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November 2, 2012, 01:26 |
How to use non-uniform boundary condition
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#1 |
New Member
j.t.
Join Date: Nov 2012
Posts: 11
Rep Power: 13 |
Hi all,
I need to specify an inlet velocity to the flow inlet (the case is a simple cuboid with flow entering the left and leaving the right side). I considered using the traditional inlet BC openfoam has, but I need to apply cyclic BCs for the inlet and outlet.And if I understand it right, the cyclic BC is applied as inlet { type cyclic; nFaces 256; startFace 11520; matchTolerance 0.0001; neighbourPatch outlet; } outlet { type cyclic; nFaces 256; startFace 11776; matchTolerance 0.0001; neighbourPatch inlet; } There is no way I can specify the initial velocity (which is a constant 10 m/s throughout the inlet surface) to the inlet in the above definitions? So is it that the only option I have is to specify the values of velocity at the inlet is to create a non-uniform field and assign individual velocity values throughout the domain in the form internalField nonuniform <List>; { ..... ..... } This approach is ok, but I have almost 5 million cells in my mesh and I really have no idea as to which cells correspond to the inlet. Please guide me what to do here, since I am very new to openfoam.. Thanks in advance! |
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November 12, 2012, 09:27 |
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#2 |
Member
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Hi,
I do not think you can specify velocity with cyclic boundary condition. The driving force will be the pressure. So what you might want to do is to apply a pressure difference between the 'inlet' and 'outlet' of your domain. Then it will be fine, I think. Duong |
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November 12, 2012, 12:45 |
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#3 |
Senior Member
Daniel P. Combest
Join Date: Mar 2009
Location: St. Louis, USA
Posts: 621
Rep Power: 0 |
Why not try the mapped patch instead of cyclic? This way you could define an inflow velocity. Otherwise, create or use a solver that has a way to drive the flow at a constant flow rate in a particular direction...like channelFoam.
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December 18, 2012, 16:59 |
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#4 |
New Member
j.t.
Join Date: Nov 2012
Posts: 11
Rep Power: 13 |
Thank you all for replies. You are right, i cant apply velocity in periodic bc...and channelFoam looks apprppriate for me.
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