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Combustion Analysis

Combustion Analysis is at the core of what our CFD consulting engineers do at our CFD consultancy offices in BroadTech Engineering Singapore.

Featured Combustion Analysis Case Studies

 Combustion Analysis

CFD Simulation of Inerting Gas for Fire Suppression 

CFD Simulation approach for fire suppression system for A350-1000 lower deck cargo compartment (aft cargo).
Simulation Objective: Objective of the combustion modeling project was to replicate the ANSYS FLUENT species modeling (used for fire suppression) for transient, turbulent flow into Star CCM+, (for A350-1000, lower deck cargo compartment).
The fluid flow analysis project has been carried out in two phases.
– In phase 1: ANSYS FLUENT mesh has been imported in Star CCM+ to
replicate the FLUENT methodology.
– In phase2: CAD geometry has been imported in Star CCM + to generated the mesh in Star CCM+ to replicate the computational fluid dynamics simulation methodology.
In case of fire, inerting gas is being supplied (varying with time) from two HR (high rated) bottles for initial (0 to 120 sec) period of time. Various mesh density boxes have been used to capture the flow properly. It was a non-reacting multi-component gas simulation and SST k-omega turbulence model has been considered for the computational fluid analysis of the problem.
Methodology Approach Adopted:
The fluent methodology has been replicated successfully into Star CCM+, and a template has been prepared as a model reference for implementing of future CFD services.
Challenges:
– Understanding the multicomponent reactive system when carrying out the fluid dynamic analysis.
– Exploring species modeling in FLUENT thoroughly, and how to hook boundary profiles, how to tackle the transient problem. And also, how to run a simulation from the specific time period (not from zero).
– Achieving all the above steps in Star CCM+, this is completely different from the FLUENT.
– Writing a macro to run the fluid dynamic simulation satisfying all other defined constraints.
 Importing the CAD geometry, and identifying the different components (like a smoke detector, nozzle inlets, door, lateral inlets, door net etc.) and labeling them accordingly.
– Generating fluid flow simulation mesh (multi-region) in Star CCM+ with all mesh refinements, boundary layers according to the domain requirement and best practice.

Transient Enclosed Pool Fire Simulation

Validation of developed Pool Fire CFD model in OpenFOAM
Objective: The 1 m diameter methane fire scenario tested by experimentalist is chosen in this section. The combustion analysis experiments were performed in a large building at Sandia Laboratory in the USA, which is nominally a 6.1 m cube with a one-meter diameter burner located near the center of the facility, 2.45 m above the floor.
Methodology:
Mesh: Structured Mesh developed in BlockMesh utility in OpenFOAM.
A cylindrical computational domain was adopted with 2 m in diameter and 4.5 m in height. Three different sizes were applied to check the grid sensitivity.
Modeling:
Fuel Methane
Smoke Point Height 0.29 m, Fire Size 1 m
Mass Flow Rate 0.0519 kg/s
Theoretical HRR 2.59 MW
Inlet Temperature Fixed Enthalpy Flux
Computational Domain: 2 m (D) × 4.5 m (H)
Mesh: Non-uniform grids
Cells across burner: Coarse, 18; Medium, 36; Fine, 72
LES Model
The sub-grid kinetic energy equation
A radiation Model Optically thin assumption
Soot Model On
Prandtl Number 0.8, Lewis Number 1.0
Integral Length Scale 1.4 m, Physical Time 30 s
Outcome:
The combustion analysis results were compared with the experiment. The grid sensitivity was analyzed with famous McCaffrey correlation by plotting velocity and temperature across the centerline of the fire domain.
The velocity, temperature, turbulent stress and turbulent kinetic energy were also plotted at different heights to validate with the experiments.
CFD predictions were in agreement with the experiments.

CFD Analysis of Combustion Phenomena inside a Cylindrical Combustor

CFD computational fluid dynamics analysis of combustion phenomena inside a cylindrical combustor for a steady, turbulent flow.
Project Objective: Objective of the project was to study the effect of the reactant on combustion and effect of change of property definition model.
Challenges:
– Studying the basics of combustion and various terminology used.
– Modeling the geometry.
– Generating the mesh and performing the grid independence analysis.
– Physics definition (setup).

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If you are still interested in learning more about our combustion analysis services or our fire dynamics simulation to see what it can do for you, call to contact us today at +6581822236 for a no obligation discussion of your needs.
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