ANSYS Internal Combustion Engines Tutorial Guide

Tutorial: Solving a Cold Flow Simulation
A three dimensional single cylinder CFD simulation of a 4-stroke engine is performed under motored
conditions (cold flow) in this tutorial. Detailed boundary conditions are shown in
Figure 1.1: Problem
Schematic (p. 1)
. Engine simulation is started from Intake valve opening (IVO) followed by air flow
during intake stroke. Air is compressed as piston moves towards top dead centre (TDC). This is followed
by expansion of air as piston moves towards bottom Dead centre (BDC). This tutorial serves as an introduction in releasing the streamlined workflow between pre-processing, solver and post processing while
carrying out simulations with Fluent.

Tutorial: Solving a Port Flow Simulation
In this tutorial of port flow analysis, you will measure mass and angular momentum flux (swirl and
tumble) for given cylinder head and intake port design over varying valve lifts of 2mm, 6mm and 10mm.
You will create swirl monitor planes at 30 mm, 45 mm, and 60 mm below the cylinder head. The inlet,
outlet and wall boundary conditions are as shown in the
Figure 2.1: Problem Schematic (p. 63). Initial
conditions are pressure 101325 Pa and temperature 300 K. The tutorial illustrates the following steps
in setting up and solving a port flow simulation of an IC engine.

Tutorial: Solving a Combustion Simulation for a Sector
In this tutorial a complete Direct injection (DI) compression ignition (CI) engine geometry is transformed
into 60° sector in-order to reduce mesh size and solution time. Detailed boundary conditions are as
shown in the
Figure 3.1: Problem Schematic (p. 107). Sector simulation is started at intake valve Closing
(IVC) with initial conditions as 3.45 bar and 404 K, species mass fraction of O2=0.1369, N2=0.7473,
CO2=0.0789, H2O=0.0369. n-heptane (nc7h16) is used as surrogate for diesel fuel and is injected 8 degrees
before compression (Top Dead Centre). Engine rpm is increased from 1500 rpm to 2000 rpm and its
effect on unburnt fuel is examined. This tutorial illustrates the following steps in setting up and solving
a combustion simulation for a sector.

Tutorial: Solving a Gasoline Direct Injection Engine Simulation
A three dimensional single cylinder CFD simulation, of a 4-stroke spray guided Gasoline Direct Injection
(GDI) Spark Ignition (SI) engine, is performed in this tutorial. Detailed boundary conditions are shown
in Figure 4.1: Problem Schematic (p. 173). Engine simulation is started from Intake valve opening (IVO)
and fuel is injected during the intake stroke. Homogeneous fuel air mixture is compressed and spark
ignited 15° before compression Top Dead Center (TDC).

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