Re: Magnetic field around a current carrying square bar

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February 28, 2014, 08:53
Re: Magnetic field around a current carrying square bar
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Yash Ganatra
Join Date: Mar 2013
Posts: 67
Rep Power: 4
Hi,
I am working on the aforementioned problem in ANSYS FLUENT. The aim is to validate this case by implementing UDS - 3 equations for magnetic vector potential and 1 for electric scalar potential.
Approach:
I have modelled the conductor as a box and made an enclosure around it.
For the V(electric scalar pot) equation I need to define 2 separate electrical conductivity - one for air and for copper. I have defined both of these as fluids and unchecked the flow equation option.
Problem:
1. I have tried to do it using Define_Diffusivity UDF and Thread_ID, but the problem is that the conducitivity for copper is not being taken into account. It should be taken as 2700 but I am not able to comprehend why it is being taken as 85.
2. While giving the boundary conditions, FLUENT is slitting the conductor up and down walls into coupled walls and I am getting confused on how to give the boundary condition - I need to give 670 V on conductor_up and 0 V on conductor_down. How should I apply the boundary conditions
3. When I model the copper bar as solid, and solve the UDS over all zones, while initializing I am getting Unknown UDS property method error. What does this mean? Also could someone kindly tell what does "coupled wall" mean?
4. Lastly, I would like to ask does zero normal gradient of field imply that the flux is zero?
I am attaching the UDF I have written, boundary conditions to be applied and a the plot of diffusion coeff of V to highlight my problem.

Any help would be really appreciated.
Thank you,
Regards,
Yash Ganatra
Attached Images
 Boundary-Conditions.jpg (35.9 KB, 12 views) Named_Selection.jpg (28.7 KB, 12 views) CopperBar_electrical_conductivity.jpg (62.8 KB, 13 views)
Attached Files
 CopperBar_27..2_trial_2.c (5.4 KB, 22 views)
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 Tags boundary condition, fluent - udf, magnetic field, uds diffusive

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