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April 27, 2009, 03:30 |
Outflow vs Pressure Outlet BCs
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#1 |
New Member
Vivek
Join Date: Apr 2009
Posts: 7
Rep Power: 17 |
Hi,
Could someone explain to me the difference between outflow and pressure outlet boundary conditions? I simulated a steady state flow through a straight pipe using the two different boundary conditions at the outlet, with a velocity inlet boundary condition at the inlet. I get quite different results in terms of the total pressure drop. Why is this so? Thanks, Vivek |
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April 27, 2009, 04:58 |
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#2 |
New Member
Join Date: Apr 2009
Posts: 4
Rep Power: 17 |
The conditions Fluent uses can be found in the manual
http://www.ipt.ntnu.no/manuals/Fluen...g/main_pre.htm the outflow boundary condition is described in 7.10.1 and 7.10.2 the Pressure Outlet boundary is described in 7.8.1 taking a quick look at it i think the pressure outlet defines -static pressure -backflow condition (and some other things) while in the case of an outflow a zero diffusion flux is defined for all variables |
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