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kivaTest tutorial-fault on temperature (engineFoam)

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Old   March 4, 2010, 06:51
Default kivaTest tutorial-fault on temperature (engineFoam)
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Ayhan Eses
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Hi all!

I'm an openfoam beginner. I used kivaTest tutorial (OpenFoam-1,5-dev on Slax). without any modification.

in combustionProperties file "ignite yes;"
Pressure is not increase but temperature is increasing continuously.


I think pressure should have increased to about ~60 -70 bar, temperature should have increased to ~2700-2900 K after TDC decrease again. So i cant find where is problem. Please inform me about what should i do for correct work.

Thanks for your help,
Best Regards.
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Old   October 12, 2013, 13:23
Default Pressure Increase
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Apoorv Talekar
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Rescale the pressure in paraFoam, display mode.
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Old   August 21, 2015, 16:20
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hi
what's your T dictionary in boundary conditions?
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Old   August 21, 2015, 16:25
Default kivaToFoam
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hi everybody
1) I want to run the kivaTest by bore*stroke=76*66 in different compression ratio e.g.,12 and 20. How can i create this C.R ? I mean just by changing GoemetryDictionary I can't fix my favorite compression ratio?
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Old   August 21, 2015, 17:34
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Ayhan Eses
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hi kaveh19,
i suggest you should create new geometry and mesh for different CR. then check your mesh and engine compression ratio with checkMesh & engineCompRatio

wyldckat and kaveh19 like this.
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Old   August 25, 2015, 16:08
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Dear ayhan515,
I have modified the below case by your guides:
bore=0.086
stroke=0.086
Fortunately I modified the compression ratio as same as I desired .I received ok for checkMesh .
Vmax = 0.00053768, Vmin = 3.83001e-05
Vmax/Vmin = 14.0386

************************************************** *
My geometry contains 2 cylinder ,one for Vmin and another for Vmax.
I have meshed the geometry in Gambite, but unfortunately I don’t know what boundary condition should I use fore jointed face between Vmin and Vmax volumes .
Some points:
1-wheater or not I consider it Gambite and openFoam will consider it as a wall so the wall appears it paraFoam as I expected .
2-In default case of kivaTest this wall condition doesn’t exist.
So when I want to run the test case .
What's your suggestion? Had you this problem?
Thanks in advance.
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Old   August 25, 2015, 16:14
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hi ayhan515,
unfortunately I don't know how i can upload in cfd online .Could you please give me your email in order to I send my test case by details?
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Old   August 26, 2015, 08:27
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Ayhan Eses
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Dear kaveh19,

1.1- create a geometry

just draw single cylinder (not 2 parts)
(for your CR=20 case) diameter: 76 mm height:69,473 mm

1.2-check z direction is height otherwise rotate your geometry.

1.3-rename the bottom surface as "piston"
rename the side surface as "liner"
rename the top surface as "cylinderHead"

2.create a CFD mesh from geometry and check named surfaces.

3.convert your mesh to Foam mesh.

https://yadi.sk/d/5OyB8MYJifqvu

sorry i've never used gambit i couldn't help.

i hope more professional helps come.

best regards.

Quote:
Originally Posted by kaveh19 View Post
Dear ayhan515,
I have modified the below case by your guides:
bore=0.086
stroke=0.086
Fortunately I modified the compression ratio as same as I desired .I received ok for checkMesh .
Vmax = 0.00053768, Vmin = 3.83001e-05
Vmax/Vmin = 14.0386

************************************************** *
My geometry contains 2 cylinder ,one for Vmin and another for Vmax.
I have meshed the geometry in Gambite, but unfortunately I don’t know what boundary condition should I use fore jointed face between Vmin and Vmax volumes .
Some points:
1-wheater or not I consider it Gambite and openFoam will consider it as a wall so the wall appears it paraFoam as I expected .
2-In default case of kivaTest this wall condition doesn’t exist.
So when I want to run the test case .
What's your suggestion? Had you this problem?
Thanks in advance.
ayhan515 is offline   Reply With Quote

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