# VFR (Q) boundary condition

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 June 11, 2013, 03:03 VFR (Q) boundary condition #1 New Member   morteza Join Date: Jun 2013 Location: iran Posts: 9 Rep Power: 4 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?

June 12, 2013, 08:35
#2
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michael barkhudarov
Join Date: Mar 2009
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Quote:
 Originally Posted by (morteza) 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?

 June 15, 2013, 01:22 #3 New Member   morteza Join Date: Jun 2013 Location: iran Posts: 9 Rep Power: 4 hi flow-3D V.10.0.1 thank you

July 14, 2013, 02:04
#4
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michael barkhudarov
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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) hi flow-3D V.10.0.1 thank you

 July 15, 2013, 02:03 #5 New Member   morteza Join Date: Jun 2013 Location: iran Posts: 9 Rep Power: 4 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.

July 15, 2013, 11:08
#6
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michael barkhudarov
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Quote:
 Originally Posted by (morteza) 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.

July 16, 2013, 04:06
#7
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morteza
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Quote:
 Originally Posted by MuxaB 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

July 16, 2013, 18:38
#8
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michael barkhudarov
Join Date: Mar 2009
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I don't think so

Quote:
 Originally Posted by (morteza) 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

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