two questions about using the ANSYS Fluent
 

hi,
i have two questions about using the ANSYS Fluent :
1 . could i realize the dynamic mesh by my own code without smoothing/layering/remeshing? and what should i do?
when the deformation is too large, the remeshing method always doesn't work as the negtive volume ?
the delaunary graph mapping is an impressive apporach to handle this question according to some papers,
but how can i couple the powerful solver(fluent) and the notion of dynamic mesh? by udf?
2 . could the fluent calcucate different zones by different models in only one case?
the question is induced by the calculating the inner flow of a balloon.
inside the balloon, it is natural convection which is conducted by temperature, it can be calculated by density-based with ideal gas model; however, out the balloon, it is the flow canbe calculated by S-A or SST model by pressure-based models.
but the external and inner fluid effect each other by heat transfer of balloon shell.

thank you very much for your answers.
sincerely