@dbsim4

Answering my own question:

In the Modelling tab (not simulation), each imported label/voxel type can be assigned a material in the Controller window.

Auto Assign seems to work decently well if the materials in the file are well named.

Probably should be done before dragging the model into the Simulation.

@montanaro Thank you! The acoustic reflection simulation is now behaving and giving results which map to what you'd expect.

Thank you so much for helping! Jean

Dear Shreya,
I assume you meant simulated 1g and 10g SAR values. If you are referring to dipole antenna tutorial, it is not possible to extract SAR values since the simulation project does not contain any lossy object - it is just a dipole antenna in free-space. Please check "SAR in a Flat Phantom" tutorial and section 3.1.4 of Sim4Life tutorial document for details related to SAR simulation and extractions.

Dear AntoninoMC,

Thank you for your comprehensive solution!!!
Following your advice, I assigned distinct priorities to each tissue, and there is no more need for boolean operations (subtraction). This approach proved to be completely successful.

Hi @tcs,
EM LF Electro QS simulations are electric simulations executed in the LF approximation, where the electric and the magnetic fields are decoupled. Therefore, the electric simulations do not produce any magnetic-related quantity (H and A-field).

In order to simulate problems involving magnetic fields, one of the EM LF Magneto solvers need instead to be used).

If your problem involves radiofrequency EM fields instead (e.g. above 1MHz), the EM LF solvers may be inadequate and you should use the FDTD solvers.

All the best!

Hi Micol,

Did you model the waveguide filling (where you placed the waveguide source) and set the material parameters of this object correctly in the simulation settings?

Hi, please send the file to s4l-support@zmt.swiss address. Thanks.

Something must be wrong in your simulation setup. It is unlikely to be due to the fact that it is a multiport simulation (since under the hood a multiport simulation is just a bunch of "single" FDTD simulations). I would suggest you check the voxels of your simulation (View Voxels) and ensure that they accurately represent what you are trying to simulate. Pay special attention to the sources and the connectivity between the sources and the various PEC elements.

Hi Anna, I see that nobody answered to your question. Were you able to run this type of simulation? I would like to to a phototermal therapy as well using metallic nanoparticles with a laser. I am not sure if with sim4life this type of simulation can be done or not. If you could tell your experience on this, it would be great.
Thanks in advance for your time and help,
All the best,
@AnnaGol

Hi Michael,

Yes, this sounds reasonable. You define the frequency in the Setup settings of the simulation, and you define three boundary conditions, -1, +1, and 0V.

Best,
Habib

Hi Marcus,

This doesn't appear to be related to Windows Defender.

However, from the log you pasted, it is not exactly the tutorial of TMS. The grid is different than what is described in the tutorial, and there is an additional object in the simulation "Reference_Plane".

Something in your setup is not correct anymore and cause the solver to fail. With the amount of information I have here, I cannot suggest a solution.

Please try to run the tutorial as it is (maybe open the project file and run it, instead of building it from scratch), and see if this one fails too.

Best,
Habib

Hi @VigneshYork

Please carefully check that the voxels of the edge sources are correctly generated. You can use the "Connectivity" mode under in Voxel Viewer to check that the edge sources are correctly connected. If that is not the case, you need to work on the grid to fix the issue.

Hi @wouterverhelst

This error can appear with simulations having a non-optimal grid with at least one very small cell leading to a very small step size. Could you please inspect the grid in your simulation and see if it can be improved? Please use "Connectivity" option in voxel view to make sure that the source is connected. If possible, please share more info, for example, parts of the log file where you can see min grid step, time step and initialization of source(s):

[INFO]: Number of cells: … [INFO]: Number of cells including PML: … [INFO]: X: Range [.. ... .. ] with minimal .. and maximal step .. [m] [INFO]: Y: Range [.. ... .. ] with minimal .. and maximal step .. [m] [INFO]: Y: Range [.. ... .. ] with minimal .. and maximal step .. [m] … [INFO]: Simulation Time Step: … sec … [INFO]: Sources: [INFO]: Initializing edge source Lines 1 (Sources) … …