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-   -   Compute Torque on Rotational Model (http://www.cfd-online.com/Forums/fluent/38779-compute-torque-rotational-model.html)

 rachid November 29, 2005 20:15

Compute Torque on Rotational Model

Hello again,

Is it possible to print the torque applied by the fluid on a rotational model such as an impeller or a wind turbine?

Conventional type of analysis is to input the angular velocity "w" , in this case it is all confusing because the rotation is caused by the fluid flow.

 bharat November 30, 2005 05:42

Re: Compute Torque on Rotational Model

Hi Rachid, Try Report->moments option in fluent. You have specify the zone and the moment center.

hope this helps bharat

 rachid November 30, 2005 12:53

Re: Compute Torque on Rotational Model

Thank you Bharat.

Yet there is one thing still i am not sure. If we are to design the analysis with the angular velocity input, how can we manage to read the moment that is caused by the wind? I mean i am thinking the wind speed is variable and other parameters like w, M, etc. is the output, since the model geometry is constant for each case.

Just in case if i change the wind velocity magnitude to see the effects on the moment around the windmill center.

Thanks again...

 bharat November 30, 2005 20:25

Re: Compute Torque on Rotational Model

Hi Rachid, I assume that u r using MRF model of fluent. In that case the moment u get by report-moment would be the moment felt by the blades for the angular velocity and wind speed u r inputting. Since MRF is a steady state model, i will give u reasonable moment felt by the blades.

hope this helps bharat

 rachid December 1, 2005 11:51

Re: Compute Torque on Rotational Model

Yes MRF is used. Then this is the answer.

One last thing. In this case angular velocity input becomes very important i mean the exact value must be obtained from experiment because any other value should not make sense as even the wind is flowing through the blades we try to hold the shaft to slow down. Is this right?

By the way thanks for your time...

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