The turbine is driven because of the stream of oil sent to it with the pump. The oil enters the blade section near the rim and passes throughout the blades. Your complete assembly is contained and linked to the engine flywheel. The torque converter functions like a hydraulic coupling system. https://torque-converter-clutch53074.dreamyblogs.com/34337522/an-unbiased-view-of-torque-converter-clutch