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Torque and Pressure CFD Correlation of a Torque Converter

Published August 22, 2019 by SAE International in United States
Torque and Pressure CFD Correlation of a Torque Converter
Sector:
Citation: De Jesus Rivera, E., Woodland, M., Robinette, D., Blough, J. et al., "Torque and Pressure CFD Correlation of a Torque Converter," SAE Int. J. Passeng. Cars - Mech. Syst. 12(3):2019, https://doi.org/10.4271/06-12-03-0012.
Language: English

Abstract:

A torque converter was instrumented with 29 pressure transducers inside five cavities under study (impeller, turbine, stator, clutch cavity between the pressure plate and the turbine shell). A computer model was created to establish correlation with measured torque and pressure. Torque errors between test and simulation were within 5% and K-Factor and torque ratio errors within 2%. Turbulence intensity on the computer model was used to simulate test conditions representing transmission low and high line pressure settings. When turbulence intensity was set to 5%, pressure simulation root mean square errors were within 11%-15% for the high line pressure setting and up to 34% for low line pressure setting. When turbulence intensity was increased to 50% for the low line pressure settings, a 6% reduced root mean square error in the pressure simulations was seen. For all pressure settings, cavities closer to the converter inlet required a 5% turbulence intensity while the cavities inside or near the torus were better suited with 50% turbulence intensity levels.