Eventos Anais de eventos
ENCIT 2016
16th Brazilian Congress of Thermal Sciences and Engineering
ASSESSMEMNT OF TWO DISCRETIZATION STRATEGIES TO SIMULATE THE COMPRESSION CYCLE OF RECIPROCATING COMPRESSORS
Submission Author:
Leíza Reis da Silva , SC , Brazil
Co-Authors:
Evandro Luiz Lange Pereira, Tadeu Tonheiro Rodrigues, Cesar Deschamps
Presenter: Leíza Reis da Silva
doi://10.26678/ABCM.ENCIT2016.CIT2016-0250
Abstract
CFD models have been widely employed to predict fluid flow and heat transfer inside the compression chamber of reciprocating compressors due to the importance of such phenomena in the compressor efficiency. This paper presents a comparative analysis between two different discretization approaches to simulate the compression cycle, a Dynamic Mesh (DM) and an Automatic Mesh Refinement (AMR). The simulation model adopts a transient three-dimensional formulation and considers a moving piston with specified displacement and ideal automatic valves for the suction and discharge processes. In the DM model the volumes are stretched or compressed during the piston displacement, always maintaining the same number of total volumes. On the other hand, the mesh in the AMR model is generated for each position of the piston and new volumes can be created according to specified parameters. Despite the much larger use of RAM memory by the AMR model, its computational cost was found to be significantly smaller than that of the DM model.
Keywords
Compression Cycle, Dynamic Mesh, Automatic Mesh Refinement
