On 08/28/2018 08:07 AM, Jane Lee wrote:
I am trying to solve the equations in step-20 with inhomogeneous neumann bcs
on one of the boundaries and getting something very bizarre.
step-20 uses a mixed formulation in which both the pressure and the velocity
(in essence, the gradient of the pressure) are primary variables of the problem.
In cases like this, it is often unclear what exactly you mean when you say
"inhomogenous Neumann boundary conditions". Can you clarify what exactly you
mean there? Do you want to prescribe the velocity, the pressure, or the normal
derivative of the pressure (which equals the normal component of the velocity)?
Best
W.
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Wolfgang Bangerth email: bange...@colostate.edu
www: http://www.math.colostate.edu/~bangerth/
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