[Kbshariff]

Hello, I want to implement a groovyBC on k field in a form of log law.

The BC is given in the figure attached herewith

I have an error when running from the BC

--> FOAM FATAL ERROR: 
 Parser Error for driver PatchValueExpressionDriver at "1.8-9" :"field Hh not existing or of wrong type"
" (log((Hh/z0))/log((zp+z0)/z0))*Iamb"

here is my BC

    inlet

	{
	type		groovyBC;
	variables	(
			"zp = pos().z;"
			"Hh = 50;"
			"Uin = 2.7;"	
			"z0 = 0.001;"
			"Iamb = 0.2;"
			"II = (log((Hh/z0))/log((zp+z0)/z0))*Iamb;"
			"k = 1.5*II*II*Uin*Uin;"
			);
	valueExpression	"k";
	}

I use the same BC in fluent as UDF it works but am having an error in implementing it in OF.
Thank you.

[tomf]

Hi,

My guess is that the syntax is incorrect as it only seems to read the first line.

Can you try this:

    inlet

	{
	type		groovyBC;
	variables	"zp = pos().z;
			 Hh = 50;
			 Uin = 2.7;	
			 z0 = 0.001;
			 Iamb = 0.2;
			 II = (log((Hh/z0))/log((zp+z0)/z0))*Iamb;
			 k = 1.5*II*II*Uin*Uin;";
	valueExpression	"k";
	}

Or this:

    inlet

	{
	type		groovyBC;
	variables	"zp = pos().z;Hh = 50;Uin = 2.7;z0 = 0.001;Iamb = 0.2;II = (log((Hh/z0))/log((zp+z0)/z0))*Iamb;k = 1.5*II*II*Uin*Uin;";
	valueExpression	"k";
	}

This is taken from the OpenFOAMwiki

[Kbshariff]

Hi, yes indeed the error is in declaration of variables,

I calculated the expression in the valueExpression as follows;

   {
     type            groovyBC;
     variables "H=50;z0=0.001;vel=2.7;amb=0.2;";
     valueExpression "1.5*pow((amb*(log(H/z0)/log(pos().z/z0)))*vel,2)";

   }

It works well so far, merci