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March 17, 2013, 08:14 |
reactingfoam - pressure field
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#1 |
New Member
Jacopo
Join Date: Mar 2013
Location: Italy
Posts: 18
Rep Power: 13 |
I have just started with OpenFoam, so I am still lost in the dark.
I have a question.Can anyone explain me why the reactingFoam does not calculate the pressure field? I have run the tutorial example and the pressure field is uniform from the beginning until the end of the simulation. What is the reason of that? The screenshot I have uploaded is from the 0.3 sec. |
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March 18, 2013, 11:26 |
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#2 |
Senior Member
Marco A. Turcios
Join Date: Mar 2009
Location: Vancouver, BC, Canada
Posts: 740
Rep Power: 28 |
Please describe your case setup and boundary conditions. Right now you don't have much for us to go on...
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March 18, 2013, 13:59 |
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#3 |
New Member
Jacopo
Join Date: Mar 2013
Location: Italy
Posts: 18
Rep Power: 13 |
Thank you for you answer
- In fact I have been trying to modify the reactingFoam to make it working with changed geometry and always got the uniform pressure field. -Than I run the case from tutorial - just went to the tutorial and run the case without changing anything . At the end I also got the uniform pressure - it is shown on the picture I have uploaded. It just have no sense for me.... why the solver does not compute pressure in this case? |
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March 19, 2013, 10:55 |
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#4 |
Senior Member
Marco A. Turcios
Join Date: Mar 2009
Location: Vancouver, BC, Canada
Posts: 740
Rep Power: 28 |
Which tutorial are you running? I ask because that looks like the geometry for cavity, and the geometry for reactingFoam (based on PitzDaily) is very different.
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March 20, 2013, 01:43 |
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#5 |
Senior Member
Karl-Johan Nogenmyr
Join Date: Mar 2009
Location: Linköping
Posts: 279
Rep Power: 21 |
I guess you are running the counterFlowFlame tutorial. Default, the tutorial saves out in ascii with 6 digits precision. This case operates at a pressure of 1e5 Pa, while flow induced pressure differences are about 0.015 Pa. These small differences are completely lost at save-out. Switching to binary in controlDict, and you can see the differeneces. It appears though as if paraview is having trouble displaying the field still.
Hack: switch to ascii and precision 16. Open 0.3/p in a text editor and search replace "100000." with "0." to remove the offset of 100000. Now paraview will show a nice smooth pressure field actually used by the solver. K |
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March 21, 2013, 04:54 |
Solved
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#6 |
New Member
Jacopo
Join Date: Mar 2013
Location: Italy
Posts: 18
Rep Power: 13 |
Yes! You were completely right , the pressure varies less than 1 Pa - right now I can see everything
Thanks a lot! |
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