udf for linearly heated sidewalls in natural convection
 

Hi friends,
I am doing a work on natural convection in square cavities.
The boundary conditions are as follows............
Side walls(left and right) : linearly heated
Bottom wall : Hot
top wall : adiabatic
I am using UDF for implementing the linearly heated sidewalls......
But when I use the same program syntax for both side walls....I am not able to retrieve the desired results..............Can anyone please help me out on this?