[doppler28]

Hello , i am using openfoam to solve two poisson equations(Naviers-stokes and Megnetic equation ) and i need to implement robin boundary condition using GroovyBC for the the induced magnetic field(Bi) in my 0 file i have for Bi

    upperWall
{
 type groovyBC;
 variables "k=1;alpha=0.01;f=1/(1+k/(alpha*mag(delta())));";
 valueExpression "vector(0,0,0)";
 gradientExpression "vector(0,0,0)";
 fractionExpression "f";
 value uniform (0 0 0);
}

and for some reason i get the error :

Starting time loop
Courant Number mean: 0 max: 0
smoothSolver:  Solving for Ux, Initial residual = 0, Final residual = 0, No Iterations 0
smoothSolver:  Solving for Uy, Initial residual = 1, Final residual = 8.33843e-06, No Iterations 14
swak4Foam: Allocating new repository for sampledGlobalVariables
--> FOAM Warning : 
    From function ConcretePluginFunction<DriverType>::exists
    in file lnInclude/ConcretePluginFunction.C at line 116
    Constructor table of plugin functions for PatchValueExpressionDriver is not initialized


--> FOAM FATAL ERROR: 
 Parser Error for driver PatchValueExpressionDriver at "1.1" :"field f not existing or of wrong type"
"f"
  ^
--|

Context of the error:


- From dictionary: /home/cfdlab/OpenFOAM/cfdlab-4.1/run/initialmhdFoam/Hunt/Ha_500/0/Bi.boundaryField.lowerWall
  Evaluating expression "f"


    From function parsingValue
    in file lnInclude/CommonValueExpressionDriverI.H at line 1246.

FOAM exiting

does anyone have any ideas why it doesn't accept my fractionExpression f??

[ancolli]

I do not know, but... did u try to put your variables in the following way?

   
upperWall
{
 type                      groovyBC;
 valueExpression     "vector(0,0,0)";
 gradientExpression "vector(0,0,0)";
 fractionExpression  "f";
 value                     uniform (0 0 0);
 variables	
		(
			"k=1;"
			"alpha=0.01;"
                        "f=1/(1+k/(alpha*mag(delta())));"
		);
}