Hello Reno,
I am writting this message to let you know that the issue has been solved. The problem was in the density units. On the flap example in the LS-Dyna examples webpage, the units are not in SI. Considering this and that I am not used to the imperial decimal notation (, .) the error went unoticed on my checks.
Sorry for any inconvenience. I hope you have a great day.
Arnau
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