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.

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