Compressible Pressure Driven Flow

mateiu2003k · August 18, 2014, 15:23

Hello everyone,

I am pretty new and inexperienced with openFOAM (I am currently using version 2.1.1). My goal is to simulate a the flow of a cold gas (Helium at 77K) through a nano-pipe. I have started with the simplest case: incompressible Helium gas at room temperature and macro-pipe (several millimetres in diameter and pretty long). I have used icoFoam solver and retrieved a laminar flow as expected. However, now I need to pass to the next step -> compressible gas simulation. I want to start as simple as possible: room temperature, long pipe (cm or even m) and pressure driven flow (ie: declare inlet pressure, outlet pressure and obtain velocity profile). I have tried sonicFoam with no success. I have started with the forward step test case. It works fine, but as soon as I change any parameter the simulation will crash. For instance if I change the temperature from 1K to 100K in the initial conditions I will get segmentation fault -> CORE dumped error.
If anyone has the slightest hint on how should I proceed and/or what solver should I tackle first for my compressible pressure driven flow simulation, feel free to answer me.

Many thanks!

yeya · August 24, 2016, 06:00

Hi mateiu2003k,
Im doing a similar case and i am trying it with incompressible first as well, and was wondering what did you set as your pressure difference between your inlet and outlet?

August 18, 2014, 15:23	Compressible Pressure Driven Flow	#1
mateiu2003k New Member Matei Petrescu Join Date: Jun 2013 Location: Montreal, Canada Posts: 5 Rep Power: 12	Hello everyone, I am pretty new and inexperienced with openFOAM (I am currently using version 2.1.1). My goal is to simulate a the flow of a cold gas (Helium at 77K) through a nano-pipe. I have started with the simplest case: incompressible Helium gas at room temperature and macro-pipe (several millimetres in diameter and pretty long). I have used icoFoam solver and retrieved a laminar flow as expected. However, now I need to pass to the next step -> compressible gas simulation. I want to start as simple as possible: room temperature, long pipe (cm or even m) and pressure driven flow (ie: declare inlet pressure, outlet pressure and obtain velocity profile). I have tried sonicFoam with no success. I have started with the forward step test case. It works fine, but as soon as I change any parameter the simulation will crash. For instance if I change the temperature from 1K to 100K in the initial conditions I will get segmentation fault -> CORE dumped error. If anyone has the slightest hint on how should I proceed and/or what solver should I tackle first for my compressible pressure driven flow simulation, feel free to answer me. Many thanks!

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August 24, 2016, 06:00		#2
yeya New Member larmes Join Date: Aug 2016 Posts: 26 Rep Power: 9	Hi mateiu2003k, Im doing a similar case and i am trying it with incompressible first as well, and was wondering what did you set as your pressure difference between your inlet and outlet?