How to automatically switch inlet conditions from velocity to pressure and vice versa

nurs134 · May 28, 2021, 01:42

Hello everyone,

I need automatically switch inlet conditions from velocity to pressure and vice versa.

For example:
1st iteration: velocity inlet -> pressure outlet
2nd iteration: Generated pressure as inlet -> velocity outlet
3rd iteration: Generated velocity as inlet -> pressure outlet and etc.

How to program such kind of algorithm in OpenFOAM?

Kind regards,
Nursultan

Tobermory · May 28, 2021, 10:26

First up, I have to admit that I have no idea why you would want to do this, since it seems a little crazy to me. Perhaps you are running the solver for more that one iteration between the different boundary setups? Otherwise, the solution will not adapt quickly enough for your BCs to have an impact ...

Regardless, to answer your question, the simplest way would be to set up a run script that updates the boundaries using the foamDictionary command, runs the solver for one iteration (or more hopefully), then updates the BCs again and runs again etc. Fairly easy to code up in a bash script.

Good luck!

May 28, 2021, 01:42	How to automatically switch inlet conditions from velocity to pressure and vice versa	#1
nurs134 New Member Nursultan Join Date: May 2021 Posts: 5 Rep Power: 4	Hello everyone, I need automatically switch inlet conditions from velocity to pressure and vice versa. For example: 1st iteration: velocity inlet -> pressure outlet 2nd iteration: Generated pressure as inlet -> velocity outlet 3rd iteration: Generated velocity as inlet -> pressure outlet and etc. How to program such kind of algorithm in OpenFOAM? Kind regards, Nursultan

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May 28, 2021, 10:26		#2
Tobermory Senior Member Join Date: Apr 2020 Location: UK Posts: 668 Rep Power: 14	First up, I have to admit that I have no idea why you would want to do this, since it seems a little crazy to me. Perhaps you are running the solver for more that one iteration between the different boundary setups? Otherwise, the solution will not adapt quickly enough for your BCs to have an impact ... Regardless, to answer your question, the simplest way would be to set up a run script that updates the boundaries using the foamDictionary command, runs the solver for one iteration (or more hopefully), then updates the BCs again and runs again etc. Fairly easy to code up in a bash script. Good luck!