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<p style="margin-top:0;margin-bottom:0">Dear Jian,</p>
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<p style="margin-top:0;margin-bottom:0">Normally I would write down the quantity of interest, e.g., <ur',ur'>, then expand <ur>, etc., in terms of (ux,uy,uz). When you do the small bit of vector manipulations it will be clear what you need to compute.
Note that [ux,uy,uz]=R*[ur,ut,uz] (ut=utheta),and [ur,ut,uz]=R'[ux,uy,uz], with R*R'=I. </p>
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<p style="margin-top:0;margin-bottom:0">hth</p>
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<p style="margin-top:0;margin-bottom:0">Paul</p>
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<div id="divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" style="font-size:11pt" color="#000000"><b>From:</b> Nek5000-users <nek5000-users-bounces@lists.mcs.anl.gov> on behalf of nek5000-users@lists.mcs.anl.gov <nek5000-users@lists.mcs.anl.gov><br>
<b>Sent:</b> Thursday, January 18, 2018 12:40:34 PM<br>
<b>To:</b> nek5000-users@lists.mcs.anl.gov<br>
<b>Subject:</b> Re: [Nek5000-users] How to change the x y z coordinates to be polar</font>
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<div dir="ltr">Hi Philipp,
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<div>Thanks for your reply. Currently I have the mean statistics. Can I change the averaged velocities and velocities square to be based on polar coordinates, then have the rms in <span style="font-size:12.8px">radial and azimuthal</span>? Or I need to change
the coordinate firstly before the averaging.</div>
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<div>Kind regards,</div>
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<div>Jian</div>
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