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How to calculate total current with Matlab livelink?
Posted 20.07.2018, 10:24 GMT-4 1 Reply
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I built a cylinder conductor (axial symmetry), bottom surface is grounded, top surface is connected to a voltage source, i want to calculate the total current passing through the conductor in Matlab.
From mphdoc，i found using code like: "[I, unit] = mphint2(model, 'ec.normJ', 'surface', 'selection', 6)" to evaluate the total currrent passing through selected boundary, but it make errors when run script.
Error using mphint2 mphnumerical (0): Java exception occurred: Exception: com.comsol.util.exceptions.FlException: java.lang.IllegalArgumentException: Illegal input vector illegal entity number Messages: java.lang.IllegalArgumentException: Illegal input vector illegal entity number Error in inttest (line 5) I = mphint2(model, 'ec.normJ','surface','selection',6);
I don't know how to fix it, please help me ......
P.S the simulation works well in COMSOL, and the current density is reasonable, but it goes wrong in livelink with matlab when using "I = mphint2(model, 'ec.normJ','surface','selection',6)"
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The problem has already been solved. One day later, i found it should use line integration to calculate current, but there still a problem: the current that calculated by COMSOL (reasonable) is not consistent with which calculated by matlab.
after looking up in mphdoc, i found when using axial symmetry model, the Matlab script should be wrote as "[I,unit] = mphint2(model, 'ec.normJ','line','selection',6, 'intsurface','on');"
i hope this may provide some help for latecomers