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Hello all,

I am using COMSOL Multiphysics 6.1 with MATLAB. I am attempting to simulate a multiturn split differential coil above a conducting plate. It is supposed to calculate the eddy currents and magnetic fields produced when an aluminum conductor is placed under a multi-turn coil carrying a sinusoidal current. I exported the COMSOL file to MATLAB and attempted to write some code that would simulate a line scan that iteratively moves a notch laterially. When running the code, it produces the following error:

———

Java exception occurred:

Exception:

com.comsol.util.exceptions.FlException: The following feature has encountered a problem

Messages:

The following feature has encountered a problem:

• Feature: Stationary Solver 5.1 (sol1/s5)

  Failed to find a solution.

  In Coil Left (Notch):

  Divergence of the linear iterations.

  Returned solution is not converged.

  Not all parameter steps returned.

Stack trace:

at com.comsol.solver.SolverOperation.execute(SourceFile:360)

at com.comsol.solver.SolverOperation.addError(SourceFile:558)

at com.comsol.solver.SolverOperation.execute(SourceFile:372)

at com.comsol.model.method.SolverSequenceMethod.doRun(SourceFile:2317)

at com.comsol.model.method.SolverSequenceMethod.doRunAll(SourceFile:3046)

at com.comsol.model.dbmodel.SolverSequenceDb.runAll(SourceFile:305)

at jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)

at jdk.internal.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)

at jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)

at java.lang.reflect.Method.invoke(Unknown Source)

at com.comsol.bridge.command.c.a(SourceFile:161)

at com.comsol.bridge.command.c.run(SourceFile:103)

at com.comsol.bridge.command.l.c(SourceFile:213)

at com.comsol.bridge.command.l.a(SourceFile:203)

at com.comsol.bridge.command.l$1.run(SourceFile:94)

at com.comsol.util.thread.SuspendableTasks$1.run(SourceFile:111)

at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)

at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)

at java.lang.Thread.run(Unknown Source)

———

I am fairly new to useing COMSOL so this may not be a particularly interesting question to answer but if you've run into this or something simular, any help is appreciated. I am not sure why COMSOL would be able to solve the model but the MATLAB code produced by COMSOL would not be able to.

Please let me know if any additional information is required.

Thank you!