[C_Zhang]

Hello everyone, I'm new to FLUENT UDF and I'm facing a problem.The user manul said I can modify velocity using DEFINE_ADJUST.But the velocity modification is related to mass transfer rate in my model.Can I directly change the velocity within DEFINE_MASS_TRANSFER?
Like this:
DEFINE_MASS_TRANSFER(name, cell, thread, from_index, from_species_index, to_index, to_species_index)
{
/*define mass_transfer as mass transfer here*/
C_U(cell,thread)=mass_transfer;
}
I will be grateful for any of your help.