# How can I convert Uabs to Urel?

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May 16, 2013, 04:26
How can I convert Uabs to Urel?
#1
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Dongyue Li
Join Date: Jun 2012
Location: Torino, Italy
Posts: 742
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Hi all,

I want to convert U absolute to U relative in cylindrical coordinate system.

For example.My cell locate in (1 2 3).and the velocity vector is (2 3 4).
So in cylindrical coordinate system this cell locate in(a b c).
a=square(1^2+2^2)=2.236
b=arctan(2/1)=63.4
c=3
So I can get the cell's location is (2.236 63.4 3)

But can I get velocity in cylindrical coordinate system?

Ua=square(2^2+3^2)=3.605
Ub=arctan(3/2)=56.3
Uc=3?

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Last edited by sharonyue; May 16, 2013 at 05:08.

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