Calibration parameters and Viscosboundfactor

[athayasyifa]

Hello,

I am currently conducting calibration in DualSPHysics to align the simulation results with experimental data from the literature. However, I have encountered some issues during the calibration process, as shown in the following image, where I am facing several problems:

When I reduced the dp value from 0.02 to 0.01, the resulting forces became smaller compared to the experimental data. So, when I have to use dp = 0.01, I need to increase the h coefficient to 2.1 for the results to approach the experimental values. I have tried adjusting various other parameters, but the results are still far from expected, and they only approach the experimental values when the h coefficient is set to 2.1. Are there any other parameters I can adjust to bring the results closer to the experimental data? According to the guidelines, the recommended h coefficient ranges from 1.2 to 1.5.

The second issue is that during the calibration, the time produced is still very far from the experimental data. My experimental data starts at a time greater than 4 seconds, while my simulation results are under 2.5 seconds. I have tried adjusting the viscosity, but when I increase it, the recorded force values become smaller again and diverge further from the experimental data. I have also adjusted the viscous boundary, but it does not significantly affect the resulting time.

Please advise me in this regard.
Thank you so much for sharing your knowledge.