Conjugated heat transfer simulation of a CVT

Within this work the thermal aspects of a continuously variable transmission (CVT) are investigated. Similar studies are hardly available in the current literature. Especially due to increasing engine power the design of a sufficient cooling system for the CVT is very important as the component temperatures are rising as well. Computational Fluid Dynamics (CFD) can be used to analyse the heat transfer effects within an enclosed CVT unit to ensure proper cooling.

However, the first step is to generate a valid numerical model for a complex CVT system which includes motion of the components, heat input and correct heat distribution within the computational domain. All these effects can be taken into account in a quasi-steady-state CFD simulation which is carried out in  STAR-CCM+®. The computation of radial symmetric surface temperature profiles is a delicate task and a novel method has been developed which is capable of calculating realistic temperature profiles. For the evaluation of the numerical results, experiments have been carried out and the comparison shows good agreement between the simulated and the measured values.

In the following presentation the definition of the computational domains, the modelling of the physics, as well as the test rig and the measurement procedure will be discussed in detail. Special focus is laid on the newly developed method to compute accurate surface temperatures for rotating components in a steady state simulation.

The validated model allows engineers to virtually compare numerous cover designs beforehand and only promising design concepts need to be tested on the test bench.     

Session Time Slot(s): 
07/03/2017 - 2:25pm-07/03/2017 - 2:50pm
Room III
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BRP-Rotax GmbH & Co KG
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Graz University of Technology