I am using cavitatingFoam solv
 

I am using cavitatingFoam solver and foamDataToFluent and doing the tutorial.

My foamDataToFluentDict contains

p 1
U 2
gamma 150.

The corresponding dat file has non-zero values but the problem is it adds a unit number 15 to the file.
sth like

(300 (150 15 1 0 0 3001 3000)(
))
(300 (1 1 1 0 0 1 3000)(

When I open it in fluent, I get an error in fluent

read_thread_data_section : invalid thread id 15

Now although I can go ahead and plot values without problem I would like to know where that comes from.

Please help. Thanks