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/*!

  \page cs_user_source_terms-scalar_in_a_channel Examples of data settings for source terms with scalar in a channel

\brief Additional right-hand side source terms for scalar equations (user
 scalars and specific physics scalars) with  the \ref cs_user_source_terms
user-defined function.

\section loc_var_scal Local variables and initialization

\snippet cs_user_source_terms-scalar_in_a_channel.c st_meta

\section thermal_scalar_only Only apply to thermal scalar

\snippet cs_user_source_terms-scalar_in_a_channel.c thermal_scalar_only

\section func_body Function body

 Map required fields
\snippet cs_user_source_terms-scalar_in_a_channel.c map_fields

Compute bulk mean velocity
\snippet cs_user_source_terms-scalar_in_a_channel.c bulk_mean_velocity

Compute source terms; we want to impose a total flux of 1 Watt.
 \snippet cs_user_source_terms-scalar_in_a_channel.c scalar_st

*/
