ANALYSIS OF COLD FLOW IN INTERNAL COMBUSTION ENGINES BY USING DYNAMIC MESH AND CHANGING TOPOLOGY

In this article turbulent flow in a cycle of internal combustion engine has been analyzed by OpenFOAM software that the cycle consists of: suction،compression،expansion and exhaust. A two dimensional geometry has been used and moving boundries in valves and piston has been simulated by using the dynamic mesh. Three types of changing topology have been used that they consists of add or removal layers of cells for simulation of moving piston and sliding mesh for simulation of valves and attach or detach boundries for simulation of intake and exhaust ports. The k- standard model has been used for the turbulent flow and the Problem has been solved for two rotational speed 1500 and 3000 respectively. The contours of pressure and vector plots of velocity is showed. Asymmetry of flow in exhaust port at the end of the cycle is evident. Also swirl increases due to increasing of rotational speed. Using the dynamic mesh has caused achieving of flow’s details. So the numerical simulation could replace the difficult experimental methods.