setup outlet boundary condition from steady state result
Dear all
In my steady state analysis inlet is pressure (specified value) and outlet is velocity ( known value). later I want to run transient analysis. In this case, I would like to use the outlet as a pressure which is derived from the result of steady state at the outlet . please help me How to setup this condition? Thank you |
This is simple - just define the outlet as a pressure boundary and give it the pressure value from your steady state analysis. When you run the transient simulation use the steady state run as an initial condition.
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I set inlet with velocity as a function of time and I set the outlet boundary condition as areaAve(Pressure)@outlet. I need to clarify the following basic questions. 1. Is it correct setting ?( I dont' know the pressure value at the outlet. note that I set initial velocity and pressure when t=0) 2. In my setting, is the areaAve(Pressure)@outlet means free pressure boundary condition? Thank you |
Do not specify the outlet as areaAve(Pressure)@Outlet! That is not going to work. You need to set it to a pressure value, probably just 0Pa.
What is a free pressure boundary condition? You have to set either the pressure or the velocity, and the other one is solved by the software. |
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just define the outlet as a pressure boundary and give it the pressure value from your steady state analysis can you please give one example I could not understand. How I can give the pressure value when the solution finishes steady state and start transient automatically? ( I may setup steady state and transient through configuration control ) Thank you |
This is in effect setting the outlet pressure to the average it was last iteration. I have no idea what this is going to do, but I suspect you will have problems converging.
Have a look at the tutorial examples of how outlet boundaries are meant to be defined. |
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