Dear All,
I found a problem in my 2D comsol simulation when I am solving N-S equations in cylindrical coordinate. I use the creeping flow and neglect inertial. And I use P1+P1 discretization.
My solving geometry is shown in the attachment(First graph). The yellow line indicates the real boundaries of the system. Near the inner sphere boundary, I apply non-slip boundary condition. However, there is great body force just near the surface and it causes great oscillation of velocity right near the surface(second graph).
Therefore, I wonder is that possible to smooth this oscillation by giving multiply the body force by a decay facter(like step function) near the spherical surface just in the shaded region in first graph. However, I am not sure how to write this kind of decay function in 2D cylindrical coordinate near sphere surface. Could you please give me some suggestions?
Or any other suggestions to solve this oscillation?
Many Thanks!
Best,
Mechelle
I found a problem in my 2D comsol simulation when I am solving N-S equations in cylindrical coordinate. I use the creeping flow and neglect inertial. And I use P1+P1 discretization.
My solving geometry is shown in the attachment(First graph). The yellow line indicates the real boundaries of the system. Near the inner sphere boundary, I apply non-slip boundary condition. However, there is great body force just near the surface and it causes great oscillation of velocity right near the surface(second graph).
Therefore, I wonder is that possible to smooth this oscillation by giving multiply the body force by a decay facter(like step function) near the spherical surface just in the shaded region in first graph. However, I am not sure how to write this kind of decay function in 2D cylindrical coordinate near sphere surface. Could you please give me some suggestions?
Or any other suggestions to solve this oscillation?
Many Thanks!
Best,
Mechelle