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This publication covers the development process of a thermal model within a complete longitudinal vehicle simulation. Therefore a dynamic/forward simulation within MATLAB Simulink is used. The modeling of the heat transport in the cooling circuit and the lubrication system as well as the heat input by the internal combustion engine is the focus of research. In the first part various possible numerical solution methods for the heat transport model are analyzed and evaluated with regard to the accuracy of the system description and real time capability. The latter is important as functionalities should be able to be subsequently implemented in an engine control unit. In addition, a method for the modeling of the heat input of the internal combustion engine is evaluated. Finally, a validation of the heat transport and heat input model is performed, using a two-cylinder motorcycle.

Recent trends in computer aided engineering (CAE) and optimization (CAO), seem to be introducing more and more simulation techniques based upon the combination of two ore more simulation tools in order to accomplish a common task. One factor that led to this co-simulation trend is the ongoing development of computational resources which enable the working-together of different simulation tools which are of themselves usually complex enough and finishing the designated tasks within acceptable time limits. This paper deals on the one hand with an independent coupling integration approach and on the other hand with some basic assumptions regarding the synchronization in the time domain which form the very basics of each co-simulation process.

The present paper is part of a more comprehensive study concerning the surface flow in the engine compartment and focuses on the fluid flow of a cooling system in a modern vehicle. The complexity of this field needs to further optimization in the integration of 3D CFD (Computational Fluid Dynamics) methods. An important focus lies on the modeling of radiators and fans. A new simulation method needs to be validated. For this purpose a component test bench was built. This paper shows the results oft the simulation on the test bench and the CFD analysis. All the fan and radiator model configurations have been studied by means of a commercial CFD package. The comparison of the results gives a better understanding of the total system performance for a faster and more reliable preliminary design.