Introduction
As explained in my previous post Aircraft Lightning Electromagnetic Pulse Simulation I the CST transient task with combine results workflow is the preferred one for long lasting lightning pulses. Multiple stroke pulse pattern and multiple burst pulse pattern extend in the millisecond and second range, respectively.
Multiple Stroke Pulse Pattern
The multiple stroke pulse pattern in Fig. 1 is composed of randomly spaced current components D and D/2 shown in Fig.2 and last for 1.5 seconds.
The circuit simulation, including vector fitting but excluding the 3D electromagnetic simulation, of the aircraft model, described in my post Aircraft Lightning Electromagnetic Pulse Simulation I, took only about 72 seconds on a laptop computer to reach the cable pin current output in Fig. 3.
Multiple Burst Pulse Pattern
The multiple burst sequence in Fig. 4 is composed of three randomly spaced bursts. Each burst in Fig. 5 consists of 20 randomly spaced current components H in Fig. 6. Multiple burst sequences last for up to 620 ms and each burst for up to 20 ms.
The circuit simulation, including vector fitting but excluding the 3D electromagnetic simulation, of the aircraft model, described in my post Aircraft Lightning Electromagnetic Pulse Simulation I, took only about 17 minutes on a laptop computer to reach the cable pin current output in Fig. 7 and Fig.8, respectively.
From Fig. 8 it's the effect of closely space H pulse becomes visible in terms of increased amplitudes due to superimposed pulses.
Conclusion
Typically a CST transient co-simulation workflow of a single pulse up to 100 microseconds on HPC hardware already takes several hours. With that in mind multiple stroke pulse pattern and multiple burst pulse pattern simulation are even not feasible. If for instance a single pulse simulation up to 100 microseconds would last for about 4 hours a multiple stroke pulse pattern simulation up to 1.5 seconds would last for 60000 hours or 2500 days. A multiple burst pulse pattern simulation would probably last for about 1033 days. Even if the the 3D electromagnetic simulation of the CST transient task with combine results workflow takes hours or even some days it still allows to simulate multiple stroke pulse pattern and multiple burst pulse pattern events in a reasonable time.
