What are the boundary conditions at the outflow in this Navier-Stokes example?
I'm running and modifying this example http://sfepy.org/doc-devel/examples/navier_stokes/navier_stokes.html. I can't see any specific mention of boundary conditions at the outflow. It it using Neumann boundary conditions with sigma_nn=sigma_nt = 0?
On 08/23/2014 03:23 AM, Matthew Dornfeld wrote:
I'm running and modifying this example http://sfepy.org/doc-devel/examples/navier_stokes/navier_stokes.html. I can't see any specific mention of boundary conditions at the outflow. It it using Neumann boundary conditions with sigma_nn=sigma_nt = 0?
Yes, zero Neumann BC.
r.
Any idea how valid those boundary conditions are for flows through a channel?
On Saturday, August 23, 2014 3:42:31 AM UTC-4, Robert Cimrman wrote:
On 08/23/2014 03:23 AM, Matthew Dornfeld wrote:
I'm running and modifying this example http://sfepy.org/doc-devel/examples/navier_stokes/navier_stokes.html. I can't see any specific mention of boundary conditions at the outflow. It it using Neumann boundary conditions with sigma_nn=sigma_nt = 0?
Yes, zero Neumann BC.
r.
As a CFD ignorant I would say that if the channel is long enough and there is no back-flow, then what is at the end has not much influence. But I may be completely wrong :) Try asking at some CFD forum.
r.
On 08/23/2014 08:17 PM, Matthew Dornfeld wrote:
Any idea how valid those boundary conditions are for flows through a channel?
On Saturday, August 23, 2014 3:42:31 AM UTC-4, Robert Cimrman wrote:
On 08/23/2014 03:23 AM, Matthew Dornfeld wrote:
I'm running and modifying this example http://sfepy.org/doc-devel/examples/navier_stokes/navier_stokes.html. I can't see any specific mention of boundary conditions at the outflow. It it using Neumann boundary conditions with sigma_nn=sigma_nt = 0?
Yes, zero Neumann BC.
r.
participants (2)
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Matthew Dornfeld -
Robert Cimrman