Abstract
This paper is discussing about 1D-3D coupling CFD applies to engine cooling closed water flow system to evaluate its flow distribution and optimize coolant looping. Recently, the automotive CFD application is expanding to wider and huger systems with rapid growth of computation software and hardware. With such requirements for comparable huge CFD computation, the multi-dimensional CFD approach is often used. The multi-dimensional CFD approach is consisted with the coupling of CFD softwares which have each different spatial dimension. This approach can be performed computations for spatially huge scale problem within limited low cost. Especially, multi-dimensional approach is desired by automotive design engineers to compute whole closed loop flow such as shown in this paper. The past CFD evaluation for large system closed loop flow have been performed as separated simulation of each component in the loop. However, such separated computations have some difficulties to determine computational boundary conditions which have physical consistency, because of flow loop is completely closed. Thus, whole of flow system computation with multi-dimensional CFD approach is desirable. This paper describes the some accuracy problems to mapping higher order spatial dimensional result to lower spatial dimension and solve such problem using newly data exchange method between 1D and 3D system. The newly data exchange method which is named 'inlet length model' can be used to hold threedimensional feature in exchanged data with high efficiency and also can be applied to general CFD codes.
Keywords:Computational Fluid Dynamics, Multi-Dimensional Simulation, Thermal Management, Coolant Flow