Manifold of Engine CFD Simulation by Species Transport, ANSYS Fluent

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In this project, steady air flow mixing with fuel is investigated in an engine manifold with 3 outlets, where only one outlet is open and the other 2 outlets are blocked.

This product includes Mesh file and a Training Movie.

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Engine Manifold Problem description

In this project, steady air flow mixing with fuel is investigated in a 3-outlet manifold where only one outlet is effective and other 2 outlets are blocked. There are two inlets which provide air and fuel flow into the domain. Air and fuel flow rates are equal to 0.2335 and 0.0374 kg/s. Species entering the domain via air inlet are nitrogen and oxygen with mass fractions equal to 0.79 and 0.21, respectively. Species entering the domain via fuel inlet are CO, CH4, CO2, N2 and H2 with mass fractions equal to 0.06, 0.004, 0.1, 0.081 and 0.03 respectively.

Engine Manifold Geometry and mesh

Geometry of fluid domain is designed in Design modeler and computational grid is generated using ANSYS Meshing. Mesh type is unstructured and element number is 231646.


Solver configuration

Critical assumptions:

  • Solver type is assumed Pressure Based.
  • Time formulation is assumed Steady.
  • Gravity effects is neglected.

The following table a summary of the defining steps of the problem and its solution.

Models (Engine Manifold)
Energy On
Viscous K-epsilon model Standard
Near wall treatment Enhanced wall treatment
Species transport Model Species transport
Options Inlet diffusion (on)
Diffusion energy source (on)
Mixture properties Mixture-template
Materials (Engine Manifold)
Fluid Definition method Fluent Database
Material name CO2
Material name CO
Material name H2
Material name CH4
Material name N2
Material name O2
Material name H2O
Boundary conditions (Engine Manifold)
Inlet_air Type Mass flow inlet
Mass flow rate 0.2335 kg/s
Turbulent intensity 4%
Hydraulic diameter 0.05 m
Species N2 (0.79)
O2 (0.21)
Inlet_fuel Type Mass flow inlet
Mass flow rate 0. 0374 kg/s
Turbulent intensity 5%
Hydraulic diameter 1 m
Species N2 (0.801)
CO (0.06)
CH4 (0.004)
CO2 (0.1)
H2 (0.03)
Solver configurations (Engine Manifold)
Pressure-velocity coupling Scheme PISO
Spatial discretization Gradient Least square cell-based
Pressure Standard
Momentum Second order Upwind
K First order Upwind
Epsilon First order Upwind

Results and discussion

Mixture mass flow rate at outlet is equal to 0.2709012 kg/s. Although 2 outlets are considered as walls and are blocked, mixture pressure on these surfaces are of critical importance. Pressure on outlet 1 and 2 is equal to 771.44639 and 780.98142 Pa, respectively.

There is a mesh file in this product. By the way, the Training File presents how to solve the problem and extract all desired results.


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