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Difference between setting a pressure under "Initial Values" vs "Inlet" nodes

Posted Jun 26, 2014, 2:44 p.m. EDT Computational Fluid Dynamics (CFD) 1 Reply

Zhen Zhao
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Hello all,

I am running a Laminar Flow, Stationary Study and have a domain with two inlets. I would like to set the initial pressure in both inlets to be X [Pa] before the simulation begins. Should this pressure value be specified under the "Initial Values" or "Inlet" node under Laminar Flow? What is the difference between the two nodes? Does the "Inlet" pressure specify what the pressure is IN the domain, whereas the "Initial Values" specify what the pressure is coming INTO the domain (i.e. at the inlets)?
1 Reply Last Post Jun 27, 2014, 3:47 a.m. EDT
Pieter Westerik
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Posted: 10 years ago Jun 27, 2014, 3:47 a.m. EDT
If you specify it at the initial values node, you specify the the pressure at t=0, this setting has no influence in a stationary study and no direct influence on the pressure at other times in a time dependent study, only as a starting point.

If you specify it at an inlet node, this condition will apply for all times in a time dependent study, and it will also apply in a stationary study.
If you specify it at the initial values node, you specify the the pressure at t=0, this setting has no influence in a stationary study and no direct influence on the pressure at other times in a time dependent study, only as a starting point. If you specify it at an inlet node, this condition will apply for all times in a time dependent study, and it will also apply in a stationary study.

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