|September 26, 2011, 06:52||
Periodic boundary in unsteady flow
Join Date: Sep 2011
Posts: 4Rep Power: 6
I want to simulate unsteady flow in a channel. The flow rate increases steadily in time. However, if you take a long enough channel, the flow is still fully developed unsteady flow, i.e. at every point in space, the velocity profile is the same as long as the pipe is long enough.
To do this I can either use a channel that is 40 diameters long or use a periodic boundary enabling me to use a small section of channel - so that the inlet and outlet are coupled. However, when I try to use periodic boundaries by /grid/modify-zones make periodic, the only option open to me is a constant mass flow - I want to specify a changing mass flow.
Without using periodic boundaries, I can do this by define/boundary condition/inlet then next to velocity I can input a specified profile. Is it possible to do the same for periodic boundaries?
Many thanks for any help with this.
|fluent, periodic boundary, profile boundary cond., time dependent, unsteady flow|
|Thread||Thread Starter||Forum||Replies||Last Post|
|Periodic boundary condition||Arif||FLUENT||2||January 17, 2014 07:48|
|periodic boundary conditions fro pressure||Salem||Main CFD Forum||21||April 10, 2013 00:44|
|periodic, unsteady, non-constant mass flow rate||Lee||FLUENT||42||October 5, 2011 15:20|
|problem about periodic boundary condition in Fluent||winnawinna||FLUENT||0||December 29, 2010 00:32|
|Outlet boundary conditions for unsteady flow||Bjorn B||Main CFD Forum||3||January 11, 2006 06:42|