[nsp82]

Hi all,

I am unable to open the aachenbomb case in Foamx (1.3). it says invalid application class dieselfoam..

I even recompiled the solvers... Kindly advice.

[mattijs]

FoamX only covers part of the solvers (and part of the utilities). Copy an existing dieselFoam case by hand and modify the dictionaries with an editor.

I use dieselFoam of tutorials.

I want to calcultate the spray wall impingement.
But, spray didn't impinge wall.
Even if the distance of wall was shorter.

Should I do? Please teach.

I use dieselFoam of tutorials.

I want to simulate the spray impingement wall.

But, spray didn't impinge the wall.even if the distance of wall was shorter.

Should I do ? please teach.

Hi. every one!

I use dieselFoam of OpenFOAM 1.3.

I want to change a value of initial density.
but I don't know how to change the value.

Which file I should change?

thank you.

[dhebert]

Hi Everyone,

I ran a simulation with dieselFoam in OpenFOAM 1.3. I have upgraded to OF 1.4.1 and am having a problem with the lagrangian/positions file. Anyone have ideas of how to fix?

Thanks,

David

######################################



Reading thermophysicalProperties
Selecting thermodynamics package hMixtureThermo<reactingmixture>
Selecting chemistryReader chemkinReader
Reading field U

Reading/calculating face flux field phi

Creating turbulence model.

Selecting turbulence model realizableKE
Creating field DpDt

Constructing chemical mechanism
Selecting ODE solver SIBS
chemistryModel::chemistryModel: Number of species = 3 and reactions = 0

Reading environmentalProperties
Reading combustion properties

Constructing Spray


--> FOAM FATAL IO ERROR : Expected a ')' while reading binaryBlock, found on line 27 the word '�ai?���>�'

file: /home/dhebert/OpenFOAM/dhebert-1.4.1/run/ShroudAbodyB/./0.153798/lagrangian/posi tions at line 27.

From function Istream::readEnd(const char*)
in file db/IOstreams/IOstreams/Istream.C at line 111.

FOAM exiting

[mattijs]

Binary lagrangian data reading is not downwards compatible; ascii is.

You can e.g. run one more time step and dump with writeFormat = ascii and try again.

[sunil]

I am a new user and have just installed OpenFoam-1.4.1 on PCLINUXOS 2007. I have tried several tutorials through FoamX as well as through console. They work fine except for aachenBomb. It does not work with FoamX (not a surprise as there are many postings on this forum talking about FoamX and dieselFoam). However in my case, it does not work with console also. I get the following error message:

FOAM FATAL ERROR : case "aachenBomb/" does not exist in root "/opt/OpenFOAM/caelinux-1.4.1/run"

FOAM exiting

However the aachenBomb does exist under the path mentioned above. Any help would be really appreciated.

[noriaki_nishio]

Hi All.

I simulate diesel Spray using dieselFoam tutorial.

I have one question. please teach me.

In rhoEqn.H , which file calculate evaporationSource(i) ? how to way calcutate?

Thank you!

[guanghaowu]

Hi, Noriaki

evaporationSource(i) is defined in
$FOAM_SRC/lagrangian/dieselSpray/spray/sprayl.H Line 149 (Version 1.5)

srhos_[] is calculated in
$FOAM_SRC/lagrangian/dieselSpray/parcel/parcel.C Line 288, 307

For more detail, please dig out the source code by yourself.

[noriaki_nishio]

Thank Guanqhao.

Hi All.

Just now, I attempt to add wall film model to dieselFoam solver.

Where, I'm bothering about mass flux to occur droplet splashing.
In dieselFoam solver, evaporationSource is calculated in

sDb.srhos()[i][celli]+=oMass[i]-nMass[i];

This code include wall film mass flux.

If you have some special idea abount this problem , I help me by Noriaki.

[seigi]

After ran the tutrorial case dieselFoam and foamToVTK under the OpenFOAM 1.5, I only got the directory 'VTK'->'lagrange'-> 'defautCloud'. There is no postion directory, Is it right? The spray result showed in paraFoam 3.3 using filting Glyph is weird.

[mattijs]

Try the 1.5.x git version (git://repo.or.cz/OpenFOAM-1.5.x.git). There are some fixes in there relating to particle writing.

[seigi]

Thanks for your reply, could you give some details, cause I couldn't find the particles relate issue on OpenFOAM-1.5.x.git

[mattijs]

Sorry, was talking nonsense. Changes were to solidParticle which dieselFoam does not use anyway.

After running foamToVTK there will be indeed lagrangian/defaultcloud/defaultCloud_*.vtk files which each contain the position of the particles and all fields.

[noriaki_nishio]

I use dieselFoam solver .
When I run 2D case , I got error.
Please help.

--> FOAM FATAL IO ERROR :
patch type 'wall' not constraint type 'wedge'
for patch front of field p in file "/home/nishio/OpenFOAM/nishio-1.4.1/run/tutorials/dieselFoam_idea/caseA/0/p"

file: /home/nishio/OpenFOAM/nishio-1.4.1/run/tutorials/dieselFoam_idea/caseA/0/p::fron t from line 36 to line 36.

From function wedgeFvPatchField<type>::wedgeFvPatchField
(
const fvPatch& p,
const Field<type>& field,
dictionary& dict
)

in file fields/fvPatchFields/constraint/wedge/wedgeFvPatchField.C at line 104.

FOAM exiting

[sebastian_vogl]

Hello Noriaki,

could you please post your blockMeshDict and the pressure file with the boundary condition? That would make it easier to see the problem.

Yours,
Sebastian

[sebastian_vogl]

Hello Noriaki,

I think I have got some ideas for you to think about:

1. I can't figure out the geometry you want to create out of your blockMeshDict file so if you could be so nice and make a sketch of your geometry you want to create and where the inlet or outlet is or what exactly you want to simulate and post it here.

2. In your blockMeshDict you used the "wedge" type for the front and back. This boundary type is only used for axissymmetric bodies like cylinders and then you also need the wedge angle. Generally you create cylinders by defining a slice like a "piece of cake" and let it rorate around a axis. But I'm not sure whether you want to create a cylinder, as I don't understand your blockMeshDict. Generally you use the "empty" type, if you want to simulate a 2D case. For example: if you have got a hexaeder with the coordinates x,y,z and you are only intersted in the x-y plane , you specify all planes normal to the z-axis with the type "empty". In my opinion giving the "empty" type to an axis, as you did, is wrong, because the axis is no plane.

3. In your pressure file I see that you specified the front and back as "wedge" and the axis as "empty" like in the blockMeshDict. But these boundary types are so called "basic" types which only appear in the blockMeshDict and must not be used in any file of the 0/ folder. There you have to use the "primitive" and "derived" patch types (e.g "fixedValue", "fixedGradient"). I recommend that you read again chapter 5.2 (I think it is this one) in the UserGuide about boundary conditions.

I hope my hints were useful. Please post a sketch of your case (geometry and inlet outlet, etc) you want to simulate. Maybe I can help you creating an appropriate geometry.

With kind regards,
Sebastian Vogl

Hello

I want to see temperature increasing in the pipe
it is laminar flow...which solver I should use? any suggestion?

thanks

Emo

[sebastian_vogl]

Hello Emilian,

you could try rhoPimpleFoam. It is a transient solver for compressible, turbulent flows which can treat heat transfer. There's also a tutorial for that solver. In the OpenFoam UserGuide chapter 3.5 there are all standard solvers listed.

Best regards,
Sebastian