De or het hydrodynamica?

The correct Dutch article is:

de hydrodynamica

Rule Words ending in -ica: usually de. See the rule
Meaning (Dutch) (natuurkunde) leer van de beweging van de vloeistoffen

How to use hydrodynamica

the hydrodynamicade hydrodynamica
this hydrodynamicadeze hydrodynamica
that hydrodynamicadie hydrodynamica
our hydrodynamicaonze hydrodynamica
your hydrodynamicajouw hydrodynamica
every hydrodynamicaelke hydrodynamica
which hydrodynamica?welke hydrodynamica?
a big hydrodynamica / the big hydrodynamicaeen grote hydrodynamica, de grote hydrodynamica

Meaning, plural, diminutive, pronunciation and translations: WikiWoordenboek (Dutch Wiktionary) (CC BY-SA 4.0). Example sentences: Tatoeba (CC BY 2.0 FR).