Gökhan Sevilgen

Evaluation of Heat Transfer Characteristics in an Automobile Cabin with a Virtual Manikin During Heating Period

In this study, a three-dimensional transient numerical analysis was performed inside the automobile cabin during heating period. A three-dimensional vehicle cabin including glazing surfaces was modeled by using the real dimensions of a car. A virtual manikin with real dimensions and physiological shape was added to the model of the vehicle cabin. It was assumed that the manikin surfaces were subjected to either constant heat flux or constant temperature. Three-dimensional fluid flow, temperature distribution, and heat transfer characteristics inside the cabin were calculated. Experimental measurements were also conducted. Comparisons of the results were presented and discussed. The results of numerical calculations were in good agreement with the experimental and theoretical data in the literature.

Transient numerical analysis of airflow and heat transfer in a vehicle cabin during heating period

This paper describes a three-dimensional transient numerical analysis to determine the airflow and heat transfer characteristics inside the vehicle cabin during a heating period. A three-dimensional vehicle cabin including glazed surfaces and pertinent physical and thermal properties of the enclosure was modelled by using the real dimensions of a car. A virtual manikin was added to the model of the vehicle cabin to determine the heat transfer between the human body and the vehicle cabin ambient. The analysis takes into account all the possible thermal load of the cabin. Governing equations were solved by an implicit, time marching finite volume numerical scheme under varying inlet boundary conditions of the vehicle air conditioning system. The results of numerical calculations were in good agreement with the available experimental and theoretical data in the literature.

Evaluation of windshield defogging process in an automobile

The defogging process on a windshield is one of the important concerns in the automotive industry for driver safety and certification. Therefore, the simulation of the windshield defogging process provides a very effective and useful tool for the designers to obtain a more efficient and rapid defogging process. In this paper, an experimental and numerical study is presented for the windshield defogging process of an automobile. A computational fluid dynamics (CFDs) tool was used to perform the relevant three dimensional (3-D) transient simulations. Both droplet and wall film models are employed for comparison of the demisted area on a windshield in the numerical calculations. The 3-D fluid flow, temperature distribution and heat transfer characteristics of the interior surfaces of the automobile cabin are also considered. It is shown that the results of the simulations are in a good agreement with the experimental data presented in this study.

Hot stamping applications in the automotive industry: coupled numerical simulation and FE-based die design

Hot stamping is an alternative production method for forming of ultra-high strength sheet metals. It consists of heating the sheet metal and directly transfers to the die through the forming and cooling steps. Today, there is an increasing trend to use the hot stamping process to manufacture vehicle parts owing to body structure regarding vehicle safety and emission requirements. The aim of this study is to present a numerical simulation approach, which is FE-based die design for hot stamping with a thermo-mechanical-metallurgical coupled model. The results and validity of this approach are illustrated through an industrial application for an automotive part. The results are also evaluated by considering hot stamping applications research in literature, and 2D and 3D results show a good agreement with results known from literature.

Three-Dimensional Numerical Analysis of Thermal Output of a Steel Panel Radiator

Nowadays, new developments in the properties of insulation materials used in buildings and international regulations lead to the use of more efficient heating systems. On the other hand, the increased energy efficiency of modern buildings makes necessary the use of low-temperature heating systems. Thus, we need to design a new generation of energy-efficient radiators which have a low capacity of water volume and low weight compared to conventional radiators. Moreover, the standards defined for the testing procedures of the thermal output of steel panel radiators have been changed depending on the objectives of energy efficiency. In this context, a detailed thermal analysis of a panel radiator should be performed to meet the needs for these objectives. Three-dimensional computational fluid dynamics (CFD) is a useful tool for the thermal analysis of a steel panel radiator. In this study, three-dimensional numerical calculations of the thermal output of a steel panel radiator, in accordance with TS EN442, was performed by using CFD analysis based on the finite volume method. The numerical calculations were performed under steady-state conditions. The results obtained from the numerical simulations were in good agreement with the experimental data available in the literature.