UDF: Source terms

Novice

Hello all,

I am new to UDF programing in FLUENT. Can anybody help me in witing a UDF to create source terms based on the following equation:

Y = 103*e^(-0.0003)X.

Where Y stands for the no. of particles and X stands for the amount of dosage applied. The above equation represents the decay of particles after applying a particular dosage.

Please let me know the procedure to include this in a FLUENT simulation.

Thanks in advance