  We consider active nematodynamics on deformable surfaces. Based on a
thermodynamically consistent surface Beris-Edwards model we add nematic
activity and focus on the emerging additional coupling mechanism between the
nematic field, the flow field and the curved surface. We analyse the impact of
the active nematic force at topological defects. Under the presence of
curvature all defects become active and contribute not only tangential forces
but also normal forces. This confirms the proposed role of topological defects
in surface evolution and provides the basis for a dynamic description of
morphogenetic processes.
