hi i guess you could scale the voltage and field in a post-processing step. for that you could measure the current in your simulation (flux evaluator + current density), and then scale your field so the current reaches the desired value. you can also measure the impedance from the measured current.

@montanaro Hi montanaro Thanks for all your help. I got your point in your above script and it works on python.

I am not familiar with SCANIP or it's image formats, but can't you export your data as an stl or another compatible image format? In the 'Model' tab, if you click on 'Imp/ Export' -> 'Import' you should be able to see the different file formats that can be imported. If Exporting your whole model as some compatible format doesn't work, maybe you can export the different tissues individually? If this doesn't work then maybe you can email the support team to request compatibility?

Really late reply, sorry, hope the reply is still useful ... Please check in 'Setup' what you set up in 'Periods' ... For user defined sources, the simulation time is defined by 1/frequency * periods ... So this might be the issue (which should probably be changed if so)

You're welcome! If you haven't found it already, you may also check this post: https://forum.zmt.swiss/topic/8/how-to-calculate-the-inductance-of-a-simple-coil It has useful information for computing the inductances...

@Sylvain I agree with you suggestion that the sine wave with duty cycle can be equal to the continuous sine wave as long as both of the excitation signals have the same time-averaged power. But, I still very curious about the computation algorithm of the s4l.

@Sylvain Thank you for you reply. I think I have known the explaination. Actually, I want use the EM FDTD and the Thermal Transient modules to simulate the heating problem. Firstly, I used the sine waveform as the excitation signal. The microwave induced heat caused significant temperature increasing. However, when I replaced the continuous sine waveform into the waveform with pulse width modulation (the duty cycle is 10%), it doesn't see temperature increasing any more. I noticed that I didn't select the option of normalization in the source of Thermal Transient. I don't knwo whether I should select the normalization and set the scale factor as 1 W? The normal sine waveform and the modulated sine waveform are shown in below, respectively. [image: 1588768417656-%E6%8D%95%E8%8E%B72.png] [image: 1588768426827-%E6%8D%95%E8%8E%B71.png]

Yes I'm aware of what you're referring to but there is no readily available template available in Sim4Life. With some work it could be easily generated via a Python script (by creating spheres and disks and using boolean operators to intersect or subtract them) or perhaps you can maybe email the S4L support team to ask if they can provide you with a model for you to import?

Hi, Did you try to run one of the tutorial examples (Dipole antenna, for example) with CUDA solver? How big is your simulation project in terms of grid size?

I am having this issue as well, with S4L Light 5.2.1.1375 which is the latest version(as of the time I am posting this). My model is simple cylinder with homogenous liquid modeled within the S4L software platform. Any advice or insight how to remove it would be much appreciated as it means I cannot run the solver as it diverges. Note: This was fixed by removing the nan's from my source term, and surrounding my cylindeer with a rectangular block of air so that the solver was working in a rectangular black not a cylinder.

Hi, As FDTD is a time-domain based method, implementing LF sources with this method is quite challenging. It would need a very (very) long simulation's time, without any assurance of reaching the correct convergence level at the end - furthermore if your simulation has a certain amount of MCells. For input signal with frequency components below the MHz, LF approach is the only solution that would give you quick and accurate results. I would thus advice you to (1) get the current profile along time, and (2) do a fft so as to get the current's magnitude for each of the frequency components. Then, (3) perform several LF simulations for each of the frequency/magnitude obtained during step (2). Best