• First simulations

We tried to simulate with a coarse mesh (only 10 cells in y direction) and we have the following results on the velocity field.
U(inlet) = 1E-4 m/s

 

It seems that in the middle of the domain, the fluid moves as a block but it is obvious that the mesh is not fine enough to precisely evaluate the Bingham profile.

• Simulation with refined mesh

In those simulations, we have used a mesh with 20 cells in y direction.  We can verify that the velocity field has the same appearance as before and that on the velocity vectors view at x=7m, we clearly see that the fluid moves as a block.