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Want to change value of g during case running. i.e after 3 seconds

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Old   March 22, 2015, 01:50
Post Want to change value of g during case running. i.e after 3 seconds
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Muhammad Usman
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i want to apply value of g in a different way. i want to change value of g after half of endTime. Is there any way to do that???? i tried if else statement but it doesnt work and terminates with this error
--> FOAM FATAL IO ERROR:
"ill defined primitiveEntry starting at keyword 'if' on line 19 and ending at line 28"

file: /home/usman/OpenFOAM/project2D/constant/g at line 28.

From function primitiveEntry::readEntry(const dictionary&, Istream&)
in file lnInclude/IOerror.C at line 132.

FOAM exiting
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Old   March 22, 2015, 02:15
Post Help required. i want to change value of g after half of endTime
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Muhammad Usman
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hye i want to change value of g after half of endTime. i did the following changes in g file



/*--------------------------------*- C++ -*----------------------------------*\
| ========= | |
| \\ / F ield | OpenFOAM: The Open Source CFD Toolbox |
| \\ / O peration | Version: 2.1.1 |
| \\ / A nd | Web: www.OpenFOAM.org |
| \\/ M anipulation | |
\*---------------------------------------------------------------------------*/
FoamFile
{
version 2.0;
format ascii;
class uniformDimensionedVectorField;
location "constant";
object g;
}
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
dimensions [0 1 -2 0 0 0 0];
double B;
value (B -9.81 0)

if (runTime.timeName() < ( endTime / 2)) {B = 0}
else
{B = 15};

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



but the error was

Reading g


--> FOAM FATAL IO ERROR:
wrong token type - expected Scalar, found on line 19 the word 'B'

file: /home/usman/OpenFOAM/project2D/constant/g.value at line 19.

From function operator>>(Istream&, Scalar&)
in file lnInclude/Scalar.C at line 93.

FOAM exiting


please help me how can i do that
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Old   March 22, 2015, 02:40
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Muhammad Usman
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hello foamers i also have a similer problem.
i just want to do this

double B;
value (B -9.81 0)

if (runTime.timeName() < ( endTime / 2)) {B = 0}
else
{B = 15;}




please tell me how to do this. i am new in openfoam and programming
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