[duan]

Hi,

I am trying to set different writeTimeInterval rather than a constant one during the runTime.

for example:
if (currentRunTime<t0)
writeTimeInterval=value0;
else
writeTimeInterval=value1;

Now I have problems on how to get current time within the controlDict.

Here is my code:

writeInterval   #codeStream
{
    
    code
    #{
        /*// the sample works    
          scalar start = readScalar(dict.lookup("startTime"));
          scalar end = readScalar(dict.lookup("endTime"));
          label nDumps = 5;
          os << ((end - start)/nDumps);*/
        //==================================================
        //how to get the current time within controlDic???
          
          //Tried but Not work
          //scalar t=this->db().time().value(); 
          //error: invalid use of ‘this’ in non-member function
         
          //scalar t = runTime().value() ; 
          //error: ‘runTime’ was not declared in this scope
          //scalar t = timeDirs.last().value(); 
          //error: ‘timeDirs’ was not declared in this scope
          //scalar t = time().value(); 
          //error: too few arguments to function ‘time_t time(time_t*)
          label t0 = 0.4;
          if (t <= t0) {
                os << 0.05;
          }
          else {
                os << 0.02;
          } 
    #};
};

I also have found some post related:
http://www.cfd-online.com/Forums/ope...ntroldict.html
http://www.openfoam.org/version2.0.0...me-control.php
http://www.cfd-online.com/Forums/ope...me-scalar.html


Thanks in advance.

[alexeym]

Hi,

you'd like just to update writeInterval, depending on current time, you can create controlDict_1 with writeInterval_1, controlDict_2 with writeInterval_2 and use timeActivatedFileUpdate like below:

functions
{
    fileUpdate1
    {
        type            timeActivatedFileUpdate;
        functionObjectLibs ("libutilityFunctionObjects.so");
        outputControl   timeStep;
        outputInterval  1;
        fileToUpdate    "$FOAM_CASE/system/controlDict";
        timeVsFile
        (
            (-1    "$FOAM_CASE/system/controlDict_1")
            (10    "$FOAM_CASE/system/controlDict_2")
        );
    }
}

I.e. take your controlDict, put code snippet there, copy it to coltrolDict_1 and controlDict_2, modify writeInterval settings in controlDict_* and that's it.

[duan]

Hi, @alexeym

Thanks for your quick reply.

It works.

[duan]

For alternative,

I also wrote a script, to run the case in 3 steps:
0=>t1 ,with write time interval WI1
t1=>t2 ,with write time interval WI2
t2=>t3 ,with write time interval WI3

It's not a very good solution, but works.
If someone is interested, see the attached file.

[canopus]

Does any one know how to get

scalar t = runTime().value

in controldict to modify the writeinterval using

writeInterval #codeStream

?

I am getting the same error as reported here

system/controlDict.#codeStream:40:13: error: ‘runTime’ was not declared in this scope

[Tobi]

It's more like:

scalar t = U.runTime().value();

You only can call runTime().value() with an object. Or maybe with the Namespace::

[CarlesCQL]

Hi Tobi,

I tried

 scalar t = U.runTime().value();

and I get:

 error: ‘U’ was not declared in this scope

I searched for this topic a lot in this forum but I didn't found any solutions.

Can you elaborate a little more about that and the namespace option?

Thanks!

[aerogt3]

Originally Posted by CarlesCQL

Hi Tobi,

I tried

 scalar t = U.runTime().value();

and I get:

 error: ‘U’ was not declared in this scope

I searched for this topic a lot in this forum but I didn't found any solutions.

Can you elaborate a little more about that and the namespace option?

Thanks!

Did you ever figure this out?

[Diro7]

Originally Posted by aerogt3

Did you ever figure this out?

I didn't try myself, but you should be able to access the mesh database, and then the simulation time with something like

db().time().value()

where db() is a call from a objectRegistry object.

In the codeStream documentation (https://cpp.openfoam.org/v6/classFoa...m.html#details) there should be an example on how to access the database from within a codeStream instance:

someEntry  #codeStream
{
    code
    #{
        const IOdictionary& d = static_cast<const IOdictionary&>(dict);
        const fvMesh& mesh = refCast<const fvMesh>(d.db());

        ...
    #};
};

I guess you don't need to explicitly use namespaces or to link other libraries, but still I didn't try. Just try to put together the pieces and see if it works

Andrea

[Tobi]

If you call db() you need an object. It is the same as with U.time().value(). U is an object of e.g., volVectorField.

It is not possible to just call db().time().value(). Probably this works:

this->db().time().value();

Depending if »this« is a pointer or a reference you have to choose the point ».« operator or the other one »->«.

[Diro7]

Originally Posted by Tobi

If you call db() you need an object. It is the same as with U.time().value(). U is an object of e.g., volVectorField.

It is not possible to just call db().time().value(). Probably this works:

this->db().time().value();

Depending if »this« is a pointer or a reference you have to choose the point ».« operator or the other one »->«.

You are definitely right, my answer was a little ambiguous.
If you already have some object U like a volScalarField, then it is much easier to just call U.db().

If not, this->db() may do the job in general but since I wasn't sure about what is returned by this in a codeStream context, my suggestion was to look at the documentation and see how to retrieve the simulation database from the current dictionary.

Andrea

[Tobi]

Does not fit 100 % but here is something similar.


https://www.youtube.com/watch?v=cvWaXBnEz1U&t=1095s

[sh.yu]

Hi,

I meet the same issue here.

Does anyone know how to get the current time in the controlDict via codeStream?