udf for solid solid interaction

Hi

 

I am simulating a three phase flow, and i want to write a udf  for solid solid interaction.
SYAMLAL OBREIN SYMMETRIC DRAG MODEL

I am facing two problems.

1) when i interpret udf, it shows me undeclared variable

line 19: l_col: undeclared variable

AND

`DEFINE_EXCHANGE_PROPERTY' used with too many (6) args

 

 

2) I dont know how to include radial distribution function in the udf

Can someone please point out the flaws and how to fix them

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