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Forum: OpenFOAM Running, Solving & CFD

August 17, 2010, 00:56

Replies: 25

Diesel Engine Combustion

Views: 8,300

Posted By arun

Hi Georg, From my previous experience, the heat...

Hi Georg,
From my previous experience, the heat release is highly dependent on the Arrhenius coefficients. If these values is not proper, the combustion will start too late during the engine cycle...

Forum: OpenFOAM Running, Solving & CFD

June 19, 2010, 03:14

Replies: 25

Diesel Engine Combustion

Views: 8,300

Posted By arun

Hi Georg, Can I know which chemistry input...

Hi Georg,

Can I know which chemistry input file you are using for the combustion chemical kinetics representation?

If you happen to use chem.inp_15 you can try change this:
...

Forum: OpenFOAM Running, Solving & CFD

April 13, 2009, 22:56

Replies: 25

Diesel Engine Combustion

Views: 8,300

Posted By arun

Hi Niklas, Thanks for your previous advices...

Hi Niklas,

Thanks for your previous advices to make my diesel engine simulation to work.
Right now I am simulating the combustion case with 15 species for the kinetics part and fine tuning my...

Forum: OpenFOAM Running, Solving & CFD

April 8, 2009, 10:44

Replies: 25

Diesel Engine Combustion

Views: 8,300

Posted By arun

Hi Niklas, I have checked the patches and...

Hi Niklas,

I have checked the patches and found that the top cell row belongs to cylinder as u suspected.
This was the main problem all the while and I manage to solve it by using -zHeadMin as...

Forum: OpenFOAM Running, Solving & CFD

April 8, 2009, 10:43

Replies: 25

Diesel Engine Combustion

Views: 8,300

Posted By arun

Hi Christof, I have tried with many...

Hi Christof,

I have tried with many smaller cell size and the simulation crash when reach 0 CAD.
Then after tried method suggested by Niklas the simulation can run completely from -180 to 180...

Forum: OpenFOAM Running, Solving & CFD

April 4, 2009, 02:30

Replies: 25

Diesel Engine Combustion

Views: 8,300

Posted By arun

Hi Niklas, Thanks for the bug info and the...

Hi Niklas,

Thanks for the bug info and the KIVA mesh info.
Right now I am learning how to compile FOAM so that can fix the bug.
So mean while, I tried to simulate from -180 and once the time...

Forum: OpenFOAM Running, Solving & CFD

March 31, 2009, 12:15

Replies: 25

Diesel Engine Combustion

Views: 8,300

Posted By arun

Hi Christof, I agree with you that the...

Hi Christof,

I agree with you that the compression ratio is too high,and I have recalculated it again it shows 44.
The actual engine compression ratio is 18.2.
I reaaly would like to upload my...

Forum: OpenFOAM Running, Solving & CFD

March 31, 2009, 12:09

Replies: 25

Diesel Engine Combustion

Views: 8,300

Posted By arun

Hi Niklas, Previously I did not try to run...

Hi Niklas,

Previously I did not try to run engineCompRatio.
And now I have tried it and this is the error I am getting.
Right now I assume this is due to the mesh condition where is was created...

Forum: OpenFOAM Running, Solving & CFD

March 30, 2009, 04:37

Replies: 25

Diesel Engine Combustion

Views: 8,300

Posted By arun

Hi Christof, Yes I am anticipating a...

Hi Christof,

Yes I am anticipating a pressure of 90bar at ignition TDC.

Start conditions:
IVC = -143 ATDC
EVO = 131 ATDC
Initial temperature = 313K
Initial Pressure = 119000 Pa
SOI (pilot)...

Forum: OpenFOAM Running, Solving & CFD

March 30, 2009, 03:52

Replies: 25

Diesel Engine Combustion

Views: 8,300

Posted By arun

Hi Niklas, Thank you for your reply....

Hi Niklas,

Thank you for your reply. Additionally, I have done the other calculation with - +50K and notice the changes in the pressure trace due to trapped mass. However, the problem still...

Forum: OpenFOAM Running, Solving & CFD

March 28, 2009, 07:23

Replies: 25

Diesel Engine Combustion

Views: 8,300

Posted By arun

Hi Christof, Thanks for your reply and its...

Hi Christof,

Thanks for your reply and its my bad that i have made typo error, the -143 CAD is the IVC time and 131 CAD is the EVO. So the mesh has no valves because i am only simulating the...

Forum: OpenFOAM Running, Solving & CFD

March 27, 2009, 22:36

Replies: 25

Diesel Engine Combustion

Views: 8,300

Posted By arun

Diesel Engine Combustion

Hi All,

Currently i am simulating diesel engine combustion and facing some problem with the pressure trace validation. I followed the way of setting case for dieselEngineFoam by combining...

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