Dear Milad,
As discussed in the forum topic found here: Simulink, FAST v7.00.01a-bjj is not currently set up to support loading on the tower for a floating wind system. We are currently working on an updated version of FAST and HydroDyn. This version will include the option to include both tower and platform loading at the same time. You can either wait for this version or add the capability yourself. If I understand your post, you appear to be adding this capability yourself. As I see it, the steps required to do this would include:
*Modify the floating platform input file to include the tower section data from the fixed-bottom offshore input file (I see from your post that you have already done this).
*Modify the FAST_IO.f90 source file to read in the new tower section data. I see from your post that you’ve identified the correct section of code from CASE (2) of PtfmModel. You’ll need to copy this section of code and include it in CASE (3) of PtfmModel.
*Modify the remaining source code to apply the new tower section data to floating platforms.
I hope that helps.
Best regards,