If I know one cell in the fluent ,how to find some other neigbor cell of it .
 

In Fluent I write the UDF of the energy function,I Have the problem below:
1) I want to iterate the temperature ,so the temperature need to change with the new one in every cell , if I set the cell the temperature want to renew , I must know the temperature of neighber cell , so my problem is how to find the neighber cell through the function .
2) I write a steady energy funtion and have no source, now I have write the convection term and diffusion term and how to use it to complete the function, the gird is unstruction so I write it use the common function.