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December 14, 2017, 14:16 |
Flow in a 3D Pipe problem
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#1 |
New Member
Join Date: Dec 2017
Posts: 5
Rep Power: 9 |
Hello guys, I'm new to OpenFOAM and to the Forums, so hey !
I'm trying to run a 3D flow in a cylinder. This is a simple case I think. I made the geometry using FreeCAD. It's just a cylinder. (Radius 10 mm / Length: 200 mm) I've used gmsh to discretize it. I added volume and a few surfaces (Inlet, Outlet and Outter_Surface). I've used the files from cavity folder in icoFoam directory. I've tried a lot of things, but the problem is the same: on Paraview the flow appears to be static. I downloaded a mesh (3D pipe) from a video on Youtube and it worked with this cavity case, then I swapped back to my own mesh and the problem was there. ANY information for the newbie will be appreciated =) My full case is here: https://mega.nz/#!c6gVhaga!ithwouOsD...EhVrYXMZEY6teo P.S: English is not my native language. |
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December 26, 2017, 12:08 |
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#2 |
New Member
Join Date: Sep 2017
Location: Santiago, Chile
Posts: 6
Rep Power: 9 |
Well, I have no experience with OpenFOAM but your question is about the geometry basically, so I'll try to help you a little.
If no flow is present check these: - Is the geometry only a volume? Maybe you added surface volumes around the cylinder volume (inlet, outlet, mantle) and the input flow 'stays' at the surface volume inlet. - Check if by changing the condition (velocity, mass flow, volume flow, etc) you get the same result, accordingly. - Does the software you used for meshing allow to check the mesh? As in quality, connections, etc. Maybe doing this will give a hint. |
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December 26, 2017, 15:52 |
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#3 |
Senior Member
Join Date: Dec 2017
Posts: 153
Rep Power: 9 |
Hello,
I think that the problem is that you are assigning an inlet velocity of (10 0 0) but your stearmwise direction in the geometry is "z" and so you should assing (0 0 10). Then adjust the numerical schemes since you are using a tetra mesh which is non-orthogonal and those used in the cavity tutorial are not the best options in this case. AliE |
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January 4, 2018, 14:31 |
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#4 | |
New Member
Join Date: Dec 2017
Posts: 5
Rep Power: 9 |
Quote:
Well not sure if I get what you meant but on Gmsh I added one single volume and then 3 surfaces (faces). I dont think I added volumes around a volume. I checked the mesh using openfoam's command 'checkMesh' and it was ok. |
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January 4, 2018, 14:42 |
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#5 | |
New Member
Join Date: Dec 2017
Posts: 5
Rep Power: 9 |
Quote:
I did some changes onto the numerical scheme. I have " nNonOrthogonalCorrectors 1" and some " cellLimited Gauss linear 1;" on fvSchemes. And other stuff like that. I think I did some boundary changes in polyMesh as well. Now in paraView I have values on the inlet AND outlet, but the cylinder body still remains static. I'll upload my full case again. And thank you, again. https://mega.nz/#!Q2QxXI5A!LnMyDc4DT...flmJLp2qA6IXYM |
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Tags |
3d case, cylinder flow, mesh 3d |
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