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Old   February 10, 2021, 04:10
Default activePressureForceBaffleVelocity
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Hi, I'm look for any openfoam example that uses activePressureForceBaffleVelocity as a boundary condition. I understand it requires two cycle patches but I struggling to see this implemented anywhere.

I would like to use this for modelling a bursting disk. So when the pressure gets to a certain value the baffle opens and allows flow into the downstream domain from master to slave.

I currently have an example that uses a pressure jump for an actuator disk would this serve as a basis and I substitute the activePressureForceBaffleVelocity BC. I basically want to make sure I have all the correct syntax.
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Old   October 8, 2021, 14:37
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Still interested or almost over?
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Old   October 9, 2021, 06:09
Default activePressureForceBaffleVelocity
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Hi yes Iím still interested in getting a working example on this

Thanks
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Old   October 11, 2021, 16:32
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Hey,

I am working on a new tutorial that I will publish on my website. The aim is to simulate a vessel which does have a valve that opens after a defined pressure difference is reached (such as a rapture disc or safety valve). An impression is given below.




However for a first idea it is as follows:
  • Create your geometry (here the tank)
  • Use topoSet to create a face set. The face set includes all faces that are representing the rapture disc (or a valve or anything else). One can also add it to the snappyHexMeshDict to get a correct surface representation. However, the faces should be selected using topoSet
  • Convert the face set into a faceZone (also done in topoSet)
  • Use createBaffles to quadroplicate (nice word) the faces
    • a couple of cyclic patches
    • a couple of wall patches
  • Use createPatch to merge the walls into one patch (checkMesh will throw an error but its okay)
  • You are ready to go Ľ for U apply the boundary condition on the merged wall patch and set the cyclic to the corresponding name


That's it.
If its to complicated, I will upload the case probably during the case.
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Old   October 14, 2021, 01:57
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Hey,

I finished the case and published it on my website. Enjoy.

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Old   October 14, 2021, 02:49
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Thanks I will go through it

Much apresciated.
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Old   November 24, 2022, 05:34
Default Openfoam 10 versus 2112
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Hi Tobi

I am still working on this problem. I am using openfoam 10 and you have used openfoam 2112. Is there a reason for you switching to openfoam 2112. I cannot get this to work, i.e. create the 4 required patches with openfoam 10. I just post a question on this.
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Old   November 24, 2022, 11:33
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I am working within the team of ESI-OpenCFD, hence, I am involved into the developments here and also know whats released and whats going on

Thats why I used v2112.
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Old   November 24, 2022, 12:39
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Perfect. Nice to know why the change occurred. I can confirm 2206 is working and I get my cyclic patches and walls. Next step is to add the boundary condition.
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Old   November 24, 2022, 12:57
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Yes, because my patch was added to v2206.
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Old   December 6, 2022, 04:39
Default use with twoPhaseEulerFoam
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Hi Toby

I am using twoPhaseEulerFoam and have U.gas and U.water field. In your example you only have single U field. Do I apply the activePressureForceBaffleVelocity to each field so define it twice and do I need double the cyclic patches now.

i.e. you had 4 - 2 cyclic and 2 walls for a single U field

do I need 8 - gas (2 cyclic and 2 walls) and water (2 cyclic and 2 walls)

or can I use the same patches in the U.gas and U.water bc.

Thanks
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