" Compitational Fluid Flow Dynamic Analysis on I.C Engine using ANSYS"

CFD analysis is plays a important role in an structure safety of the component in automobile and aerospace applications. Simulation of IC engine is the most important engineering problems in the computational fluid dynamics field. In the present work, simulation of inlet, compression, expansion and exhaust processes will be carried out without considering fuel combustion when a piston moves from TDC and also size of the domain vary during the valve opening and closing, then the mesh well be provided for optimization in a structure to simulate in a stable dynamic conditions throughout a complete cycle. For 3-D analysis in CFD industrial standard codes are used called RANS. The turbulence model used in the analysis is k-ε which is commonly used in a industries that in turns the best model between precision and computational time. The geometric model and mesh (grid) is developed by using ANSYS with the help of ICEM-CFD command. This CFD domain shows that the whole experimental setup is on acoustic phenomena. Keywords—CFD; Turbulence model k-ε; ICEM-CFD; ANSYS; I.C engine.


INTRODUCTION
CFD analysis is plays a important role in an structure safety of the component in automobile and aerospace applications. Simulation of IC engine is the most important engineering problems in the computational fluid dynamics field. In the present work, simulation of inlet, compression, expansion and exhaust processes will be carried out without considering fuel combustion when a piston moves from TDC and also size of the domain vary during the valve opening and closing, then the mesh well be provided for optimization in a structure to simulate in a stable dynamic conditions throughout a complete cycle.
The details of three-dimensional modeling on reciprocating engine geometry of flat cylinder head and a bowl-in-piston combustion chamber, simulating on non-firing conditions [1]. They were compared on flow characteristics inside the engine cylinder with different piston configurations; the bowl shaped piston plays a significant role near TDC [2]. They were studied the swirl motion in the cylinder during the intake and compression strokes [3]. Performance of full intake and compression processes and presented some comparisons with experimental data and theoretical Data, their results are predicted the turbulence velocity is differing with standard k-ɛ model [4]- [5]. Review on computations based and LES, then concludes that this method has largest potential [6]. Method for calculating the 3D flow-fields in reciprocating I.C engines, as a function of space and time, throughout the complete four stroke cycle by using governing equations [7].

A. Objectives
 Simulation of inlet, compression, expansion and exhaust processes will be carried out without considering fuel combustion.  The turbulence model used in the analysis is k-ε which is commonly used in a industries that in turns the best model between precision and computational time.
 Distribution of temperature, pressure and velocity will be analyzed with varying crank angle.

B. Methodology
 Problem is defined through literature survey  Solid modeling and meshing of inlet manifold and geometry of cylinder with one valve using ANSYS.  Generating grids, with approximate boundary conditions i.e., industrial standard codes are used as RANS and K - model.  Flow takes place in intake valve and engine cylinder will be simulated to study the variation of pressure velocity, temperature, at different crank angle using ICEM-CFD.  Finally simulated results were compared with the actual results.

C. Assumption
 Ideal gas is used as working fluid.  The simulation model is considered as flat piston.  In a simulation only one valve is used for inlet and exhaust process.  Assume that the valve will be start to open at 0 0 and closes at 180 0 during suction stroke and also valve will be start to open during exhaust stroke at 540 0 to 720 0 .  Adiabatic and isentropic process is considered for compression and expansion. shows the split blocks, discard unused blocks are created to capture underlying shape and the Associate edges to curves so that it capture hard features, vertices is move to position block corners on geometry.

D. Model
Further boundary conditions are applied based on valve position as follows  Inlet BC (subsonic, Mach number less than 1)  Outlet BC (supersonic, Mach number greater than 1)  Wall BC (adiabatic)

b) Temperature Distribution
Temperature distribution at different crank angle to evaluate various ideal combustion of mass flow rate in I.C engine.

c) Pressure Distribution
Pressure distribution at different crank angle to evaluate various ideal combustion pressure in I.C engine.     C. Discussion

IV. CONCLUSION
The present scope of work, development flow visualization setup for overcoming the difficulties fluid flow in I.C engines with different case as like velocity, temperature and pressure boundary conditions in experimental setup and also concerned with studies aimed at understanding type of flows in cylinder. The results obtained from the experiments and theoretical values are found to be in close agreement with the CFD results using k-ε turbulent model. Further, feature scope k-ε model is replaced with k- turbulent model validation qualifies the usage of the k- model as the effective turbulent scheme in the CFD model for the further heat transfer studies carried out in these geometries.