# Temperature inlet/outlet boundary conditions

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April 13, 2011, 08:44
#21
Member

Wolfram Kretzschmar
Join Date: Dec 2009
Posts: 71
Rep Power: 10
Hi all!

Quote:
 Originally Posted by poplar If you have one outlet and the outlet perpendicular to gravity, simply specify a fixed value zero for pressure. If not,you have to specify the static pressure p in version 1.6, pd(=p-rho*h*x) in 1.5. Setting pd=0 is a easy way, I am not sure whether 1.6 supports pd. In 1.6, it seems that uniformDensityHydrostaticPressure is supposed to facilitate the transition from pd to p by specifying an equivalent to constant pd.
Refering to the above example and running it in OF1.7,wouldn't this mean to set p_rgh to zero? What to set for p then? How to apply the uniformDensityHydrostaticPressure BC correctly? I just can't get it right with this p/p_rgh distinction...

In all setups I tried, setting p_rgh to zero lead to an immediate abort of the solver at timestep 0.

Cheers
Wolle

P.S.: Does anyone have a copy of the complete case discussed above by any chance?
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CAELinux 2010 -- OpenFOAM 1.7

August 8, 2011, 09:15
Temperature problem
#22
New Member

Peter
Join Date: Feb 2011
Posts: 13
Rep Power: 9
I am trying to do a natural convection case. I got some weird low temperature under the cilinder and pressure stripes at my boundaries Somebody can help me out? See attachment for pictures. The cilinder is 400K and the internal field 300K. If somebody want to see some 0 files, tell me.
Attached Images
 Temp.jpg (15.9 KB, 46 views) p_rgh.jpg (24.5 KB, 40 views) P.jpg (24.6 KB, 39 views) Velocity.jpg (16.8 KB, 31 views)

 July 20, 2016, 16:06 Heat transfer in turbulent pipe flow #23 New Member   Ravi Join Date: Jul 2016 Posts: 3 Rep Power: 3 Hi, can anybody tell me what has to be the temperature boundary condition of pipe wall and pipe outlet in a turbulent pipe flow where there is uniform heat flux(37.5 W/m^2) at wall and fluid entering at 300K

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