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-   -   How to find out tangential induced magnetic filed (https://www.cfd-online.com/Forums/main/241911-how-find-out-tangential-induced-magnetic-filed.html)

Far March 27, 2022 00:12
How to find out tangential induced magnetic filed
 
I have solved MHD flows between two rotating cylinders (2d). I get solution in terms of cartesian coordinates such as bx, by etc.



My problem is that how to find out the tangential component of induced magnetic field from bx and by.

LuckyTran March 27, 2022 01:40
Should be r\dot{\theta}=xB_y-yB_x

Far March 27, 2022 04:23
x and y denotes?

FMDenaro March 27, 2022 07:11
Quote:
Originally Posted by Far (Post 824836)
I have solved MHD flows between two rotating cylinders (2d). I get solution in terms of cartesian coordinates such as bx, by etc.



My problem is that how to find out the tangential component of induced magnetic field from bx and by.



That is very very simple, just use the Cartesian-Cilindrical representation

b = i bx + j by = ir br + itheta btheta


The tangential component is



b.itheta=(i bx + j by ).itheta


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