Get a user parameter defined in the GUI notebook.
To access a notebook-defined variable when defining boundary conditions, a callback function of the type of type cs_dof_func_t can be defined, such as the following (for a notebook variable named "t_inlet"):
Note that accessing the notebook value in the function aboe is done through the call to cs_notebook_parameter_value_by_name.
The callback function can then be assigned to the zone named "inlet" for variable "scalar1" in the usual way (in cs_user_boundary_conditions_setup):