Multi-phase simulation of a vehicle driving through a water- passage [Elektronski vir]
Greif, David ...
In recent years the importance of computer simulations has been steadily increasing in many areas of vehicle development. Numerical modeling of multi-phase processes such as cavitating injector ...flows, flows in fuel tank systems, vehicles passing through dispersed rain-water or through a water-passage has gained on importance. The efficiency of such simulations is important for the integration of computational fluid dynamics (CFD) methods into product development processes. Commercial CFD code AVL FIRE can be used for simulating complex multi-phase flows in terms of full 3-D Euler-Euler description, which seems to be the suitable approach for majority of the above applications. However, vehicle driving through the water has to be simulated by means of surface tracking techniques such as Volume of Fluid (VOF). Such a method was used in the presented work to solve the splashing problem. In such applications the main objective is to predict the covering of different underhood parts by the water. At certain geometrical locations water is not allowed at all, whereas when in contact with particular parts it can cause thermal shocks. Locations where water has to be avoided are for instance brake discs, engine-air intake or air entering the HVAC system. In the present study realistic vehicle geometry was applied (BMW E60), using a structured computational grid in combination with rotating and non-rotating wheels. VOF and standard 2-fluid models of AVL FIRE were used to test the suitability of the method. Advanced k-ć-f turbulence model adopted for multi-phase flow has been utilized. The effect of rotating vs. non-rotating wheels was studied. For demonstration of the method the vehicle was discretized without detailed under-hood resolution.
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