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Old   November 2, 2015, 13:08
Default How to engineFoam?
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Hello. I would like use engineFoam solver for my own case.

Additional info:
CAELinux 2013 64bit
I uninstall openfoam211 and install openfoam221 because kivaTest and entire engineFoam solver doesn't work due to well known bug.
Salome-meca 6.6

At first I create my own geometry of combustion chamber. Then I mesh it structurally. Centre part is divided cylinder.

Dimensions of geometry:
Diameter = 38mm
Heigh = c.a. 55mm

I create groups of faces for liner, piston and cylinderHead and export mesh to unv. (Also I create group of volumes containing all 76500hexahedrons. I don't know if this is necessary? Or maybe I shouldn't create it? )

Then I create my own case folder tree.
I run ideasUnvToFoam.
Because my geometry is in millimetre I run
transformPoints -scale '(0.001 0.001 0.001)'

I'm not really sure if I run checkMesh and engineCompRatio as next step. Is it important to solver?

Anyway I run them in one of my others attempts. Results:

Are those results really ok?

Ok, Now I edit a little bit files from kivaTest (I based my case on kivaTest).
In file engineGeometry I set parameters of conRodLenght, bore, stroke, rpm. I remove clearance because I can't find what it is but it looks like this settings is optional? Anyway I would like to know what it is...
In file combustionProperties I set location ignition inside my geometry.
In file controlDict I set deltaT to 0.0625.
In file boundaries I set type as wall instead of patch.

I run engineFoam.
It solve my case to -25 CA and then temperature blows up (randomly for example from -3e27 to 3e54). (core dumped)

So I decide to edit my case again and start from -25 CA:
In file controlDict I set deltaT to 0.001 and startTime -25
In file fvSolution I set nCorrectors to 6 and nonOrthogonalCorrectors to 3

I run engneFoam.
It solve my case to -20 CA and then termperature and pressure blows up. Here is end of logfile:

At the end I run checkMesh for -20 geometry:

I wonder if
Max aspect ratio = 109.998

is really ok?

I hope that somebody could help me a little bit with this. I would like to became openFoam expert some day.

Greetings and thanks for reading!

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Old   December 4, 2015, 11:35
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Hello again.
I have learned how to create property mesh and run simulation.
Unfortunately there is something wrong with chemistry properties or something like that but it cause in big ignition delay.
2000 RPM
spark ignition = -17C.A.
simulation starts from -75C.A with 1bar, 373.15K inlet temperature.

Just look at plots of pressure:
and temperature:

What could I do wrong or what can I do to fix it?
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