[dybiusz]

Dear All,


First of all I would like to say hi to all of you since this is my very firs post here.


I began my journey with OpenFoam some time ago in order to simulate ramjet using reactingFoam solver. At this moment I do some test with very simple program where I try to ignite CH4 in volume of high temperature and the problem I struggle is time when this high temperature would be. I was able to set this volume like below


topoSetDict:


FoamFile
{
version 2.0;
format ascii;
class dictionary;
object topoSetDict;
}

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

actions
(
{
name ignitionCells;
type cellSet;
action new;

source sphereToCell;
sourceInfo
{
centre (-0.2 0.5 0);
radius 0.05;
innerRadius 0;
}
}
);


and



fvOptions :


FoamFile
{
version 2.0;
format ascii;
class dictionary;
location "constant";
object fvOptions;
}


fixedTemperature
{
type fixedTemperatureConstraint;

timeStart 50;
duration 10;
selectionMode cellSet;
cellSet ignitionCells;

mode uniform;
temperature 800;
}




Sphere is working , I have this 800K in place I want, problem is that I have this all the time , but I want it have only for 0.1s.


I guess the problem might be in my controlDict which look like:





FoamFile
{
version 2.0;
format ascii;
class dictionary;
location "system";
object controlDict;
}


application reactingFoam;

startFrom startTime;

startTime 0;

stopAt endTime;

endTime 3;

deltaT 0.01;

writeControl timeStep;

writeInterval 10;

purgeWrite 0;

writeFormat ascii;

writePrecision 6;

writeCompression off;

timeFormat general;

timePrecision 6;

runTimeModifiable true;

adjustTimeStep yes;

maxCo 0.4;



functions
{
#includeFunc Qdot;


}



Please help me with this problem.


Best regards,


Marcin

[mactone]

I think you should change the duration from 1 to 0.1.

fixedTemperature
{
type fixedTemperatureConstraint;

timeStart 50;
duration 10;
selectionMode cellSet;
cellSet ignitionCells;

mode uniform;
temperature 800;
}