# RMS Velocity coordinates transform?

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 July 6, 2016, 23:54 RMS Velocity coordinates transform? #1 New Member   Ray Join Date: Oct 2015 Posts: 4 Rep Power: 7 Dear all, I have the RMS fluctuating velocities in Cartesian coordinate taken from a FLUENT LES simulation. But I now need to check the the RMS fluctuating velocities in cylindrical coordinate. Do anybody know how to transform RMS fluctuating velocities from Cartesian to cylindrical? Many thanks Ray

 July 9, 2016, 05:08 #2 New Member   Ray Join Date: Oct 2015 Posts: 4 Rep Power: 7 figure it out. actually quite easy ~_~ . I will put the answer here just for people who may need a quick answer of it. radial: ur_rms=sqrt(cos(theta)*cos(theta)*SQR(ux_rms)+sin( theta)*sin(theta)*SQR(uy_rms)+2*cos(theta)*sin(the ta)*uv) tangential: ut_rms=sqrt(cos(theta)*cos(theta)*SQR(uy_rms)+sin( theta)*sin(theta)*SQR(ux_rms)-2*cos(theta)*sin(theta)*uv)

 Tags coordiante transformation, rms velocity

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