[pawlo]

Hi!

I want to simulate a closed room with a combustion device inside that room with OpenFOAM 2.3.
The device is not part of the simulation, i am doing all combustion calculations with swak4foam.
So basically the device in my simulation is just a "cut out" cuboid inside the room.
One patch of this cuboid is the "suck in" side (lets call it outlet), and the opposite patch is the inlet into the simulation domain.
The device sucks in the gas in the room, heats it up and releases it at the other side of the device.

At the outlet i have to prescribe a constant volume flux and at the inlet i prescribe a time dependant volume flux.
The time dependency is given by my swak4foam routine, witch ensures a constant mass in the room for all times.

Since i have to prescribe two volume flux / velocity boundary conditions, i can not prescribe pressure at these boundaries.
So my question is, if it is possible to select a cell in the internalField at witch i can set a reference pressure?

Right now i solved it by prescribing a constant pressure at one of the other patches of the device-cuboid.
The simulation runs very well but the velocity at this pressure-patch is a bit ugly... .
I would prefer to just set one single cell in the domain as pressure reference, preferably somewhere near a wall where the velocity will be almost zero anyway.