CFD Online Discussion Forums - Jet spray simulation, which solver we have to use

CFD Online Discussion Forums (https://www.cfd-online.com/Forums/)

- Main CFD Forum (https://www.cfd-online.com/Forums/main/)

- - Jet spray simulation, which solver we have to use (https://www.cfd-online.com/Forums/main/213210-jet-spray-simulation-solver-we-have-use.html)

Jet spray simulation, which solver we have to use

The jet is pressed through a cylindrical nozzle of a length of 70 mm and an
inner diameter of 1 mm. Afterward, it expands in initially quiescent air of atmo-
spheric pressure. The jet consists of a Helium/Nitrogen mixture of a density of 0.31 kg/m3. The velocity at the nozzle outlet is approximately 200 m/s. Both
the air and the jet are of a temperature of T = 293 K. How we can determine the velocity and mass fraction fields?

You just need to use the species transport model. Other than that, nothing fancy here and just about any solver settings will work.

confused to use solver in open foam

I appreciate your reply LuckyTran, but I'm sorry for not mentioning OpenFoam in my question. Could you please suggest a solver for that solving that situation and how can determine the velocity and mass fractions?

Use a solver with a YEqn.H. Try reactingFOAM

The velocity is the U field and mass fraction is Y field. You don't have to do any advanced post-processing to get them. If you can setup the case properly in OpenFOAM, they are right there.

error after replacing the components using reacting foam

I'm not sure what went wrong, can some one help....
Thanks in advance

Code:

Selecting combustion model laminar<psiChemistryCombustion>

Selecting chemistry type

{

    chemistrySolver EulerImplicit;

    chemistryThermo psi;

}



Selecting thermodynamics package

{

    type            hePsiThermo;

    mixture         reactingMixture;

    transport       sutherland;

    thermo          janaf;

    energy          sensibleEnthalpy;

    equationOfState perfectGas;

    specie          specie;

}



Selecting chemistryReader foamChemistryReader

--> FOAM Warning :

    From function entry::getKeyword(keyType&, Istream&)

    in file db/dictionary/entry/entryIO.C at line 80

    Reading C:/blueCFD-Core-2016/msys64/home/ofuser/jetspray/constant/reactions

    found on line 11 the punctuation token '{'

    expected either } or EOF





--> FOAM FATAL ERROR:

HE not found in table.  Valid entries:

5

(

N2

CO2

O2

CH4

H2O

)





    From function const T& Foam::HashTable<T, Key, Hash>::operator[](const Key&) const [with T = Foam::sutherlandTransport<Foam::species::thermo<Foam::janafThermo<Foam::perfectGas<Foam::specie> >, Foam::sensibleEnthalpy> >*; Key = Foam::word; Hash = Foam::string::hash]

    in file X:/OpenFOAM-4.x/src/OpenFOAM/containers/HashTables/HashTable/HashTableI.T.H at line 134.



FOAM exiting

Quick answer: Without being able to see the file "jetspray/constant/reactions", it's not possible for us to properly diagnose why this happened:

Quote:

Code:

found on line 11 the punctuation token '{'

    expected either } or EOF

The best we can tell you is exactly what the error message is telling you: You opened a bracket "{" but never closed it with another "}" somewhere else later.

Please follow the instructions given here, in order to make it easier for people to help you: https://www.cfd-online.com/Forums/op...-get-help.html

Hi Bruno, I've corrected it but now the simulation crashed. I don't know why. Could you please suggest what changes do I need to make.

The jet is pressed through a cylindrical nozzle of a length of 70 mm and an
inner diameter of 1 mm. Afterward, it expands in initially quiescent air of atmospheric pressure. The jet consists of a Helium/Nitrogen mixture of a density of 0.31 kg/m3. The velocity at the nozzle outlet is approximately 200 m/s. Both the air and the jet are of a temperature of T = 293 K. Discuss the resulting velocity and mass fraction fields.

I'm trying to solve it with reactingFoam by making the chemistry off and combustion as well. but the solution is getting crashed.
Attachment 67461 Attachment 67456

Attachment 67457

Attachment 67458

Attachment 67460

Attachment 67461

Quote:

Originally Posted by wyldckat (Post 719903)

Quick answer: Without being able to see the file "jetspray/constant/reactions", it's not possible for us to properly diagnose why this happened:

The best we can tell you is exactly what the error message is telling you: You opened a bracket "{" but never closed it with another "}" somewhere else later.

Please follow the instructions given here, in order to make it easier for people to help you: https://www.cfd-online.com/Forums/op...-get-help.html

Hey,

since you don't mention the error message, I assume you still have the same problem:

in your thermoPhysicalProperties.txt

Code:

foamChemistryThermoFile "$FOAM_CASE/constant/thermo.compressibleGas";

Looks like you are using the wrong file here. Could you change it to

Code:

foamChemistryThermoFile "$FOAM_CASE/constant/thermo";

(according to the name of the files you've posted)?

If the solver is crashing for another reason and you would like to get some help, you should consider posting at least the error message.

Cheers

RP

did,, still getting error

>thanks,, I did it, still getting error as shown

Code:

virothi@COOLTEK09 MINGW64 OpenFOAM-4.x ~/react

$ reactingFoam.exe

/*---------------------------------------------------------------------------*\

| =========                 |                                                 |

| \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox           |

|  \\    /   O peration     | Version:  4.x                                   |

|   \\  /    A nd           | Web:      www.OpenFOAM.org                      |

|    \\/     M anipulation  |                                                 |

\*---------------------------------------------------------------------------*/

/*   Windows 32 and 64 bit porting by blueCAPE: http://www.bluecape.com.pt   *\

|  Based on Windows porting (2.0.x v4) by Symscape: http://www.symscape.com   |

\*---------------------------------------------------------------------------*/

Build  : 4.x-ed69f631ce88

Exec   : C:/blueCFD-Core-2016/OpenFOAM-4.x/platforms/mingw_w64GccDPInt32Opt/bin/reactingFoam.exe

Date   : Dec 28 2018

Time   : 20:33:29

Host   : "COOLTEK09"

PID    : 6912

Case   : C:/blueCFD-Core-2016/msys64/home/ofuser/react

nProcs : 1

SigFpe : Enabling floating point exception trapping (FOAM_SIGFPE).

fileModificationChecking : Monitoring run-time modified files using timeStampMaster

allowSystemOperations : Allowing user-supplied system call operations



// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //

Create time



Create mesh for time = 0





PIMPLE: Operating solver in PISO mode



Creating reaction model



Selecting combustion model noCombustion<psiThermoCombustion>

Selecting thermodynamics package

{

    type            hePsiThermo;

    mixture         reactingMixture;

    transport       sutherland;

    thermo          janaf;

    energy          sensibleEnthalpy;

    equationOfState perfectGas;

    specie          specie;

}



Selecting chemistryReader foamChemistryReader





--> FOAM FATAL IO ERROR:

file "C:/blueCFD-Core-2016/msys64/home/ofuser/react/constant/Thermo" does not exist



file: C:/blueCFD-Core-2016/msys64/home/ofuser/react/constant/Thermo at line 1.



    From function Foam::IFstream& Foam::IFstream::operator()() const

    in file db/IOstreams/Fstreams/IFstream.C at line 188.



FOAM exiting

Quote:

Originally Posted by raumpolizei (Post 720258)

Hey,

since you don't mention the error message, I assume you still have the same problem:

in your thermoPhysicalProperties.txt

Code:

foamChemistryThermoFile "$FOAM_CASE/constant/thermo.compressibleGas";

Looks like you are using the wrong file here. Could you change it to

Code:

foamChemistryThermoFile "$FOAM_CASE/constant/thermo";

Quick answers:

raumpolizei's diagnose is unfortunately incorrect.
@virothi: Please undo the change that raumpolizei suggested.
Please re-adapt the tutorial case "combustion/reactingFoam/laminar/counterFlowFlame2D" to use the same chemical reactions you want to use.
Then compress the whole case, for example if the case is named "counterFlowFlame2D.modified", with the following command:

Code:

tar -czf counterFlowFlame2D.modified.tar.gz counterFlowFlame2D.modified
Then attach the file "counterFlowFlame2D.modified.tar.gz" to your next post.

My request here is because it's not clear what is the exact problem, because I'm not familiar with this solver.
The original error message indicated in post #5 is not clear on the origin of the problem, given that it's still listing an outdated list of chemical reactions. So it feels like there is more than one file in the "constant" folder... and this separate custom tutorial case should help divide the problems apart.