|
[Sponsors] |
Rotor-stator computation with Ggi interface (turbDyMFoam) |
|
LinkBack | Thread Tools | Search this Thread | Display Modes |
May 25, 2010, 13:58 |
|
#21 | |
Senior Member
|
Hello Aldo,
Quote:
So does your ggi model work without the turbulence model? I have gotten a k-e turbulence model to work with the ggi. Once I know more specifically where your hung up I can help. Im in the process of testing the ggi interface with the turbulence model and so far so good. Ive signed an NDA on the VAWT design, but I would certainly like to correspond on our solving methods; ericnutsch@gmail.com |
||
May 26, 2010, 07:06 |
|
#22 |
Member
Nick Gardiner
Join Date: Apr 2009
Location: Chichester, UK
Posts: 94
Rep Power: 17 |
Hi Aldo
I don't bother to specify a value for any of the /0/ files - just: type ggi; The important part is specifying correct values for k and epsilon (or omega) My understanding is that you set the internalField as: for k: 1.5(magUI)^2 where magU is the magnitude of the velocity I is the turbulence intensity for epsilon: (Cmu^0.75)(k^1.5)/L where Cmu =0.09 (see /constant/RASProperties) k is worked out through previous L is the characteristic length that you'd use for the Reynolds number for omega if you need it later: (Cmu^-0.25)(k^0.5)/L Good luck! Let us know if it works Nick |
|
June 8, 2010, 08:59 |
GGI for HAWT
|
#23 |
Member
Antoine Devesa
Join Date: Mar 2010
Posts: 36
Rep Power: 16 |
Hi all,
i'm simulating the propeller of an HAWT using GGI / turbDyMFoam, and i'm quite surprised that the wake of my blades is almost unexisting (e.g. no wing-tip structures) for a lambda of around 7 (lambda = Vwingtip / Vinf)... Could you please briefly share your experience on GGI for simulating WT? - Which turbulence model are you using? - Which BC on the rotating elements? - Which lambda? - Which level of initial / inlet turbulence? - Are you satisfied of your results? Thank you for your answers!! Antoine |
|
June 8, 2010, 14:24 |
|
#24 |
Senior Member
|
You are a bit ahead of me. I am currently modelling in 2D with a k-epsilon model. I have yet to confirm its performance with wind tunnel testing, but I will keep everyone posted.
You may want to test that the turbulence values are passing the interface at all, or if there is a time delay. This will give you an idea of where the issue lies... For 3D i believe you will want to use a LES turbulence model, but i have not tested any with the ggi. |
|
June 9, 2010, 06:31 |
|
#25 |
Member
Antoine Devesa
Join Date: Mar 2010
Posts: 36
Rep Power: 16 |
Ok, thanks for keeping posting, it's really interesting.
On my side, i want first to success using RAS approach, before i go to LES. Moreover it's actually not yet possible to use GGI in comibnation with LES, is it? Any other experience to share, concerning 3D RAS simulations of WT with GGI and turbDyMFoam? |
|
June 10, 2010, 08:18 |
does turboDyMFoam work in OF-1.6
|
#26 |
New Member
shyam prasad
Join Date: Mar 2009
Posts: 25
Rep Power: 17 |
Hi Foamers,
Does turboDyMFoam work in OF-1.6? |
|
June 10, 2010, 12:58 |
|
#27 |
Member
Nick Gardiner
Join Date: Apr 2009
Location: Chichester, UK
Posts: 94
Rep Power: 17 |
Hi Shyam - I'm afraid not.
|
|
January 12, 2011, 20:58 |
|
#28 | |
Senior Member
Jie
Join Date: Jan 2010
Location: Australia
Posts: 134
Rep Power: 16 |
Quote:
After I renamed it into movingCells and ran the simulation, I found that the stator is rotating as well. Then I compared the 3d case with 2d case for a very simple rotating block case, i found after I convert the fluent mesh to the OpenFOAM conpatable, the cellZones (should only include the cells from rotator only) include all the cells from both stator and rotor, which causes such problem. Have you experienced this before? Will it be due to the meshing problem? I used the icemcfd. I have upload the case at http://www.megaupload.com/?d=2IIU3UVC Really appreciate if you can have a look at it. |
||
January 12, 2011, 21:37 |
|
#29 |
Senior Member
Jie
Join Date: Jan 2010
Location: Australia
Posts: 134
Rep Power: 16 |
I am not sure whether it is the meshing problem or not. Now I can make the stator to be stationary by re-initialise the /constant/polyMesh/cellZones with the followings:
########## FoamFile { version 2.0; format ascii; class regIOobject; location "constant/polyMesh"; object cellZones; } // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * // 0 ( ) //************************************************** ********************// ########## Then, the cellZones will be re-written with the celld from rotor part. Cheers |
|
Tags |
ggi, segmentation fault, turbdymfoam |
Thread Tools | Search this Thread |
Display Modes | |
|
|
Similar Threads | ||||
Thread | Thread Starter | Forum | Replies | Last Post |
Wind turbine simulation | Saturn | CFX | 60 | July 17, 2024 06:45 |
GGI (General Grid Interface) Connections | feixiangniao | CFX | 4 | January 14, 2010 20:51 |
RPM in Wind Turbine | Pankaj | CFX | 9 | November 23, 2009 05:05 |
CFX GGI Interface Error (non-overlapping) | surge519 | CFX | 1 | August 3, 2009 19:54 |
Replace periodic by inlet-outlet pair | lego | CFX | 3 | November 5, 2002 21:09 |