Boundary/patch in middle of domain

ali.m.1 · January 12, 2016, 12:06

Hello

I'm wanting to assign a boundary condition in the middle of my domain E.g an outlet/inlet. Does anyone know how to do this?

I created a geometry in Fluent with two regions, and there was the interface region (between the blue and yellow), which I could assign conditions. This wouldn't run through the whole domain, as there was two regions (obviously).

When I stitched the regions together, the solver works, but the boundary disappeared, and thus I'm back to square one.

I know this is to be expected, as there is no boundary there, but I hope someone can understand my problem... Any help is appreciated

ripudaman · January 13, 2016, 14:22

Essentially you need to find the faces that you want to make a boundary from and make faceSet using setSet or topoSet.

Then you will have to convert that faceSet to a faceZone by using setsToZones utility.

Then run creatBaffles to create a baffle boundary from the new faceZone.

Before you run createBaffles make sure that the name of the patch you are trying to create has been included in both your boundary file as well as the field variable files in time 0 directory.

You can also use mergeOrSplitBaffles to split the single boundary plane into two coplanar boundary planes belonging to the same patch.

Good luck

Ripu

ali.m.1 · January 15, 2016, 05:50

Thanks Ripu

I'll give that a try.

ali.m.1 · January 18, 2016, 12:20

I've managed to insert a baffle into the domain, and can set BC's on it. Does anyone know how to set the baffle to 'invisible', so as only to read fields from it? Or a boundary condition which allows the fluid to pass through?

Cheers

ali.m.1 · January 20, 2016, 12:22

Here is an image of what I'm talking about.

This depicts an inlet at the top, and outlet at the bend, another inlet in the same place, and another outlet on the right. What I'm wanting to do is make the boundary invisible to the majority of the solver (it's multiphase), but keep it as an outlet for other parameters.

I've been stuck for a while now with this!

regards

XJ_Wang · November 27, 2020, 01:46

Hi Ali,

Did you solve this problem? I am also encountering such a problem.

Hope you can see it after several years you posted it!

Regards,
Xiangjie

ali.m.1 · November 27, 2020, 03:19

Hi.

Yes I think I did. See my PhD thesis for more info.

http://digitool.lib.strath.ac.uk/R/?...bject_id=31589

XJ_Wang · December 2, 2020, 23:42

Hi Ali,

Thanks for your reply and sorry for my late replying!

I will look into the thesis!

Bests,
Xiangjie

January 12, 2016, 12:06	Boundary/patch in middle of domain	#1
ali.m.1 Member Ali Join Date: Oct 2013 Location: Scotland Posts: 66 Rep Power: 12	Hello I'm wanting to assign a boundary condition in the middle of my domain E.g an outlet/inlet. Does anyone know how to do this? I created a geometry in Fluent with two regions, and there was the interface region (between the blue and yellow), which I could assign conditions. This wouldn't run through the whole domain, as there was two regions (obviously). When I stitched the regions together, the solver works, but the boundary disappeared, and thus I'm back to square one. I know this is to be expected, as there is no boundary there, but I hope someone can understand my problem... Any help is appreciated

January 13, 2016, 14:22	have a look at creatBaffles utility on how to do this.	#2
ripudaman Member Ripudaman Manchanda Join Date: May 2013 Posts: 55 Rep Power: 12	Essentially you need to find the faces that you want to make a boundary from and make faceSet using setSet or topoSet. Then you will have to convert that faceSet to a faceZone by using setsToZones utility. Then run creatBaffles to create a baffle boundary from the new faceZone. Before you run createBaffles make sure that the name of the patch you are trying to create has been included in both your boundary file as well as the field variable files in time 0 directory. You can also use mergeOrSplitBaffles to split the single boundary plane into two coplanar boundary planes belonging to the same patch. Good luck Ripu

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January 15, 2016, 05:50		#3
ali.m.1 Member Ali Join Date: Oct 2013 Location: Scotland Posts: 66 Rep Power: 12	Thanks Ripu I'll give that a try.

January 18, 2016, 12:20		#4
ali.m.1 Member Ali Join Date: Oct 2013 Location: Scotland Posts: 66 Rep Power: 12	I've managed to insert a baffle into the domain, and can set BC's on it. Does anyone know how to set the baffle to 'invisible', so as only to read fields from it? Or a boundary condition which allows the fluid to pass through? Cheers

January 20, 2016, 12:22		#5
ali.m.1 Member Ali Join Date: Oct 2013 Location: Scotland Posts: 66 Rep Power: 12	Here is an image of what I'm talking about. This depicts an inlet at the top, and outlet at the bend, another inlet in the same place, and another outlet on the right. What I'm wanting to do is make the boundary invisible to the majority of the solver (it's multiphase), but keep it as an outlet for other parameters. I've been stuck for a while now with this! regards

November 27, 2020, 01:46		#6
XJ_Wang New Member Xiangjie Wang Join Date: Jul 2019 Posts: 26 Rep Power: 6	Hi Ali, Did you solve this problem? I am also encountering such a problem. Hope you can see it after several years you posted it! Regards, Xiangjie

November 27, 2020, 03:19		#7
ali.m.1 Member Ali Join Date: Oct 2013 Location: Scotland Posts: 66 Rep Power: 12	Hi. Yes I think I did. See my PhD thesis for more info. http://digitool.lib.strath.ac.uk/R/?...bject_id=31589

December 2, 2020, 23:42		#8
XJ_Wang New Member Xiangjie Wang Join Date: Jul 2019 Posts: 26 Rep Power: 6	Hi Ali, Thanks for your reply and sorry for my late replying! I will look into the thesis! Bests, Xiangjie