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-   -   VFR (Q) boundary condition (https://www.cfd-online.com/Forums/flow-3d/119154-vfr-q-boundary-condition.html)

 (morteza) June 11, 2013 03:03

VFR (Q) boundary condition

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?

 MuxaB June 12, 2013 08:35

Quote:
 Originally Posted by (morteza) (Post 433280) 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?

 (morteza) June 15, 2013 01:22

hi

flow-3D V.10.0.1

thank you

 MuxaB July 14, 2013 02:04

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) (Post 434090) hi flow-3D V.10.0.1 thank you

 (morteza) July 15, 2013 02:03

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.

 MuxaB July 15, 2013 11:08

Quote:
 Originally Posted by (morteza) (Post 439721) 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.

 (morteza) July 16, 2013 04:06

Quote:
 Originally Posted by MuxaB (Post 439841) 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

 MuxaB July 16, 2013 18:38

I don't think so

Quote:
 Originally Posted by (morteza) (Post 439974) 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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