Gas dispersion in air error message

redhoax · February 27, 2013, 11:03

Hello. This is my first post here (after some time lurking) so please be gentle.

I've recently picked up OF and am a novice to the tool.

My case is dispersion of CH4 in an open environment exposed to wind. The domain is just an open box. So far I've set up a case with an inlet for wind from one of the sides, and a small inlet for gas at the floor. The scenario could be an offshore pipeline rupture from which gas(CH4 in my case) has leaked to the surface of the sea, and my task is to look at the dispersion of CH4 in air.

So far the wind is working well, and I did configure the 'gas inlet' to a standard air inlet, just for starters. And up till now I've been using simpleFoam, taking pieces from motorBike and turbineSiting tutorials. Now here's my problem: I'm not able to implement the gas profile into my case. How to make the 'gas inlet' spew out gas instead of air? Any tutorial recommendations?

I've been through several tutorials(ie. counterFlowFlame2D) but it has become a bit too much for me to handle. As mentioned, I am quite the novice, at best.

Also, I recognize that I should throw simpleFoam, and instead use the likes of perhaps reactingFoam? Any help is greatly appreciated! Any help at all. If you want me to provide any info, I'll be happy to.

Cheers,
Lasse

grk34 · April 28, 2013, 08:53

Thanks Bruno!!

will do it! and i am using Openfoam version 2.2.0.

grk34 · April 28, 2013, 10:25

Hi Brunos,

When i try to modify the reactingFoam model with my mesh i get the following error.

[COLOR="Red"]
Create time

Create mesh for time = 0

Reading g
Creating reaction model

Selecting combustion model PaSR<psiChemistryCombustion>
Selecting chemistry type
{
chemistrySolver ode;
chemistryThermo psi;
}

Selecting thermodynamics package
{
type hePsiThermo;
mixture reactingMixture;
transport sutherland;
thermo janaf;
energy sensibleEnthalpy;
equationOfState perfectGas;
specie specie;
}

Selecting chemistryReader foamChemistryReader
#0 Foam::error:

rintStack(Foam::Ostream&) at ??:?
#1 Foam::sigFpe::sigHandler(int) at ??:?
#2 Uninterpreted:
#3 Foam::fvPatchField<double>:

perator/=(Foam::fvPatchField<double> const&) at ??:?
...
.
.
.
.
.
.
at ??:?
#26 __libc_start_main in "/lib/i386-linux-gnu/libc.so.6"
#27
at ??:?
Floating point exception (core dumped)

Where is the problem??? What should i change?

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
mass flow in is not equal to mass flow out	saii	CFX	12	March 19, 2018 05:21
error message	cuteapathy	CFX	14	March 20, 2012 06:45
Constant velocity of the material	Sas	CFX	15	July 13, 2010 08:56
air bubble is disappear increasing time using vof	xujjun	CFX	9	June 9, 2009 07:59
Gas pressure question	Dan Moskal	Main CFD Forum	0	October 24, 2002 22:02

February 27, 2013, 11:03	Gas dispersion in air error message	#1
redhoax New Member Join Date: Feb 2013 Posts: 17 Rep Power: 13	Hello. This is my first post here (after some time lurking) so please be gentle. I've recently picked up OF and am a novice to the tool. My case is dispersion of CH4 in an open environment exposed to wind. The domain is just an open box. So far I've set up a case with an inlet for wind from one of the sides, and a small inlet for gas at the floor. The scenario could be an offshore pipeline rupture from which gas(CH4 in my case) has leaked to the surface of the sea, and my task is to look at the dispersion of CH4 in air. So far the wind is working well, and I did configure the 'gas inlet' to a standard air inlet, just for starters. And up till now I've been using simpleFoam, taking pieces from motorBike and turbineSiting tutorials. Now here's my problem: I'm not able to implement the gas profile into my case. How to make the 'gas inlet' spew out gas instead of air? Any tutorial recommendations? I've been through several tutorials(ie. counterFlowFlame2D) but it has become a bit too much for me to handle. As mentioned, I am quite the novice, at best. Also, I recognize that I should throw simpleFoam, and instead use the likes of perhaps reactingFoam? Any help is greatly appreciated! Any help at all. If you want me to provide any info, I'll be happy to. Cheers, Lasse

April 28, 2013, 08:53		#2
grk34 New Member Vivek Join Date: Apr 2013 Posts: 9 Rep Power: 13	Thanks Bruno!! will do it! and i am using Openfoam version 2.2.0.

April 28, 2013, 10:25		#3
grk34 New Member Vivek Join Date: Apr 2013 Posts: 9 Rep Power: 13	Hi Brunos, When i try to modify the reactingFoam model with my mesh i get the following error. [COLOR="Red"] Create time Create mesh for time = 0 Reading g Creating reaction model Selecting combustion model PaSR<psiChemistryCombustion> Selecting chemistry type { chemistrySolver ode; chemistryThermo psi; } Selecting thermodynamics package { type hePsiThermo; mixture reactingMixture; transport sutherland; thermo janaf; energy sensibleEnthalpy; equationOfState perfectGas; specie specie; } Selecting chemistryReader foamChemistryReader #0 Foam::error:rintStack(Foam::Ostream&) at ??:? #1 Foam::sigFpe::sigHandler(int) at ??:? #2 Uninterpreted: #3 Foam::fvPatchField<double>:perator/=(Foam::fvPatchField<double> const&) at ??:? ... . . . . . . at ??:? #26 __libc_start_main in "/lib/i386-linux-gnu/libc.so.6" #27 at ??:? Floating point exception (core dumped) Where is the problem??? What should i change?