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Hi Binghuan,
So far, I haven't been able to compile a working version of the solver which reflects changes in dyn21icfd.F however, I might be able to suggest a method for implementing a custom windkessel model, until the subroutine issue is figured out.Â
You can use uctrl1 in dyn21.F to update the value of load curves during the solution phase. In the subroutine you can read the output file of *ICFD_DATABASE_FLUX to get the variables needed for numerical integration of your custom equations and assign the result to the specified load curve.Â
I haven't used this myself for windkessel models but it might be worth having a look.