Hello,
I intend to use RT elements for my fluid flow problem and the test case 
(2D) is shear flow. Consequently the I need to apply constant shear/sliding 
velocity (u_x = shear_velocity, u_y = 0) at top and bottom boundaries and 
velocities of form u_y = 0, u_x = y*shear_velocity for the right and left 
boundaries. I came across the function 
VectorTools::project_boundary_values_div_conforming 
<https://www.dealii.org/developer/doxygen/deal.II/group__constraints.html#ga86427a4e8b3a7e580dabb4e473005288>
 
() that helps to apply inhomogeneous dirichlet bcs but only in the normal 
direction (normal to boundary face), but what I also intend to do is apply 
dirichlet bcs for non-normal component (i.e. for u_x at top and bottom 
boundary) for RT elements. Is there any way out?

Please note that we can not simply use 
VectorTools::interpolate_boundary_values() for RT elements. Previous 
discussion on this topic - here. 
<https://groups.google.com/forum/#!topic/dealii/vdFQFvJx5KY>

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