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June 15, 2021, 05:41 |
How to use PatchBC
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#1 |
New Member
Nino Minicucci
Join Date: Jun 2021
Posts: 7
Rep Power: 5 |
Hello, my name is Nino and I'm working with REEF3D to simulate the scour produced by a spillway in the relative plunge pool. In this first stage, I would like to use the PatchBc to simulate an experimental setup in which the water enter the domain through an "hole" in the bottom so to raise the flow level and overtop a weir, but I didn't understood how to use the PatchBC to reach my goals.
With best regards Nino |
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June 17, 2021, 09:32 |
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#2 |
Super Moderator
Hans Bihs
Join Date: Jun 2009
Location: Trondheim, Norway
Posts: 403
Rep Power: 19 |
with patchBC, you convert the solid ghostcells in a defined area (box, circle or line) into inflow or outflow conditions. Then you can assign different boundary condition characteristics.
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June 17, 2021, 10:08 |
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#3 |
New Member
Nino Minicucci
Join Date: Jun 2021
Posts: 7
Rep Power: 5 |
Hi, thanks for the reply. In the simulation I've set a wall condition for all the boundaries (as you suggested in a past threadh), turn off the ioFlow and set this condition:
B 411 1 0.2 B 440 1 1 0.0 1.0 0.0 1.0 During the simulation its possible to observe a value for the Uq equals to the condition setted but the Ui remains always equal to zero. So in post-processing nothing happens in the domain. I don't know if I missed some additional conditions or something else. Best regards |
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June 17, 2021, 10:53 |
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#4 |
Super Moderator
Hans Bihs
Join Date: Jun 2009
Location: Trondheim, Norway
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B 440 1 1 0 0 1 0 1 has a the following problem:
x_start =1 x_ end =0 that should be reversed. |
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June 17, 2021, 10:58 |
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#5 |
New Member
Nino Minicucci
Join Date: Jun 2021
Posts: 7
Rep Power: 5 |
Oh, my bad, I'm sorry. Can I ask you what stand for face?
Thanks |
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June 17, 2021, 11:32 |
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#6 |
Super Moderator
Hans Bihs
Join Date: Jun 2009
Location: Trondheim, Norway
Posts: 403
Rep Power: 19 |
You can find the face definition in DIVEMesh User Guide in chapter 1.2.
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June 17, 2021, 11:43 |
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#7 |
New Member
Nino Minicucci
Join Date: Jun 2021
Posts: 7
Rep Power: 5 |
I got it. Thanks again for the quickness in the reply and for the work you've done.
Best regards |
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October 16, 2021, 04:01 |
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#8 | |
New Member
Hao hao
Join Date: Aug 2021
Posts: 9
Rep Power: 5 |
Quote:
My code is B441 0 0 0.0 0.0 0.0 35 0.0 0.012 0.0 0.6. ID and face is the same thing? |
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October 17, 2021, 15:36 |
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#9 |
Super Moderator
Hans Bihs
Join Date: Jun 2009
Location: Trondheim, Norway
Posts: 403
Rep Power: 19 |
Hi Hao Hao,
the face and ID are not the same thing. The face refers to the geometry: on which side of the cell is the patchBC? See the DIVEMesh User Guide, section 1.2, Fig. 1.1 for the definition of the faces / cell sides. Important: the patchBC will convert a solid boundary to an inflow or outflow, so it needs to be placed on the domain boundary or at other solid boundaries. Each individual patchBC should get its own ID. With this ID, it is possible to assign different boundary conditions to the patchBCs, see B 411 to B 422. |
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October 18, 2021, 22:22 |
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#10 | |
New Member
Hao hao
Join Date: Aug 2021
Posts: 9
Rep Power: 5 |
Quote:
Thank you for your detailed explanation on how to define ID and patchBC functions. Now I have a preliminary understanding of it. Best Regards |
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February 18, 2022, 19:58 |
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#11 |
New Member
Djamel
Join Date: Feb 2017
Location: Paris
Posts: 1
Rep Power: 0 |
Hi REEF3D team,
I’m still confused about patchBC, is there any tutorial on how to use it? I’ve made a simple case similar to a submerged drainage outfall (see attached picture). I was hoping to solve this using patchBC and CFD solver. All faces are defined as walls in DiveMESH except top surface (symmetry plane). The patchBC is placed on the domain boundary (face 3 in reference to DiveMESH user guide). I’m using the following command to represent the inflow: B 210 1 B 411 1 10.0 B 441 1 3 4.0 6.0 0.0 0.0 0.0 2.0 During the simulation, Qi and Ui are equal to 0 and at the end, the water level in the domain is equal to the one initially imposed (no inflow). What am I missing here? Is there any other parameters that need to be set? Anyways, thanks for the work done. |
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February 23, 2022, 23:26 |
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#12 |
Member
Ismael Incoencio
Join Date: Sep 2021
Posts: 45
Rep Power: 7 |
Hi, just wanted to add I am also having this problem wherein if I set a PatchBC with an inflow and no outflow condition anywhere else the overall volume of water doesn't seem to change. I also hope a tutorial/reference setup would be available for this.
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March 25, 2022, 05:25 |
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#13 |
Super Moderator
Hans Bihs
Join Date: Jun 2009
Location: Trondheim, Norway
Posts: 403
Rep Power: 19 |
Dear Djamel and Ismael,
could you share the control files where you experience problems? I am attaching a very simple patchBC test case. |
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March 26, 2022, 05:54 |
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#14 |
Super Moderator
Hans Bihs
Join Date: Jun 2009
Location: Trondheim, Norway
Posts: 403
Rep Power: 19 |
Ok, follow up on patchBC: it looks like there was a critical problem with setting the velocities on the patchBC. I have fixed this now and it will be part of the new release.
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March 26, 2022, 08:53 |
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#15 |
Super Moderator
Hans Bihs
Join Date: Jun 2009
Location: Trondheim, Norway
Posts: 403
Rep Power: 19 |
PatchBC is now fixed in REEF3D 22.03.
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March 27, 2022, 04:19 |
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#16 | |
Member
Ismael Incoencio
Join Date: Sep 2021
Posts: 45
Rep Power: 7 |
Quote:
Good afternoon Prof Hans, I have attached the sample files as requested. I set the initial a solid at the same height as the initial water level and from my runs it never gets overtopped.
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March 27, 2022, 04:38 |
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#17 |
Super Moderator
Hans Bihs
Join Date: Jun 2009
Location: Trondheim, Norway
Posts: 403
Rep Power: 19 |
Have you tried with 22.03?
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March 27, 2022, 05:11 |
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#18 |
Member
Ismael Incoencio
Join Date: Sep 2021
Posts: 45
Rep Power: 7 |
Oops, sorry for the late reply; I had the page loaded up before your post. I will test it out on the latest release.
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March 27, 2022, 12:27 |
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#19 |
Member
Ismael Incoencio
Join Date: Sep 2021
Posts: 45
Rep Power: 7 |
Good evening Prof Hans, I believe the 411 and 442 works now thank you! The water is now overtopping the obstruction I placed properly. I will try the other PatchBC's later.
I have attached the difference in results as two images.
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March 27, 2022, 16:06 |
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#20 |
Super Moderator
Hans Bihs
Join Date: Jun 2009
Location: Trondheim, Norway
Posts: 403
Rep Power: 19 |
Great to hear! Thanks for the feedback!
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