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#1 |
New Member
Icaro Amorim de Carvalho
Join Date: Dec 2020
Posts: 24
Rep Power: 5 ![]() |
Hi all,
I am trying to simulate an incompressible and laminar flow about a system. I am varying the angle of attack of the incoming flow. In order to do so, I have created an O-grid (please see the attached figure. The system is centred at the origin, the flow comes from some angle, and the outer flow domain is a large circumference). However, I have not been getting results that agree physically with the literature and I am quite confident that this has to do with my boundary conditions. So I would like to ask: what is the correct input for my boundary conditions? I have used the following for the 0/U: Code:
FREESTREAM { type freestreamVelocity; freestreamValue $internalField; } Code:
FREESTREAM { type freestreamPressure; freestreamValue $internalField; } Code:
FREESTREAM { type patch; physicalType patch; nFaces 656; startFace 538976; } The contours of vorticity resulting from this setup are given as in the figure from ParaView, which are very weird. Any help would be greatly appreciated. Last edited by PenPencil; June 7, 2022 at 17:37. Reason: clarity |
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#2 |
New Member
Icaro Amorim de Carvalho
Join Date: Dec 2020
Posts: 24
Rep Power: 5 ![]() |
I would highly appreciate if anyone could give me some input.
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#3 |
Senior Member
Join Date: Apr 2020
Location: UK
Posts: 711
Rep Power: 14 ![]() |
I can see why you went for an O-grid, but this is far from ideal, for a bunch of reasons. Plus your domain size is rather small - if you are interested in the wake flow, then the boundaries are way too close.
I would suggest extending the domain, adding a box around your O-mesh, and then applying simpler boundaries on your box faces - fixedValue on the upstream faces; inletOutlet on the downstream faces. You can rotate the box around the O-mesh in a "turntable"mesh fashion to get different angles of attack, if you are feeling really brave. Good luck. |
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