The impeller is linked to the housing as well as the housing linked to the engine shaft. It's got curved and angled vanes. It rotates Together with the engine speed and includes automated transmission fluid. When it rotates Using the engine, the centrifugal force would make the fluid go outward. https://rafaelzefec.tribunablog.com/little-known-facts-about-torque-converter-clutch-48602098