# Relative velocity in simpleSRFFoam

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 November 4, 2008, 09:39 Hi, I have a question to simpl #1 New Member   Miku Join Date: Mar 2009 Posts: 7 Rep Power: 9 Hi, I have a question to simpleSRFFoam. I cannot find a definition of Urel. Relative to what is Urel? And why does simpleSRFFoam use Urel instead of U absolute? Thanks in advance!

 November 4, 2008, 10:21 Hi Miku, Urel is the relati #2 paul_mathis Guest   Posts: n/a Hi Miku, Urel is the relative velocity in the rotational frame, the absolute velocity would then be: Uabs = Urel + omega x R where omega is the angular velocity vector and R the position vectro in rotational frame.

 November 4, 2008, 10:35 Hi Miku, Maybe you will find #3 Senior Member     Dragos Join Date: Mar 2009 Posts: 648 Rep Power: 12 Hi Miku, Maybe you will find this answer satisfactory: relative velocity formulation Dragos

 November 4, 2008, 11:26 Thanks for your answers! If I #4 New Member   Miku Join Date: Mar 2009 Posts: 7 Rep Power: 9 Thanks for your answers! If I have not defined a rotational frame and my rotational axis is equivalent to the z-axis of my stationary coordinate system, I am right that my relative velocity is equivalent to my absolute velocity? miku

 November 4, 2008, 11:51 Hi Miku, The relative velocit #5 Senior Member     Dragos Join Date: Mar 2009 Posts: 648 Rep Power: 12 Hi Miku, The relative velocity is identical to the absolute one, when there is no transport velocity (in your case 0 rotation or 0 rpm). Dragos

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