Solução numérica de um escoamento bidimensional entre placas paralelas com obstáculo

Abstract

The study of heat transfer mechanisms are fundamental for the operation of machines, engines and applications in the engineering area. For example, in the case of a radiator, the heat exchange process is related to flow between parallel plates. In this context, the use of Computational Fluid Mechanics for the study of a heat exchanger design becomes a tool with low financial cost when compared to experimental studies. The present work proposes a numerical solution of a flow between parallel plates with different geometric obstacles. The main objective is to validate a numerical code that will serve as a basis for future developments of heat transfer models (heat exchangers). In this sense, the finite volume method is used for the discretization of the equations for an incompressible flow. The pressure and velocity coupling is obtained through the method of artificial compressibility, where the density is artificially replaced by the pressure in the transient term of the continuity equation. The solution is obtained by the Quick Scheme method. In this stage of the work, a classical solution of flow between two parallel plates with a cylindrical obstacle in the center of the domain and also free flow with square obstacles is presented. The results show that the model reproduces the von Kármán wake, which is a classic phenomenon in flow around cylinders. Therefore, the model can be adapted for future modeling of heat exchangers. Keywords: Artificial Compressibility, Heat Exchanger, Quick Scheme, Finite Volume.