[silviliril]

I came to know that lookup table feature in groovyBC is only applicable for 1D data. e.g. Position of X axis and corresponding Temperate values can be given easily with lookup table.

For, 2D data, we need to user interpolation2DTable feature under codedMixed boundary condition. I need to provide temperature only on certain provided coordinates on heated wall patch. Means I have to provide (X Y T) data on my wall.

I have written following boundary condition after reading another post from cfd-online.

bottom
   {
	type codedMixed;
	refValue uniform 373.15;
	refGradient uniform 0;
	valueFraction uniform 0;
	redirectType lookupHeatFluxBC;

	codeInclude
	#{
	#include "interpolation2DTable.H"
	#};

	code
	#{

	// Construct interpolation2DTable 
	fileName fName = "$FOAM_CASE/temp.dat";
	Foam::interpolation2DTable<scalar> lookupTableData(fName);

	// Example lookup values
	scalar lookupVal1 = 0.001;
	scalar lookupVal2 = 374;

	// Set variable gradient field
	// Looks up as-> lookupTableData(row,col) in tableData.dat
	this->refGrad() = lookupTableData(lookupVal1,lookupVal2);

	#};

   }

and lookup table is something like this:

(
(0.0001	((0.0001 374) (0.0002 375)))
(0.0002	((0.0001 378) (0.0002 376)))
)

where decimal values represents the X and Y coordinates in meters and 374 represents temperature value in Kelvin.

But, I am getting some erratic results, it is not applying the temperature spatially as I asked for, instead it is applying temperature (that too erratic) with time. What can be the issue? Where am I making mistake?