This article presents the novel experiment of the modified SAE model with a heated plug and discusses the details about the new developments of the numerical model of the PowerFLOW4.0 version, which employs a Lattice Boltzmann model and incorporates an improved unsteady two equations RNG kappa-epsilon turbulence model, a coupled PDE for the energy equation and an advanced wall model for both flow and thermal boundary layers. The hot flow is discussed both experimentally and numerically. Distributions of the flow field are compared with available experimental findings. The predictive capability and the feasibility of the current Lattice Boltzmann approach is demonstrated and the applicability to similar flows over realistic road vehicles is discussed. The overall flow structures are accurately captured by the PowerFLOW simulation both qualitatively and quantitatively. The current numerical approach shows good results inside the cooling air evacuation duct for the surface cp values on the upper wall. Also the results for the velocity field in the xz-wake, yz-wake and xy-underbody planes are simulated accurately. The temperature field for the two planes in the wake is calculated quantitatively very accurately. However, the expansion of the temperature wake flow field in vertical direction is smaller in simulation, which is expected to improve further by longer simulation time. This case was chosen to represent the most difficult flow of a realistic car application, i.e. high temperatures and low convective velocities. The comparisons shown here demonstrate the ability of the underlying numerical method to accurately predict the flow structures and the applicability to geometrically more complex cases is expected. Furthermore, a coupled flow simulation with a radiation/conduction tool is also being developed in order to predict both the flow and surface temperature distributions simultaneously.


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    Title :

    Lattice Boltzmann thermal flow simulation and measurements of a modified SAE model with heated plug


    Additional title:

    Simulation der Lattice-Boltzmann-Wärmeströmung und Messung eines modifizierten SAE-Modells mit erwärmtem Verschlussstopfen


    Contributors:


    Publication date :

    2006


    Size :

    10 Seiten, 22 Bilder, 50 Quellen



    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English





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