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fluid "methane" through pipeline

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Old   June 9, 2014, 07:53
Exclamation fluid "methane" through pipeline
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makram
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Hello everybody, i'm new in ansys
I have to simulate a fluid "methane" going on through a pipeline which is composed of different parts.
should i use Boolean to collect all parts together in one body?
and should i fill the interior of the pipe to get simple structure and get fluid flow domain?

I hope you would help me
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Old   June 10, 2014, 08:39
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no reply? any one can help me?
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Old   June 11, 2014, 04:15
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Ahmet
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Can you explain more? I could not understand your geometry and physics.
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Old   June 12, 2014, 08:22
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makram
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Hi a_cucen, thanks for you response

Geometry

This is the geometry of the pipeline (which is in reality formed by steel), i do it in CAD and then import it to ansys.



and here when i use Fill operation to get a simple fluid domain.



As you can see the pipe contain many radius sizes



Is these variable radius sizes will effect the results in the simulation?
PHYSICS
After doing a sweep and patch confirming meshing, i setup the following conditions.
Materials
I choose methane as fluid with parameters
density (kg/m3) = 0.6679
cp( j/kg k) = 2222
thermal conductivity (w/mk) = 0.0332
viscosité (kg/m.s) = 1.087e-05

Models
Energy equation: on
viscous laminar ( i don't choose k epsilon shalli use it?)

Cell zone conditions "fluid" méthane for the solid formed by the fill in the geometry step and the other parts "solid" as you can see in the picture



Boundary conditions

inlet-->type-->velocity inlet-->velocity magnitude (m/s)=5
temperature (K)= 298

outlet pressure --> Gauge pressure (pa)= 500000
temperature (K)= 273.15 ( i put it haphazardly because i don't know how much will be the temperature in the outlet, shouldn't ansys calculate it?)

solution initialisation (see picture)



then i do run calculation with 100 iterations (how much can i expand the iterations 200...300...??)
is what i have don right?
is there errors? or something i forget to do?

if you have more questions please tell me

Last edited by makram; June 13, 2014 at 14:15.
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Old   June 13, 2014, 14:20
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can you see the pictures that i have put it ?
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Old   June 16, 2014, 09:59
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It's better if you select all the the separate pipes in design modeller ( I assume you are using design modeller) and combine them as a new part (select all fluid volumes, rt. click and form "new part") then you will only have one fluid volume. As far as the Turbulence modelling goes you should probably turn on the k-eps model atleast as the flow through the pipe is not going to be laminar (especially with all the bends involved.) Also, if you are not concerned with heat transfer in your problem, I suggest you turn off the "energy equation".

Hope this helps.
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