CFD Online Logo CFD Online URL
www.cfd-online.com
[Sponsors]
Home > Forums > Software User Forums > OpenFOAM > OpenFOAM Running, Solving & CFD

Problem in dieselFoam

Register Blogs Members List Search Today's Posts Mark Forums Read

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
Old   July 6, 2006, 05:45
Default Dear all I have a problem in
  #1
New Member
 
saeid kheradmand
Join Date: Mar 2009
Posts: 13
Rep Power: 17
skherad is on a distinguished road
Dear all
I have a problem in dieselFoam(aachenBomb case). I could not predict the right place of autoignition(I think it should be in shear layer but in the simulations it is in front of spray tip). the setup is as follow:
openFoan: 1.1
geometry and mesh: 2d(30mm*100mm) , 80*120

chemistrySolver EulerImplicit(it is faster than ODE)
cTauChem 5.0e-2;
equilibriumRateLimiter off

combustionProperties
cmix 1.0



injectorType unitInjector;
unitInjectorProps
{
position (0.0001 0 0);
direction (1 0 0);
diameter 0.0002;
Cd 0.9;
mass 6e-06;
temperature 350;
nParcels 5000;

X
(
1.0
);

massFlowRateProfile
(
(0 5.4)
(0.00005 6.7)
(0.0001 6.55)
(0.00015 6.4)
(0.0002 5.8)
(0.00025 5.5)
(0.0003 5.75)
(0.00035 6.05)
(0.0004 6.1)
(0.00045 6.15)
(0.0005 5.75)
(0.00055 5.2)
(0.0006 5.1)
(0.00065 5)
(0.0007 4.8)
(0.00075 4.8)
(0.0008 4.5)
(0.00085 3.2)
(0.0009 3.2)
(0.00095 3.1)
(0.0010 3)
(0.00105 3.1)
(0.0011 3.2)
(0.00115 3.15)
(0.0012 2.2)
(0.00125 1.8)
);
}


sprayProperties
interpolationSchemes
{
U cellPointFace;
rho cell;
p cell;
T cell;
}

subCycles 2;

atomizationModel off;
includeOscillation yes;
breakupModel ReitzKHRT;
injectorModel hollowConeInjector;
collisionModel off;
evaporationModel standardEvaporationModel;
heatTransferModel RanzMarshall;
dispersionModel off;
dragModel standardDragModel;
wallModel reflect;
specConstAtomizationCoeffs
{
dropletNozzleDiameterRatio
(
0.4
);
sprayAngle
(
15
);
}

ReitzKHRTCoeffs
{
B0 0.61;
B1 40;
Ctau 1;
CRT 0.1;
msLimit 0.2;
WeberLimit 6;
}

trajectoryCoeffs
{
cSpace 1;
cTime 0.3;
}

standardDragModelCoeffs
{
preReFactor 0.166667;
ReExponent 0.666667;
ReLimiter 1000;
CdLimiter 0.44;
Cdistort 2.632;
}


RanzMarshallCoeffs
{
preRePrFactor 0.6;
ReExponent 0.5;
PrExponent 0.333333;
}

hollowConeInjectorCoeffs
{
dropletPDF
{
pdfType RosinRammler;

RosinRammlerPDF
{
minValue 1.00e-6;
maxValue 1.50e-4;

d
(
1.5e-4
);

n
(
3
);
}
exponentialPDF
{
minValue 1.0e-4;
maxValue 1.0e-3;

lambda
(
1.0e+4
);
}
}

innerConeAngle
(
0.0
);

outerConeAngle
(
15.0
);
}

reflectCoeffs
{
elasticity 0.9;
}


thermodynamicProperties;
thermoType hMixtureThermo<reactingmixture>;
CHEMKINFile "$FOAM_ROOT/$FOAM_CASE/chemkin/chem.inp";
CHEMKINThermoFile "$FOAM_ROOT/$FOAM_CASE/chemkin/therm.dat";

inertSpecie N2;
stoichiometricAirFuelMassRatio1 stoichiometricAirFuelMassRatio [0 0 0 0 0 0 0] 14.9207;
burntProducts1 burntProducts 1 28.5809
200 6000 1000
3.12297 0.00178679 -5.94666e-07 9.09361e-11 -5.12055e-15 -11005.6 5.04351
3.47795 0.000748332 -3.54025e-07 1.3343e-09 -8.05648e-13 -11072.3 3.29518
-10002.9
1.67212e-6 170.672;

liquidFuelComponents
(
C7H16
);

C7H16 C7H16 defaultCoeffs;


turbulenceModel kEpsilon;
turbulence on;
kEpsilonCoeffs
{
Cmu Cmu [0 0 0 0 0 0 0] 0.09;
C1 C1 [0 0 0 0 0 0 0] 1.44;
C2 C2 [0 0 0 0 0 0 0] 1.92;
C3 C3 [0 0 0 0 0 0 0] -0.33;
alphah alphah [0 0 0 0 0 0 0] 1;
alphak alphak [0 0 0 0 0 0 0] 1;
alphaEps alphaEps [0 0 0 0 0 0 0] 0.76923;
muLimiter on;
Lsgs Lsgs [0 1 0 0 0 0 0] 0.0002;

}

chem.inp:
I have tested all files in the code(OpenFOAM-1.1/applications/test/readCHEMKINIII/CHEMKINdata)
and some other files(in Dr Nordin Website and Dr Feng Tao papers).


questions
1-Is the Cmix=1.0 correct? (Dr Nordin recommanded other values in his thesis)
2-are the arrhenius rate coeficients correct in the chem.inp files in the code?
for example
chem.inp:
C7H16 + 11O2=>7CO2 + 8H2O 5.00E+8 0.0 15780.0
chem.inp 15:
C7H16 + 11O2=>7CO2 + 8H2O 1.00E+8 0.0 15780.0
(5.00E+8 or 1.00E+8)
3-is there any other mistakes?
Thank you for your time and consideration
Saeid
skherad is offline   Reply With Quote

Reply

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
DieselFoam spray thumthae OpenFOAM Running, Solving & CFD 98 December 24, 2014 16:55
Problem with chemkinReader in dieselFoam smehdi609 OpenFOAM Running, Solving & CFD 0 January 29, 2009 14:43
DieselFoam problem with Brookbs cygwin port leosding OpenFOAM Installation 4 August 12, 2006 05:51
Problem in dieselFoam skherad OpenFOAM Running, Solving & CFD 0 July 6, 2006 05:48
About dieselFoam tsjb00 OpenFOAM Running, Solving & CFD 3 August 16, 2005 17:59


All times are GMT -4. The time now is 08:34.