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Computer modeling at Coen Company is performed using a variety of platforms
and a variety of analytical tools. Over the years, the R&D Staff has
developed a number of specialized codes for analyzing specific combustion
applications. Coen R&D also uses Computational Fluid Dynamics, or
CFD, to perform evaluations of Coen products and the applications in which
they are installed.
Examples of Computer Modeling
The following cases are examples of some typical uses of CFD. A brief description of the features of each model is
available, or you can go directly to the individual examples by clicking
on the links below.
Computational Fluid Dynamics
Computational Fluid Dynamics, or CFD, is a complex technique for determining
the equilibrium state of a region of fluid flow. The technique works by
breaking the geometrical volume of the flow into a large quantity of discrete
volumes, called cells. For each one of these cells, the complete set of
fluid dynamic equations are solved, including mass balance, momentum balance,
energy balance, and chemical reactions rates. Using numerical solving
techniques, this large set of simultaneous equations are solved in an
iterative process. It is not unusual for these equations to number in
the millions.
Coen uses a CFD code developed by Fluent
Inc. to perform all of its CFD analyses. Since 1986, the Coen R&D
Department has used this code to analyze and optimize burner design. This
software package was selected because it provides a wide range of physical
models and development tools for the simulation of combustion processes.
In its current release, the Fluent package offers both structured and
unstructured solvers, mesh development tools, and post-processing for
displaying results. Its general-purpose approach affords enough versatility
to be used for air flow modeling, heat transfer modeling, and combustion
modeling. Some of the features Fluent offers include the following:
- Choice of 2D or 3D grids
- Choice of structured or unstructured grids
- Mixed cell types/shapes
- Adaptive grid refinement
- Choice of turbulence models (laminar, k-e,
RNG k-e)
- Variable fluid properties
- Buoyancy and free convection
- Heat transfer with interaction between gas, liquid, and solid phases
- Choice of radiation models (DTRM, P-1, Rosseland)
- Choice of reacting or non-reacting chemistry
- Choice of combustion models (finite rate chemistry, mixture fraction
PDF approach)
- Discrete phase models for liquid droplet or solid particle injection
- Post-processor for NOx prediction
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