo CFD Online URL
www.cfd-online.com
[Sponsors]
Home > Forums > FLOW-3D

VFR (Q) boundary condition

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

Reply
 
LinkBack Thread Tools Display Modes
Old   June 11, 2013, 03:03
Default VFR (Q) boundary condition
  #1
New Member
 
morteza
Join Date: Jun 2013
Location: iran
Posts: 9
Rep Power: 4
(morteza) is on a distinguished road
Hi all dears,

I want to use VFR boundary condition in my simulation. In fact i want to use a volume flow rate such as a pump to exit flow in my domain with distinct flow rate. could you pleas, how i can do it?
(morteza) is offline   Reply With Quote

Old   June 12, 2013, 08:35
Default
  #2
Senior Member
 
michael barkhudarov
Join Date: Mar 2009
Posts: 331
Rep Power: 9
MuxaB is on a distinguished road
Quote:
Originally Posted by (morteza) View Post
Hi all dears,

I want to use VFR boundary condition in my simulation. In fact i want to use a volume flow rate such as a pump to exit flow in my domain with distinct flow rate. could you pleas, how i can do it?
What version of FLOW-3D are you using?
MuxaB is offline   Reply With Quote

Old   June 15, 2013, 01:22
Default
  #3
New Member
 
morteza
Join Date: Jun 2013
Location: iran
Posts: 9
Rep Power: 4
(morteza) is on a distinguished road
hi

flow-3D V.10.0.1

thank you
(morteza) is offline   Reply With Quote

Old   July 14, 2013, 02:04
Default
  #4
Senior Member
 
michael barkhudarov
Join Date: Mar 2009
Posts: 331
Rep Power: 9
MuxaB is on a distinguished road
This can be done in two ways. Either a mesh BC or a mass sink. A mesh BC is simply defined at the mesh edge, choose VFR BC, set the flow rate, set the direction of the flow - done!

A mass sink is defined using a geometry component. Define the component (e.g., a disk), and set its flow rate to a negative value.

Michael

Quote:
Originally Posted by (morteza) View Post
hi

flow-3D V.10.0.1

thank you
MuxaB is offline   Reply With Quote

Old   July 15, 2013, 02:03
Default
  #5
New Member
 
morteza
Join Date: Jun 2013
Location: iran
Posts: 9
Rep Power: 4
(morteza) is on a distinguished road
hi, prof. michael barkhudarov

thank you for your reply, but in VFR BC, you can only enter flow into domain not exit from domain. we can only determine direction of entering flow to domain not exiting flow from domain.
(morteza) is offline   Reply With Quote

Old   July 15, 2013, 11:08
Default
  #6
Senior Member
 
michael barkhudarov
Join Date: Mar 2009
Posts: 331
Rep Power: 9
MuxaB is on a distinguished road
Quote:
Originally Posted by (morteza) View Post
hi, prof. michael barkhudarov

thank you for your reply, but in VFR BC, you can only enter flow into domain not exit from domain. we can only determine direction of entering flow to domain not exiting flow from domain.
Not quite. While the flow rate is always positive, the direction of the flow is defined by the flow direction vector: positive - into the domain, negative - out of the domain.
MuxaB is offline   Reply With Quote

Old   July 16, 2013, 04:06
Default
  #7
New Member
 
morteza
Join Date: Jun 2013
Location: iran
Posts: 9
Rep Power: 4
(morteza) is on a distinguished road
Quote:
Originally Posted by MuxaB View Post
Not quite. While the flow rate is always positive, the direction of the flow is defined by the flow direction vector: positive - into the domain, negative - out of the domain.
Dear Prof.

Thank you for your reply, my problem solved. I have another question: It is possible to draw 2D streamline in flow3D, similar to 3D streamline?

best wishes
(morteza) is offline   Reply With Quote

Old   July 16, 2013, 18:38
Default
  #8
Senior Member
 
michael barkhudarov
Join Date: Mar 2009
Posts: 331
Rep Power: 9
MuxaB is on a distinguished road
I don't think so

Quote:
Originally Posted by (morteza) View Post
Dear Prof.

Thank you for your reply, my problem solved. I have another question: It is possible to draw 2D streamline in flow3D, similar to 3D streamline?

best wishes
MuxaB 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
Radiation interface hinca CFX 15 January 26, 2014 18:11
Error finding variable "THERMX" sunilpatil CFX 8 April 26, 2013 07:00
Opening Boundary Condition andreachan Main CFD Forum 11 March 19, 2013 17:46
Setting outlet Pressure boundary condition using CAFFA code Mukund Pondkule Main CFD Forum 0 March 16, 2011 04:23
Domain Imbalance HMR CFX 3 March 6, 2011 21:10


All times are GMT -4. The time now is 18:42.