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#1 |
New Member
Miku
Join Date: Mar 2009
Posts: 7
Rep Power: 18 ![]() |
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! |
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#2 |
Guest
Posts: n/a
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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. |
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#3 |
Senior Member
Dragos
Join Date: Mar 2009
Posts: 648
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#4 |
New Member
Miku
Join Date: Mar 2009
Posts: 7
Rep Power: 18 ![]() |
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 |
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#5 |
Senior Member
Dragos
Join Date: Mar 2009
Posts: 648
Rep Power: 21 ![]() |
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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