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November 15, 2013, 08:41 |
Cyclic boundary giving wrong gradient
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#1 |
New Member
Ralf Kuehn
Join Date: Mar 2009
Posts: 4
Rep Power: 17 |
Hi,
I'm trying to simulate a simple test case. A fully developed laminar flow through a channel with simpleFoam using cyclic BC on the inlet and outlet (simple 2D channel, length 0.5 m height 0.05 m, viscosity 100 Pas, rho 1000 kg/m3). I set up the average cyclic velocity ubar (0.05 0 0) into the fvOptions dict and setup 'type cyclic' for the inlet and outlet boundaries. After solving the case i get the expected parabolic velocity profile. Looking into the log for the pressure gradient, I got a number with the correct magnitude (expected -24.0), but the wrong sign (.. "Pressure gradient source: uncorrected Ubar = 0.05, pressure gradient = 23.666" ...) As the channel flow is driven by the pressure gradient, it should be negative ???! Can anybody give me a hint, what's going wrong? Thanks |
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