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Plotting differential quantities in 1D plots
Posted 19 sept. 2016, 11:56 UTC−4 Low-Frequency Electromagnetics, Results & Visualization Version 5.2a 1 Reply
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Hi,
I'm trying to plot the differential of a magnetic field in the z direction with respect to z on a model of a magnetic field around a current loop (I'm very new to comsol). When I plot just the field in the z direction against z the plot makes sense and it is apparent that there would be a field gradient (this also makes sense physically). However, I keep only getting a flat line of 0 for whatever differential I plot. what I've been trying to plot is d(mf.Bz, z) against z and this gives me a straight line at 0. Any help would be appreciated.
Thanks
I'm trying to plot the differential of a magnetic field in the z direction with respect to z on a model of a magnetic field around a current loop (I'm very new to comsol). When I plot just the field in the z direction against z the plot makes sense and it is apparent that there would be a field gradient (this also makes sense physically). However, I keep only getting a flat line of 0 for whatever differential I plot. what I've been trying to plot is d(mf.Bz, z) against z and this gives me a straight line at 0. Any help would be appreciated.
Thanks
1 Reply Last Post 20 sept. 2016, 08:04 UTC−4
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Posted:
8 years ago
Christopher,
Magnetic Field (mf) interface uses curl elements, meaning that you can not obtain derivatives of the magnetic field with these elements. To get derivatives, you need to add another Coefficient From PDE (c) interface with Lagrangian shape functions and perform mapping, as explained in the following Comsol blog:
www.comsol.com/blogs/plotting-spatial-derivatives-magnetic-field
Regards,
Sergei
Magnetic Field (mf) interface uses curl elements, meaning that you can not obtain derivatives of the magnetic field with these elements. To get derivatives, you need to add another Coefficient From PDE (c) interface with Lagrangian shape functions and perform mapping, as explained in the following Comsol blog:
www.comsol.com/blogs/plotting-spatial-derivatives-magnetic-field
Regards,
Sergei