# prescribing pressure Boundary Conditions IPCS

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 February 12, 2020, 04:12 prescribing pressure Boundary Conditions IPCS #1 New Member   Jack Tattersall Join Date: Jan 2020 Posts: 13 Rep Power: 6 Hello all, I have a very basic model of a pipe which is solved by the IPCS method. I want to have it pressure driven, however, I'm not sure how to set the BCs. My question basically is: if I want to model flow through a pipe and have it pressure driven, so I dont want to prescribe a flow. How can I implement this with when the NS equations are solved through the IPCS method. I dont know what BC to prescribe in the tentative velocity step or how this actually works. Thanks in advance! Cheers, Jack

February 12, 2020, 06:56
#2
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Filippo Maria Denaro
Join Date: Jul 2010
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Quote:
 Originally Posted by jacktat7 Hello all, I have a very basic model of a pipe which is solved by the IPCS method. I want to have it pressure driven, however, I'm not sure how to set the BCs. My question basically is: if I want to model flow through a pipe and have it pressure driven, so I dont want to prescribe a flow. How can I implement this with when the NS equations are solved through the IPCS method. I dont know what BC to prescribe in the tentative velocity step or how this actually works. Thanks in advance! Cheers, Jack

You should provide more details. Are you solving an incompressible flow problem, right? IPCS stands for incremental pressure correction I suppose.
If you have periodic condition in streamwise direction you can simply set a pressure forcing term in the momentum equation, the residual pressure is solved by the Poisson equation with periodic BCs. The flow rate is determined by the forcing term.

If you have an inflow/outflow sections you could set the pressure at inflow and outflow. If you don't know the flow rate and the inlet velocity profile that is the only way you can work.