Mass flow = 0 on opening

July 30, 2002, 15:42

Hi,

I have a model with large number of inlets, outlets and few openings. Unfortunably, the database file for this problem is not working anymore due to disk error.

I would like to try to close 3 openings in the model.

It is possible to specify an opening with Zero Mass Flow rate ???

How will this influnce on the model,- does it work as a wall or ???

Thanks a lot in advance.

Regards

Jens

July 31, 2002, 07:14

Hi Jens, yes , it's possible to specify an opening with zero mass flow rate defining it as MASS FLOW BOUNDARY and setting in command file or in USRBCS the zero flow condition.I have found a better convergence using the fortran subroutine.This type of patch works as a closed sect rather than a wall.

Regards

Tommaso

August 2, 2002, 18:13

If you just want the old openings to be walls, you can just remove them in the geometry file. Remember to adjust the number of patches.

July 30, 2002, 15:42	Mass flow = 0 on opening	#1
Jens Guest Posts: n/a	Hi, I have a model with large number of inlets, outlets and few openings. Unfortunably, the database file for this problem is not working anymore due to disk error. I would like to try to close 3 openings in the model. It is possible to specify an opening with Zero Mass Flow rate ??? How will this influnce on the model,- does it work as a wall or ??? Thanks a lot in advance. Regards Jens

July 31, 2002, 07:14	Re: Mass flow = 0 on opening	#2
Tommaso Guest Posts: n/a	Hi Jens, yes , it's possible to specify an opening with zero mass flow rate defining it as MASS FLOW BOUNDARY and setting in command file or in USRBCS the zero flow condition.I have found a better convergence using the fortran subroutine.This type of patch works as a closed sect rather than a wall. Regards Tommaso

August 2, 2002, 18:13	Re: Mass flow = 0 on opening	#3
Jan Rusås Guest Posts: n/a	If you just want the old openings to be walls, you can just remove them in the geometry file. Remember to adjust the number of patches.

Thread Tools
Show Printable Version Email this Page
Display Modes
Linear Mode Switch to Hybrid Mode Switch to Threaded Mode

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
[CFX] Target Mass Flow Opening	minger	CFX	0	August 24, 2011 18:34
Mass Flow Rate	student87	CFX	4	January 2, 2010 04:45
mass flow rate error	Masood	FLUENT	0	May 22, 2005 00:32
different mass flow rates	michael	FLUENT	4	February 21, 2005 03:48
Determine mass flow rate along flow path	Atit Koonsrisuk	CFX	2	October 5, 2003 04:47