In the Navier-Stokes equations, you can't prescribe the pressure on the boundary (or part of it). That's just not a physical thing, nor mathematically correct. The only thing you can prescribe is the traction, i.e., the normal component of the stress, which is given by
\mathbf t = (-\nu \nabla \mathbf u + pI) \mathbf n.
For example, you could ...
The GPU consists of several streaming multiprocessors.
Each SM has 64-96kB of shared memory that can be accessed by up to 1024-2048 threads. This shared memory allows these threads to communicate.
To communicate between SMs you must write to and read from the GPU's global memory, which is 4-32GB in size.
But it is best to think of your problem as consisting ...