# Premixed gas explosion in a rectangular chamber

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 February 27, 2019, 10:23 Premixed gas explosion in a rectangular chamber #1 New Member   Abel Tenu Join Date: Feb 2016 Location: Norway Posts: 4 Rep Power: 10 Hello guys, I need some help. I want to model a premixed gas (hydrogen-air and methane-air) explosion in a rectangular chamber with obstacles at different positions using OpenFOAM for my master thesis. Can someone recommend me which solver (other than XiFoam) I have to use? One the other thing is that one end of the chamber is closed with PVC membrane which will break at low pressure (i.e it will be open), allowing the high-pressure gases (both unburned and burned) to escape. Which boundary condition I have to use? Thank you

 March 5, 2019, 00:59 #2 Member   Join Date: Feb 2014 Posts: 62 Rep Power: 12 Why don't you use xiFoam? The outlet boundary is tricky to model exactly. Which field boundary you are concerned with, pressure or velocity? There is wavetransmissive boundary condition. https://openfoamwiki.net/index.php/H...dary_condition

 March 6, 2019, 08:55 #3 New Member   Abel Tenu Join Date: Feb 2016 Location: Norway Posts: 4 Rep Power: 10 Hi Uyan, Thank you for your replay. I just want to try if there is another solver than XiFoam, but now I decided to use it. I am mainly focused on the overpressure and flame propagation speed. I am using wavetransmissive boundary condition for the pressure field. I think that it only allows the pressure wave propagating through the boundary, but I also want the flame to propagate through the boundary and escape from the chamber. Is there a boundary condition to do that? One of my cases is a hydrogen-air explosion, how can I get the Gulder Coefficients for Hydrogen? Tobi likes this.

March 9, 2019, 13:17
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Join Date: Feb 2014
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Quote:
 Originally Posted by abelm Hi Uyan, Thank you for your replay. I just want to try if there is another solver than XiFoam, but now I decided to use it. I am mainly focused on the overpressure and flame propagation speed. I am using wavetransmissive boundary condition for the pressure field. I think that it only allows the pressure wave propagating through the boundary, but I also want the flame to propagate through the boundary and escape from the chamber. Is there a boundary condition to do that? One of my cases is a hydrogen-air explosion, how can I get the Gulder Coefficients for Hydrogen?
Did you try the fireFoam solver?

In the tutorial case there is a case for hydrogen air mixture, which uses a different flame speed correlation.

 March 16, 2019, 13:40 #5 New Member   Abel Tenu Join Date: Feb 2016 Location: Norway Posts: 4 Rep Power: 10 Hi Uyan, Is it possible to use reactingFoam for premixed combustion? Thank you

 March 26, 2019, 03:25 #6 Super Moderator     Tobias Holzmann Join Date: Oct 2010 Location: Tussenhausen Posts: 2,708 Blog Entries: 6 Rep Power: 51 Hi all, I am also interested in such simulations. So if you get any further news, please share it with the community. Do you know any literature about the Xi model approach? I am only familiar with the flamelet model. Thanks in advance. __________________ Keep foaming, Tobias Holzmann