[Nek5000-users] How to change the x y z coordinates to be polar

[nek5000-users at lists.mcs.anl.gov]

Dear Jian,


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.


hth


Paul


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From: Nek5000-users <nek5000-users-bounces at lists.mcs.anl.gov> on behalf of nek5000-users at lists.mcs.anl.gov <nek5000-users at lists.mcs.anl.gov>
Sent: Thursday, January 18, 2018 12:40:34 PM
To: nek5000-users at lists.mcs.anl.gov
Subject: Re: [Nek5000-users] How to change the x y z coordinates to be polar

Hi Philipp,

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 radial and azimuthal?  Or I need to change the coordinate firstly before the averaging.

Kind regards,

Jian
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