# Manifold of Engine CFD Simulation by Species Transport

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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.

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## Manifold of Engine CFD Simulation Problem Description

In this project, steady air flow mixing with fuel is investigated by ANSYS Fluent in a 3-outlet manifold where only one outlet is adequate, and the other 2 outlets are blocked. Two inlets 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

The geometry of the fluid domain is designed in the Design Modeler, and the computational grid is generated using ANSYS Meshing. The mesh type is unstructured, and the element number is 231646.

## Solver configuration

Critical assumptions:

• The solver type is assumed Pressure Based.
• Time formulation is assumed to be Steady.
• Gravity effects are neglected.

The following table summarizes 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) The 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

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

## Reviews

1. Hallie Mitchell

Can this simulation be extended to model other types of manifolds?

• MR CFD Support

While the current simulation focuses on an engine manifold, it can be extended to model other types of manifolds. We are open to contributions and can customize the simulation to accommodate your specific needs.

2. Prof. Jorge Lindgren V

Can the simulation model the effects of different fuel types on the engine manifold performance?

• MR CFD Support

Yes, the simulation can model the effects of different fuel types on the engine manifold performance. This allows for a comprehensive analysis of manifold performance for different fuel types.

3. Bradley Christiansen

How computationally intensive is this simulation?

• MR CFD Support

The computational intensity of the simulation depends on several factors, including the complexity of the geometry, the number of cells in the mesh, and the complexity of the species transport and reaction models. However, ANSYS Fluent is highly optimized for CFD simulations and can efficiently handle large, complex simulations.

4. Javon Crist

How accurate is the simulation in predicting the engine manifold performance?

• MR CFD Support

The simulation uses advanced models for turbulence, multiphase flow, and species transport, which allows it to accurately predict the engine manifold performance.

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