[nobody_is_my_name]

Dear all,

I am simulating a natural convection problem, axisymmetrical geometry.

I would like to simulating the external boundaries (forming a rectangle, whose bottom edge is the axis) as environment (1 atm).

In particular, let be
...........b
..________________
..|......................... |
a|......................... | c
..|..........................|
-- - -- - -- - -- - -- - -- - --
...........d
.
.
I used dots "." as space (they don't represent anything
the domain, where gravity goes from left to right, "d" is the axis
I used:
for "b" and "c" pressure outlet 1atm 25°C
for "a" I want to impose 1 atm but not 25°C: I would like to get zero heat flux.

I see that in "pressure outlet" BC seems not to be possible; I tried to put a far wall, but it is not exactly what I want: a wall implies not flow going up as well.

Could you help me, please?