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February 11, 2009, 08:53 |
Hi foamers
i would like to
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#1 |
Member
antonio segalini
Join Date: Mar 2009
Posts: 75
Rep Power: 17 |
Hi foamers
i would like to measure the torque in a certain patch which belongs to a rotating region. I simulate a turbulent flow (with a standard kepsilon model) around some rotating airfoils with a sliding interface method. How can i measure the torque? thanks is advance |
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February 12, 2009, 10:58 |
I have seen a thread that gave
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#2 |
Member
Maruthamuthu Venkatraman
Join Date: Mar 2009
Location: Norway
Posts: 80
Rep Power: 17 |
I have seen a thread that gave a small routine you can add it on Control file. It write both Force and moments , you should specify the moment centre.
Today i am outof office, If u feel difficult in searching the thread then i will post it on monday. |
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February 23, 2009, 04:19 |
Hi foamers
i would like to
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#4 |
Member
antonio segalini
Join Date: Mar 2009
Posts: 75
Rep Power: 17 |
Hi foamers
i would like to measure the torque in a certain patch which belongs to a rotating region. I simulate a turbulent flow (with a standard kepsilon model) around some rotating airfoils with a sliding interface method. How can i measure the torque? thanks is advance |
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February 23, 2009, 04:33 |
Hello Antonio,
HAve a look
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#5 |
Member
Maruthamuthu Venkatraman
Join Date: Mar 2009
Location: Norway
Posts: 80
Rep Power: 17 |
Hello Antonio,
HAve a look at it. Write them at the end of control file . Your forces and moments will be written in seperate folder. Remember to specify the axis of rotation of your rotor. Hope this is what your are asking for ... Alsom set the patch name as you specified in the boundary files... for eg: Wall. Good luck functions // this one! ( forces { type forces; functionObjectLibs ("libforces.so"); //Lib to load patches (building); // change to your patch name rhoInf 1.225; //Reference density for fluid CofR (0 0 0); //Origin for moment calculations } forceCoeffs { type forceCoeffs; functionObjectLibs ("libforces.so"); patches (building); //change to your patch name rhoInf 1.225; CofR (0 0 0); liftDir (0 1 0); dragDir (1 0 0); pitchAxis (0 0 0); magUInf 11.2; lRef 45; Aref 45; } ); |
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February 23, 2009, 04:36 |
thx
i was unsure if this co
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#6 |
Member
antonio segalini
Join Date: Mar 2009
Posts: 75
Rep Power: 17 |
thx
i was unsure if this code will work on rotating patches. I'll tell you soon... :-) |
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February 23, 2009, 05:13 |
actually there is something st
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#7 |
Member
antonio segalini
Join Date: Mar 2009
Posts: 75
Rep Power: 17 |
actually there is something strange since the torque is lower than expected and, also, this is a 2d geometry so the only non zero torque component should be Mz but in this case all the three torque components are comparable.
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February 23, 2009, 05:25 |
Just to make sure check the co
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#8 |
Member
Maruthamuthu Venkatraman
Join Date: Mar 2009
Location: Norway
Posts: 80
Rep Power: 17 |
Just to make sure check the coordinates for the rotation axis. I used the above code for simple fixed cylinders and gave me reliable coeffcients. I hope it will work in the dev version also.
you can plot the coeffcients cd and cl over time and check for periodicity. Check your contours aswell. If all are correct then the above code need some more functional input for torque... This is just a suggestion. |
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February 23, 2009, 05:58 |
looking at the forces, the cen
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#9 |
Member
antonio segalini
Join Date: Mar 2009
Posts: 75
Rep Power: 17 |
looking at the forces, the centre of rotation is correct (0 0 0) and i can obtain the same result with the forceCoeffs. but the problem remains... :-(
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