# Problem with a pressure outlet BC

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 August 10, 2015, 04:42 Problem with a pressure outlet BC #1 New Member   Luca Pavan Join Date: Apr 2015 Posts: 4 Rep Power: 4 Hello everyone, i'm using OpenFOAM for an incompressible simulation of an external aerodynamic combined with the study of the intake system of a motorbike's fairing. I'm using PISO algorithm and i want to impose a BC of pressure outlet on a patch at the end of a channel connected to the fairing. I've used: p outlet1 { type fixedValue; value uniform 160.701; } U outlet1 { type inletOutlet; inletValue uniform (0 0 0); value \$internalField; } With these BC i've got divergence problem after 400 iteration, anyone can suggest any BC to impose? Thanks in advance.

 August 10, 2015, 05:38 #2 Senior Member   anonymous Join Date: Aug 2014 Posts: 203 Rep Power: 5 You should also use inletOutlet for the pressure if you are using it for the velocity

 August 10, 2015, 15:53 #3 New Member   Luca Pavan Join Date: Apr 2015 Posts: 4 Rep Power: 4 I've imposted that BC, but it still got has divergence problem. outlet1 p { type inletOutlet; inletValue uniform -160.701; value uniform -160.701; } outlet1 U { type inletOutlet; inletValue uniform (0 0 0); value \$internalField; }

 August 11, 2015, 05:49 #4 Senior Member   anonymous Join Date: Aug 2014 Posts: 203 Rep Power: 5 Are you sure of the inletValue of U?

 August 11, 2015, 05:54 #5 New Member   Luca Pavan Join Date: Apr 2015 Posts: 4 Rep Power: 4 What i want to do is to set on that patch the pressure, a value that i know, and when the simulation is converging extract the volumetric flow rate.

 August 11, 2015, 08:00 #6 New Member   Luca Pavan Join Date: Apr 2015 Posts: 4 Rep Power: 4 I'm using a K-omega SST turbolence model, I've seen that the residual that firstly diverge is the k. I report tha BC that i've used for outlet1 for k, omega and nut. outlet1 k { type inletOutlet; inletValue \$internalField; value \$internalField; } outlet1 nut { type calculated; value uniform 0; } outlet1 omega { type inletOutlet; inletValue \$internalField; value \$internalField; } Thanks in advance!

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