Magnetic diffusion into the outflow object - Marvin

In the last weeks we were facing the problem that the magnetic field diffuses into the outflow object and is amplified there to considerable field strengths.

Here I show two more tests, both animations show the face-on view of the absolute value of the magnetic field strength in Gauss. The inner black circle marks the radius of the outflow object, the outer black circle marks the initial inner rim of the accretion disk.

Animation of the face-on magnetic field strength, outflow with increased ram pressure​

Animation of the face-on magnetic field strength, outflow with inner radius set to zero​

In the first animation I increased the ram pressure of the outflow by a factor of 8, so that the inner rim of the accretion disk does not reach the outflow object anymore. Nevertheless the magnetic field moves into the outflow object and is amplified to field strengths of more than 10 microgauss.

In the second animation I set the inner radius of the outflow object to zero, so there is no longer a central region where the velocity is set to zero. There is still a magnetic field present in the outflow object, but with very low field strengths of about 10-11 Gauss. I don't think that these have an effect on the results, so in future simulations I will just set the inner outflow radius to zero to avoid this problem.

Face-on magnetic field strength, outflow with increased ram pressure:

Face-on magnetic field strength, outflow with inner radius set to zero:

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