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January 13, 2006, 09:52 
If you havent passsed 66 CAD

#21 
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Niklas Nordin
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If you havent passsed 66 CAD you shouldnt have any combustion yet.
do you have any fuel? 

January 13, 2006, 09:56 
with the wedge geometry I run

#22 
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stefan
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with the wedge geometry I run my simulation from 180 to 180 CA. Fuel is also injected and the temperatures are high enough so combustion process should take place!?!


January 13, 2006, 10:29 
did you set chemistry on in ch

#23 
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Niklas Nordin
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did you set chemistry on in chemistryProperties?
If it doesnt burn you reactions are too slow. That means that its either turned off or that the reaction rate constant in chem.inp is too low. 

January 13, 2006, 10:38 
Niklas,
yes chemistry is on

#24 
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stefan
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Niklas,
yes chemistry is on! combustionProperties:  chemistry on; chemistrySolver ODE; //chemistrySolver EulerImplicit; //chemistrySolver sequential; initialChemicalTimeStep 1.0e7; sequentialCoeffs { cTauChem 1.0e3; } EulerImplicitCoeffs { cTauChem 5.0e2; equilibriumRateLimiter off; } ODECoeffs { ODESolver SIBS; eps 5.0e2; scale 1.0; } I tried the the single step mechanism (chem.inp1) and chem.inp_15 delivered from the dieselFoam tutorial. I think the reation rates of this schemes should be ok or not? 

January 16, 2007, 06:42 
Hi,everyone
Now I try to se

#25 
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Hi,everyone
Now I try to setup dieselEngineFoam. It seems that there is no definition about injection timing in dieselFoam. Where and How should I define it? 

January 16, 2007, 06:46 
Hi,everyone
Now I try to se

#26 
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Hi,everyone
Now I try to setup dieselEngineFoam. It seems that there is no definition about injection timing in dieselFoam. Where and How should I define it? 

May 17, 2007, 02:07 
Is there anybody who can help

#27 
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Is there anybody who can help me ??
Atsushi 

June 17, 2007, 23:22 
I run dieselEngineFoam of OF 1

#28 
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I run dieselEngineFoam of OF 1.3.
I got this error message. > FOAM FATAL IO ERROR : keyword cyclics is undefined in dictionary "/home/nishio/OpenFOAM/nishio1.3/run/tutorials/dieselEngineFoam14/cyclic_test/ 180/p::boundaryField" file: /home/nishio/OpenFOAM/nishio1.3/run/tutorials/dieselEngineFoam14/cyclic_test/1 80/p::boundaryField from line 31 to line 45. From function dictionary::lookupEntry(const word& keyword) const in file db/dictionary/dictionary.C at line 152. this is dieselEngineFoam/test/180/p. dimensions [ 1 1 2 0 0 0 0 ]; internalField uniform 100000; boundaryField { piston { type zeroGradient; } liner { type zeroGradient; } cylinderHead { type zeroGradient; } cyclics... { type zeroGradient; } } What is wrong? Please tell me. thanks. 

June 17, 2007, 23:31 
You have either messed up the

#29 
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Hrvoje Jasak
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You have either messed up the brackets or have hidden Microsoft endline characters (CtrlM) in the bit which says
cylinderHead { type zeroGradient; cyclics... { type zeroGradient; } } By the way, what are those dots after "cyclics"? As a consequence, the solver cannot find the bit that says "cyclics" to locate the subdictionary. There may be other things wrong as well, e.g. the boundary condition type on the cyclic boundary should be "cyclic", but the code will tell you what it thinks. Good luck, Hrv
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June 29, 2007, 05:31 
I run dieselEngineFoam of tuto

#30 
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I run dieselEngineFoam of tutorials.
Below,I show log dieselEngineFoam. No Iterations of rho is 0. what happen? Why this result occured? Please teach me. thanks. Number of parcels in system  2441 Injected liquid mass.......  0.585093 mg Liquid Mass in system......  0.556518 mg SMD, Dmax..................  8.04166 mu, 144.482 mu Added gas mass = 0.0285751 mg Evaporation Continuity Error 1.50067e09 mg ExecutionTime = 1403.97 s ClockTime = 1405 s Mean and max Courant Numbers = 6.06171e05 0.0998279 deltaT = 4.11218e08 Crank angle = 14.8499 CAdeg deltaZ = 8.26244e08 clearance: 0.00709141 Piston speed = 2.00926 m/s Solving chemistry diagonal: Solving for rho, Initial residual = 0, Final residual = 0, No Iterati ons 0 BICCG: Solving for Ux, Initial residual = 0.00112271, Final residual = 6.95297e 08, No Iterations 1 BICCG: Solving for Uy, Initial residual = 0.00110164, Final residual = 8.77127e 07, No Iterations 1 BICCG: Solving for Uz, Initial residual = 0.00131305, Final residual = 2.67449e 07, No Iterations 1 BICCG: Solving for C7H16, Initial residual = 0.00252406, Final residual = 3.952 72e07, No Iterations 1 BICCG: Solving for O2, Initial residual = 0.00218811, Final residual = 3.20441e 07, No Iterations 1 BICCG: Solving for CO2, Initial residual = 0.00116516, Final residual = 1.68511 e07, No Iterations 1 BICCG: Solving for H2O, Initial residual = 0.00116516, Final residual = 1.68511 e07, No Iterations 1 BICCG: Solving for h, Initial residual = 0.000129235, Final residual = 2.90022e 08, No Iterations 1 ICCG: Solving for p, Initial residual = 0.0204819, Final residual = 3.29525e13 , No Iterations 2 diagonal: Solving for rho, Initial residual = 0, Final residual = 0, No Iterati ons 0 time step continuity errors : sum local = 3.65186e16, global = 2.63727e16, cum ulative = 4.27066e12 ICCG: Solving for p, Initial residual = 8.59685e05, Final residual = 2.52916e 10, No Iterations 1 diagonal: Solving for rho, Initial residual = 0, Final residual = 0, No Iterati ons 0 time step continuity errors : sum local = 2.56815e13, global = 7.56819e15, cum ulative = 4.27823e12 BICCG: Solving for epsilon, Initial residual = 0.000555864, Final residual = 6. 98831e08, No Iterations 1 BICCG: Solving for k, Initial residual = 0.000689, Final residual = 1.17105e07 , No Iterations 1 Mean pressure:3.45583e+06 Mean temperature:914.791 Mean u':2.51441 

July 19, 2007, 04:32 
Hello,
I try to setup diese

#31 
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Hello,
I try to setup dieselEngineFoam. Now I don't understand amethod to "merge" the two cases to get a setup for the dieselEngine solver. I want you to teach it in detail. Thanks if you can help. tanaka 

July 20, 2007, 03:08 
Hi Tanaka,
You should check

#32 
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Hi Tanaka,
You should check old log ↓↓ In Preprocessing/FoamX/dieselEngineFoam Good luck! Atsushi 

July 26, 2007, 08:17 
Atsushi,
Thanks a lot for y

#33 
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Atsushi,
Thanks a lot for your help. It's now working! 

September 3, 2007, 02:30 
Hi,
"0" folder in dieselFoa

#34 
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Hi,
"0" folder in dieselFoam , I can see "N2:0.766, O2:0.233" composition. What kind of fraction? Volume fraction or mass fraction? Thanks. Atsushi 

September 4, 2007, 11:10 
mass fraction.
the solvers di

#35 
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mass fraction.
the solvers dieselFoam use it in the equations: in createFields. Hfor(label i=0; i<Y.size(); i++) { fields.add(Y[i]); } in Yeqn solve ( fvm::ddt(rho, Yi) + mvConvection>fvmDiv(phi, Yi)  fvm::laplacian(turbulence>muEff(), Yi) == kappa*chemistry.RR(i), mesh.solver("Yi") ); which is the mass conservation equation for a specie i, implying mass fraction Yi Bruno 

September 5, 2007, 04:47 
Bruno,
Thanks for your quic

#36 
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Bruno,
Thanks for your quick answer! Atsu 

November 25, 2007, 08:38 
Hello,
I want to know Reyno

#37 
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Hello,
I want to know Reynolds number "Re" and viscosity "μ" of some cells per CA. I found "sampleDict" in stressedFoam/plateHole/system. Can I check "Re" and "μ" in dieselEngineFoam using sampleDict? Thanks. Atsu 

November 24, 2008, 09:01 
Hello Sir,
I am new OpenFOAM,

#38 
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Badiger Ramesh
Join Date: Mar 2009
Location: Bangalore, Karnataka, India
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Hello Sir,
I am new OpenFOAM, I am trying to implementing Eddy Dissipation Concept, Can any body tell whether it is already there in OpenFOAM1.5 or still to be implemented, And give me some guidelines to set up a basic combustion problem in OpenFOAM 

November 25, 2008, 09:22 
Hello Badiger,
I implemente

#39 
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Markus Rehm
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Hello Badiger,
I implemented it and have done a few test calculations but still it is not in a condition to be published. I hope to do that in a few weeks. I showed it at the Workshop in Milan this year. If you want to I can send you the slides. Regards, Markus. 

December 3, 2008, 03:25 
Thanks Markus,
Please send,

#40 
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Badiger Ramesh
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Thanks Markus,
Please send, I ll go through, Can you guide me in implementing a combustion problm, a simple one, some start ups i have already started with it, but stucking in writing chem.inp file requiring values of Activation energy etc.. for different fuels Plz do the needful 

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