Inlet outlet boundary conditions

aoliva

Is it possible to impose a constant pressure on the InOut surface?

Thanks for the help

Alex

Yes, you can impose a constant density value (so that pressure value using equation of state)

You can check all options that can be imposed in doc/xml_format/_FmtXML_InOut.xml
And more information can be found here: http://dual.sphysics.org/4thusersworkshop/data/_uploaded/PDF_Talks_4thWorkshop/Tafuni_Lisbon2018.pdf

aoliva

Thanks for your replay Alex.
I have already checked both the .xml file and the presentation of A. Tafuni, but I'm quite confused on how to properly apply a fixed value of density at the boundary.

On the .xml file I found this:

-----------------------------------------------------------------------------------------------------------------------------
Rhop definitions ***
Fixed Constant rhop
imposerhop mode="0" comment="Outlet rhop 0:Imposed fixed value, 1:Hydrostatic, 2:Extrapolated from ghost nodes (default=0)"
imposerhop
-----------------------------------------------------------------------------------------------------------------------------

For my understanding this is only the setting to enable fixed rhop at the boundary.
My question is what is the correct "missing" part of the code to impose the density.
I'm trying with some like that:

-----------------------------------------------------------------------------------------------------------------------------
imposerhop mode="0" comment="Outlet rhop 0:Imposed fixed value, 1:Hydrostatic, 2:Extrapolated from ghost nodes (default=0)"
rhop value="1517" comment="Characteristic inlet rhop (default=1000)" units_comment="kg/m^2"
imposerhop
-----------------------------------------------------------------------------------------------------------------------------

Is it correct or not ?

Thanks for your help

aoliva

Thanks for your replay Alex.
I have already checked both the .xml file and the presentation of A. Tafuni, but I'm quite confused on how to properly apply a fixed value of density at the boundary.

On the .xml file I found this:

-----------------------------------------------------------------------------------------------------------------------------
Rhop definitions ***
Fixed Constant rhop
imposerhop mode="0" comment="Outlet rhop 0:Imposed fixed value, 1:Hydrostatic, 2:Extrapolated from ghost nodes (default=0)"
imposerhop
-----------------------------------------------------------------------------------------------------------------------------

For my understanding this is only the setting to enable fixed rhop at the boundary.
My question is what is the correct "missing" part of the code to impose the density.
I'm trying with some like that:

-----------------------------------------------------------------------------------------------------------------------------
imposerhop mode="0" comment="Outlet rhop 0:Imposed fixed value, 1:Hydrostatic, 2:Extrapolated from ghost nodes (default=0)"
rhop value="1517" comment="Characteristic inlet rhop (default=1000)" units_comment="kg/m^2"
imposerhop
-----------------------------------------------------------------------------------------------------------------------------

Is it correct or not ?

Thanks for your help

TPouzol

Hey,

I've been using Inlet as well and I was wondering in which case setting the density should be done. Even though this is weakly compresible SPH, it seems strange to me.

Thanks