AachenBomb

jean_kuebbeler · June 27, 2005, 07:42

Hi there,

I'd like to simulate diesel spray and ignition for
my diploma thesis beeing part of a cold start project.
Where can I get information, like recent thesis, on creating a model in Open Foam.
Is Aachen Bomb the right solver. And what are the differences to the KIVA solver.
Thank you.

Sincerely,

Jean

niklas · June 27, 2005, 10:32

Hey,

The aachenBomb case use the dieselFoam application, you have mixed up your terminology there slightly.

Since I started with KIVA and was part of developing the dieselFoam application I know what the important differences are

1. KIVA solves for internal energy, dieselFOAM - enthalpy.
2. The spray models in KIVA are all available in the dieselSpray class (although turbulent dispersion is handled slightly different)
3. The chemistry/combustion in KIVA is a bit tediuous to use and the standard chemistry solver is not very good for larger mechanisms. The chemistry in dieselFoam is based on the CHEMKIN approach and use a correct stiff ODE solver. The chemistryModel in OpenFOAM has the option to solve chemistry as KIVA does (sequential), but I do not recommend anyone using it, since it was implemented just for direct comparison between KIVA/OpenFOAM. Further, the combustion model in dieselFoam is hard-coded and is based on Chalmers Partially Stirred Reactor model.

You should be able to run any KIVA case (not using valves) in OpenFOAM using the kivaToFoam converter.

N

jean_kuebbeler · June 28, 2005, 05:00

Thanks for the fast answer.
I am now looking for good literature (for beginners) about the dieselFOAM application.

See you,

Jean

farbfilm · April 14, 2009, 05:51

Hi,

does anybody have some literature or documentation for the dieselFoam solver??

For my thesis, I have to know the basics how the Euler/Lagrangian approach is realized in OpenFoam!!

What I already know is the basic idea of this approach - the gasphase is treated like a continuous fluid (Euler approach) and for the disperse phase the equation of motion is solved!

But there are some things, that are unclear to me:

(1) What forces are considered in the equation of motion for the droplets?

(2) What kind of basic equations for the continuous phase are solved?

(3) How are the two phases coupled? Is there just an influence of the continuous phase on the disperse phase or vice-versa or both??

(4) What equation are solved first - the continuous or disperse phase??

(5) The equations for droplets are solved every timestep?? ( I read, that it is common to solve the equations for the disperse phase just every 5...10th timestep)

(6) Does turbulence influences the motion of the doplets??

It would be great if someone could help me??

Thanks, Michael

huoyinghw · July 22, 2009, 23:24

Quote:

Originally Posted by farbfilm

Hi,

does anybody have some literature or documentation for the dieselFoam solver??

For my thesis, I have to know the basics how the Euler/Lagrangian approach is realized in OpenFoam!!

What I already know is the basic idea of this approach - the gasphase is treated like a continuous fluid (Euler approach) and for the disperse phase the equation of motion is solved!

But there are some things, that are unclear to me:

(1) What forces are considered in the equation of motion for the droplets?

(2) What kind of basic equations for the continuous phase are solved?

(3) How are the two phases coupled? Is there just an influence of the continuous phase on the disperse phase or vice-versa or both??

(4) What equation are solved first - the continuous or disperse phase??

(5) The equations for droplets are solved every timestep?? ( I read, that it is common to solve the equations for the disperse phase just every 5...10th timestep)

(6) Does turbulence influences the motion of the doplets??

It would be great if someone could help me??

Thanks, Michael

Hi alls,
i also want to know the answers that Michael has asked.
Does anyone have any idea?
Thank you, huoyinghw

henrik · July 23, 2009, 03:46

Dear KIVA-converts,

you can download Niklas's thesis here:

http://powerlab.fsb.hr/ped/kturbo/OpenFOAM/docs/NiklasNordinPhD.pdf

There is also "fresh" material that came out of the PhD course at Chalmers:

http://www.tfd.chalmers.se/~hani/kurser/OS_CFD_2008

and Berhard's contribution: icoLagrangian

http://openfoamwiki.net/index.php/Co...LagrangianFoam

please consult the associated threads on this forum when running into trouble.

Guess this will keep you busy for a while

Henrik

anfho · November 9, 2010, 18:18

Dear All,
I also would like to run the aachenBomb, but on OF1.5. However, in the tutorial folders, the input files for that turorial are missing...
I downloaded OF1.7.1 and all of the required aachenBomb input files are there. Is it possible to use these input files and run it on OF1.5?
Thanks! Andreas

anfho · November 10, 2010, 14:51

Nope, it is not working. But here is the link where to download the old tutorials:

http://sourceforge.net/projects/foam/files/

Regards, Andreas

enjoybitter · May 3, 2012, 02:23

I am new to OpenFOAM.
Could you please tell me what is AACHENG BOMB?

Is there any reference?

June 27, 2005, 07:42	Hi there, I'd like to simul	#1
jean_kuebbeler New Member Jean Kübbeler Join Date: Mar 2009 Location: Aachen, NRW, Germany Posts: 2 Rep Power: 0	Hi there, I'd like to simulate diesel spray and ignition for my diploma thesis beeing part of a cold start project. Where can I get information, like recent thesis, on creating a model in Open Foam. Is Aachen Bomb the right solver. And what are the differences to the KIVA solver. Thank you. Sincerely, Jean

June 27, 2005, 10:32	Hey, The aachenBomb case us	#2
niklas Super Moderator Niklas Nordin Join Date: Mar 2009 Location: Stockholm, Sweden Posts: 693 Rep Power: 29	Hey, The aachenBomb case use the dieselFoam application, you have mixed up your terminology there slightly. Since I started with KIVA and was part of developing the dieselFoam application I know what the important differences are 1. KIVA solves for internal energy, dieselFOAM - enthalpy. 2. The spray models in KIVA are all available in the dieselSpray class (although turbulent dispersion is handled slightly different) 3. The chemistry/combustion in KIVA is a bit tediuous to use and the standard chemistry solver is not very good for larger mechanisms. The chemistry in dieselFoam is based on the CHEMKIN approach and use a correct stiff ODE solver. The chemistryModel in OpenFOAM has the option to solve chemistry as KIVA does (sequential), but I do not recommend anyone using it, since it was implemented just for direct comparison between KIVA/OpenFOAM. Further, the combustion model in dieselFoam is hard-coded and is based on Chalmers Partially Stirred Reactor model. You should be able to run any KIVA case (not using valves) in OpenFOAM using the kivaToFoam converter. N

June 28, 2005, 05:00	Thanks for the fast answer. I	#3
jean_kuebbeler New Member Jean Kübbeler Join Date: Mar 2009 Location: Aachen, NRW, Germany Posts: 2 Rep Power: 0	Thanks for the fast answer. I am now looking for good literature (for beginners) about the dieselFOAM application. See you, Jean

July 23, 2009, 03:46		#6
henrik Senior Member Henrik Rusche Join Date: Mar 2009 Location: Wernigerode, Sachsen-Anhalt, Germany Posts: 281 Rep Power: 18	Dear KIVA-converts, you can download Niklas's thesis here: http://powerlab.fsb.hr/ped/kturbo/OpenFOAM/docs/NiklasNordinPhD.pdf There is also "fresh" material that came out of the PhD course at Chalmers: http://www.tfd.chalmers.se/~hani/kurser/OS_CFD_2008 and Berhard's contribution: icoLagrangian http://openfoamwiki.net/index.php/Co...LagrangianFoam please consult the associated threads on this forum when running into trouble. Guess this will keep you busy for a while Henrik ramakant, Prasque and amolrajan like this.

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April 14, 2009, 05:51		#4
farbfilm Member Michael Join Date: Mar 2009 Posts: 48 Rep Power: 17	Hi, does anybody have some literature or documentation for the dieselFoam solver?? For my thesis, I have to know the basics how the Euler/Lagrangian approach is realized in OpenFoam!! What I already know is the basic idea of this approach - the gasphase is treated like a continuous fluid (Euler approach) and for the disperse phase the equation of motion is solved! But there are some things, that are unclear to me: (1) What forces are considered in the equation of motion for the droplets? (2) What kind of basic equations for the continuous phase are solved? (3) How are the two phases coupled? Is there just an influence of the continuous phase on the disperse phase or vice-versa or both?? (4) What equation are solved first - the continuous or disperse phase?? (5) The equations for droplets are solved every timestep?? ( I read, that it is common to solve the equations for the disperse phase just every 5...10th timestep) (6) Does turbulence influences the motion of the doplets?? It would be great if someone could help me?? Thanks, Michael

November 9, 2010, 18:18		#7
anfho Member Join Date: Sep 2010 Posts: 36 Rep Power: 15	Dear All, I also would like to run the aachenBomb, but on OF1.5. However, in the tutorial folders, the input files for that turorial are missing... I downloaded OF1.7.1 and all of the required aachenBomb input files are there. Is it possible to use these input files and run it on OF1.5? Thanks! Andreas

November 10, 2010, 14:51		#8
anfho Member Join Date: Sep 2010 Posts: 36 Rep Power: 15	Nope, it is not working. But here is the link where to download the old tutorials: http://sourceforge.net/projects/foam/files/ Regards, Andreas

May 3, 2012, 02:23		#9
enjoybitter New Member Wang Join Date: Sep 2010 Posts: 6 Rep Power: 15	I am new to OpenFOAM. Could you please tell me what is AACHENG BOMB? Is there any reference?