reactingfoam - pressure field
 

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.

Please describe your case setup and boundary conditions. Right now you don't have much for us to go on...

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?

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.

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

Solved
 

Yes! You were completely right , the pressure varies less than 1 Pa - right now I can see everything :)

Thanks a lot!