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

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

we typically calculate the statistics (first and second order tensors) 
in the Cartesian system (x,y,z), and then use proper rotation matrices 
to go to the cylindrical tensor components. Depending on the flow, one 
can then also do a radial average. In some cases we evaluate the 
statistics on the SEM mesh, or directly on an interpolated polar mesh.

Philipp

On 2018-01-17 20:10, nek5000-users at lists.mcs.anl.gov wrote:
> 
> Dear Jian,
> 
> 
> You can do the conversion when you process the data by taking the dot 
> product of any (x,y,z) vector with the unit-radius vector, which is
> 
> U = (x,y)/r, where r = sqrt( x*x+y*y)
> 
> 
> hth,
> 
> 
> Paul
> 
> 
> ------------------------------------------------------------------------
> *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:* Wednesday, January 17, 2018 11:49:03 AM
> *To:* nek5000-users at lists.mcs.anl.gov
> *Subject:* [Nek5000-users] How to change the x y z coordinates to be polar
> Hi Nek,
> 
> Do you know how to change the result of rms to be based on polar 
> coordinates? Currently I have x, y and z directions for the circular 
> pipe. I have to plot the rms in axial,radial and azimuthal.
> 
> Cheers,
> 
> Jian
> 
> 
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