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Appropriate model for turbulent, steady state pipe elbow flow |
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March 21, 2009, 09:22 |
Appropriate model for turbulent, steady state pipe elbow flow
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#1 |
New Member
Milos Stanic
Join Date: Mar 2009
Location: Novi Sad, Serbia
Posts: 29
Rep Power: 17 |
Hi everyone!
Ok, here's the deal: I am investigating a case of turbulent, steady state pipe elbow flow or to be more precise, pressure drops due to pipe elbows (DN 50). Now, I believe that the best solver for this kind of thing is simpleFoam, but the thing is that I don't get the appropriate stream (velocity vector) vortices in the elbow. I do get the vortices, but they start appearing after the elbow, not in the elbow as the experience tells us. I attached an example pic named U_vortices.jpg from one science projects I found done in Fluent. Notice that the text beneath the pic says it is elbow-MIDSECTION (45 deg or half-way through the elbow). I actually used very similar parameters of the flow as in that simulation, which includes: Re around 540000, with water as a fluid (nu at 20 deg C = 1.004e-6). Now take a look my other attachment named Stream 1.jpg , which is what I got. Where's the catch? My pressure BC's are: inlet - zeroGradient outlet - fixedValue (0) wall - zeroGradient My velocity BC's are: inlet - fixedValue (10 0 0) outlet - zeroGradient wall - fixedValue (0 0 0) Thanx! Milos |
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March 24, 2009, 17:30 |
Make the images really comparable :-)
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#2 |
New Member
Join Date: Mar 2009
Posts: 5
Rep Power: 17 |
Hello Milos
could you also make a plot similar to U_vortices.jpg? I find it very hard to compare your data with the Fluent simulation... I even suspect that they might be closer than youŽd think at first glance. Regards, George |
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March 25, 2009, 09:08 |
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#3 |
New Member
Milos Stanic
Join Date: Mar 2009
Location: Novi Sad, Serbia
Posts: 29
Rep Power: 17 |
Thnx for the reply George.
After several hours of roaming through ParaView I found the option that provided me with the speed intensity scalars (namely: Ux, Uy, Uz), which in addition gave me the attached photo. I guess I was really close all the time... The thing is just that the guy, who has done the example simulation in Fluent, actually drew, as it states beneath his figure - IN-PLANE velocity VECTORS. I'm not sure whether I can do a similar thing in ParaView... Does anyone know how to do that in ParaView? The closest I got was graphing the speed component intensity as a scalar. |
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July 7, 2009, 11:09 |
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#4 | |
Senior Member
Join Date: Mar 2009
Location: Norway
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Quote:
I'm on a quest for pipe simulation myself - and would like to know what files you keep in your '0' directory for this kind of simulation? The tutorials I have been looking through all seem to use gases - and I wonder if I can simplify the setup using a fluid (water)? The problem is that my simulation using simpleFoam is very very slow, basing it upon a previous gas-case tutorial. |
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July 9, 2009, 02:24 |
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#5 |
New Member
Milos Stanic
Join Date: Mar 2009
Location: Novi Sad, Serbia
Posts: 29
Rep Power: 17 |
I used simpleFoam solver, since it is for incompressible flows... I simply used the files from the tutorial folder.
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