[regentropfen]

Hi!

We are working on the wind turbine tutorial from CFDsupport (https://www.cfdsupport.com/download-...d-turbine.html).
In order to analyse the power of the wind turbine, we want to analyse the moment around the rotation axis of the turbine which is (0.993572 0 0.113203). However, forces doesn't seem to work in an appropriate way - it gives us components around x, y and z in the moment.dat instead of the moment around the desired axis.
As we did not find documentation about the coordinateRotation with type axisRotation that is used here, we are a little bit lost... We found something with pitchAxis but do not know how to use it appropriately.
I am sorry if this is a stupid question, we are new to openfoam...
Any help would be appreciated!

turbine-forces-and-moments
{
type forces;
functionObjectLibs ("libforces.so");
writeControl timeStep;
writeInterval 1;
log true;
patches (
blade1-pressureSide1
blade1-pressureSide2
blade1-suctionSide1
blade1-suctionSide2
blade1-cap
blade2-pressureSide1
blade2-pressureSide2
blade2-suctionSide1
blade2-suctionSide2
blade2-cap
blade3-pressureSide1
blade3-pressureSide2
blade3-suctionSide1
blade3-suctionSide2
blade3-cap
);
pName p;
UName U;
rho rhoInf;
rhoInf 1.2;
origin (1.510229221 0 1.672068885);
coordinateRotation
{
type axesRotation;
e1 (0.993572 0 0.113203);
e2 (0 1 0);
}
}

[tomf]

Hi,

I think it should be possible, but it depends on what version you are using. Check source documentation (online):

version 1712, look at the local forces/moments.

version 5, seems similar but also look at the local forces/moments.

Hope this helps,
Tom

[regentropfen]

Yes, it helped, I think we have the right moment now. Thanks a lot!

[aleolsi]

How did you get the right results? Can you post the function with the right axis definition?