Compressible flow

eric weddle · November 9, 2011, 08:58

Hello there.

Well, I'm new with OpenFOAM and for the past month I've been using it to perform some simulations.

To do so, I took icoFoam and added a second phase to the simulation obtaining a velocity field for each phase. Later on I also added temperature transport for both phases.

Until now I've been simulating only incompressible fluids, but now I need to do the same with compressible ones.

Until now the fluids I was using had constant densities, given by a scalar value, but now I want to change this so I can assign them a variable value given by an equation, such as:

"Pressure/(R*Temperature)", being R the gas universal constant.

As you can see the density would then depend on the pressure, characterizing a compressible flow.

What modifications should I perform in my modified icoFoam so it would be able to correctly simulate this situation???

Or would it be better to use another built-in solver?

Thanks a lot

anon_a · November 10, 2011, 04:41

Why don't you try rhoCentralFoam or another compressible solver?
I am not an expert in this field but it sounds like you will need many modifications

vkrastev · November 10, 2011, 08:12

Use rhoPimpleFoam or rhoPisoFoam and run them in laminar mode (if you need a laminar solution)

V.

November 9, 2011, 08:58	Compressible flow	#1
eric weddle New Member Join Date: Sep 2011 Posts: 12 Rep Power: 14	Hello there. Well, I'm new with OpenFOAM and for the past month I've been using it to perform some simulations. To do so, I took icoFoam and added a second phase to the simulation obtaining a velocity field for each phase. Later on I also added temperature transport for both phases. Until now I've been simulating only incompressible fluids, but now I need to do the same with compressible ones. Until now the fluids I was using had constant densities, given by a scalar value, but now I want to change this so I can assign them a variable value given by an equation, such as: "Pressure/(R*Temperature)", being R the gas universal constant. As you can see the density would then depend on the pressure, characterizing a compressible flow. What modifications should I perform in my modified icoFoam so it would be able to correctly simulate this situation??? Or would it be better to use another built-in solver? Thanks a lot

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November 10, 2011, 04:41		#2
anon_a Disabled Join Date: Mar 2011 Posts: 174 Rep Power: 15	Why don't you try rhoCentralFoam or another compressible solver? I am not an expert in this field but it sounds like you will need many modifications

November 10, 2011, 08:12		#3
vkrastev Senior Member Vesselin Krastev Join Date: Jan 2010 Location: University of Tor Vergata, Rome Posts: 368 Rep Power: 20	Use rhoPimpleFoam or rhoPisoFoam and run them in laminar mode (if you need a laminar solution) V.